GreyMatters
Educational articles, BetterBrain resources, latest in brain health, and news about us. Written for you, with expertise (and love).
An 11-country trial tested brain health advice against structured support
The same brain health advice produced very different results
Most people already know the broad advice for protecting their brain. Exercise regularly. Eat well. Manage blood pressure and blood sugar. Stay socially and mentally engaged. Get enough sleep.
The harder part is following through consistently, especially when work gets busy, routines change, motivation fades, or the original plan does not fit your life very well.
A two-year randomized trial across eleven Latin American countries has now put a number on how much that harder part is worth. Both groups worked on the same broad areas of brain health. One group received ongoing coaching, supervision, and regular group meetings. The other received health education and general recommendations. After two years, the structured group showed 55 percent greater improvement in overall memory, thinking, and reasoning.
The trial, called LatAm-FINGERS, was published in The Lancet and presented at the Alzheimer's Association International Conference.
What the trial tested
The study included 1,065 older adults who were at elevated risk of cognitive decline but did not have dementia. It ran across twelve sites in eleven countries and followed participants for two years.
Both groups worked on the same broad areas of brain health, including physical activity, nutrition, cognitive training, social engagement, and management of cardiovascular risk. The difference was the amount of structure surrounding the work.
The flexible group, 526 participants, attended four meetings over two years. They received health education and general recommendations, but no ongoing coaching or supervision.
The structured group, 539 participants, received supervised exercise, nutrition counseling, cognitive training, cardiovascular risk monitoring, ongoing coaching, and 38 group meetings that provided social connection and accountability.
In other words, the trial was not testing whether lifestyle matters for the brain. That question has been asked before. It was testing how much the way a program is delivered can change the results it produces.
What happened
After two years, the structured group showed 55 percent greater improvement in overall memory, thinking, and reasoning than the more flexible group. They also had greater improvements in executive function and processing speed.
Both groups were working on their brain health, and both improved. The structured group simply improved much more.
That makes the finding more interesting than a comparison between doing something and doing nothing. The broad recommendations were similar. What changed was the frequency of contact, the level of supervision, and the support participants received while putting those recommendations into practice.
Because participants were randomly assigned to the two groups, differences in motivation or baseline health are less likely to explain the result. The structured program itself appears to have contributed to the additional cognitive improvement.
Heather Snyder of the Alzheimer's Association, commenting on the results at the conference, put it simply: "A key message from this study is that structure and social support matter."
The finding builds on the original FINGER trial in Finland, which found that a multidomain lifestyle program could help protect cognitive function in older adults at risk of decline. LatAm-FINGERS took that model and adapted it to local cultures, diets, and habits rather than importing it unchanged, which matters for anyone wondering whether these programs travel.
Read the full LatAm-FINGERS study
What structured support actually does
A brain health plan can look simple on paper and still be difficult to carry out.
A person may leave an appointment intending to exercise four times a week, improve their sleep, change their diet, take several supplements, and reduce stress. Every recommendation may be reasonable. The problem is that seven reasonable priorities are still seven priorities competing with the rest of life.
A few weeks later, the easiest habits are sometimes still happening. The more inconvenient ones have started to disappear, which is where structured support comes into play. It creates a regular opportunity to review what happened, understand why something did not work, and adjust the action plan before one missed week becomes a habit that has quietly been abandoned.
Sometimes the person needs accountability. Sometimes the goal was too ambitious. Sometimes the recommendation needs to change because of travel, an injury, family responsibilities, or a demanding period at work.
The goal is not to follow the original plan perfectly. It is to keep adjusting the plan until it works in real life.
The question the study leaves open
LatAm-FINGERS compared a structured, intensive program with a more flexible, self-guided version focused on the same broad areas of brain health. It did not test whether a personalized action plan works better than a generic one. That is a separate question, and an important one.
Two people can receive the same list of brain health recommendations and have very different needs. One person may need to focus on blood pressure. Another may need to address poor sleep, low cardiovascular fitness, insulin resistance, or a nutritional deficiency first. The markers that shape brain health sit across sleep, metabolic health, cardiovascular health, inflammation, and nutrition, and they do not line up the same way in any two people.
A useful brain health system needs to answer two questions. What matters most for this person, and what will help them keep doing it?
Personalization helps determine the priorities. Structure helps turn those priorities into sustained action.
How BetterBrain approaches both
BetterBrain is one connected system that brings together brain-relevant health information, a personalized action plan, and continued support.
There are two ways to start.
Some people begin with Blueprint, which uses more than 50 brain-relevant biomarkers, cognitive testing, health history, and lifestyle information to identify the areas that matter most for their brain health, with a nurse coach to walk through what the results mean. Instead of receiving a broad list of everything they could improve, they get a personalized action plan ranked by impact.
Others begin with the Coaching Program, where a dedicated brain health coach helps build the action plan, checks in on progress, and adjusts it when life gets in the way. Coaching is often fully covered by insurance, and many commercially insured clients pay nothing out of pocket.
Both starting points lead toward the same goal: a smaller set of meaningful priorities, a realistic action plan, and enough continued support for that plan to last.
The bottom line
The LatAm-FINGERS trial moves the brain health conversation beyond whether lifestyle matters. It shows that the way lifestyle guidance is delivered can meaningfully change the outcome.
Advice alone leaves people responsible for setting priorities, creating a schedule, tracking progress, solving barriers, and knowing when to adjust the plan. A better delivery system does those things with them. It provides clear priorities, regular contact, accountability, opportunities to review progress, and a way to adapt when the original plan stops working. That support helps healthy actions continue long enough to produce meaningful results.
Personalization helps you choose the right actions. Structure helps you keep doing them.
Grey Matters: our CSO Tommy Wood on Huberman, and how to stay sharp
Our Chief Science Officer, Dr. Tommy Wood, joined Andrew Huberman on the Huberman Lab podcast to talk about how to keep learning and stay sharp at any age.
The episode, titled Accelerate Learning & Increase Cognitive Capacity, is incredibly informative, and we're excited to share our main takeaways. If you only take one thing away, make it this: your brain keeps adapting to whatever you ask of it, at 40 and at 75, and everything below is a way of asking a little more.
Plus two big updates from BetterBrain below!
Content Corner
Aging itself is not the driver of decline. Your brain keeps what you use and prunes what you stop using, so much of what we call decline comes from no longer giving the brain new, challenging inputs. Encouragingly, mental processing speed tends to hold steady until around 60.
Do things that are new, hard, and ideally social. Crosswords and sudoku are more relaxing than challenging. To actually build capacity, pick something that stretches you and mixes movement, thinking, and other people. Dancing has the best evidence, ballroom and square dancing especially, followed by ball sports, martial arts, and learning a language. Part of the trick is getting comfortable being a beginner, because the discomfort of making mistakes is what drives the learning.
You do not need to be in flow. Real learning, and even peak performance, often happens in what athletes call a clutch state, where it still feels like hard work. Do it in focused blocks, since hard mental work is really only sustainable in 20 to 30 minute chunks, and protect them from distraction. Even a phone in the room carries a cost.
Exercise is two brain tools in one. A short 20 to 30 minute jog or strength session right before mental work sharpens learning in the moment. Over time, harder aerobic work like intervals builds the hippocampus and memory, while resistance training builds the brain's white matter and decision-making. Do both.
Feed the brain, then test rather than guess. Whole-food patterns like the Mediterranean and MIND diets have the best evidence, and it is overall quality, not any single food, that matters. For supplements, Tommy's advice is to test your levels rather than guess, because the standard normal range is not the same as the optimal one. His clearest example: omega-3 and B vitamins only work when you have both, which is exactly why we measure homocysteine and other brain-specific biomarkers in Blueprint rather than blanket-recommend. Creatine and a basic omega-3 and B-vitamin stack have modest, real support, and our picks like Advanced DHA, Thorne Creatine, and MethylAssist are all in the Picks library.
Some of the biggest protections are indirect. Blood pressure, cholesterol, hearing, and metabolic health all shape long-term brain health, and avoiding serious illness matters because cognition tends to step down after a big sickness. One finding worth watching: the shingles vaccine has been linked to lower dementia risk across several large studies.
If you want to go deeper
Tommy also just published a book: The Stimulated Mind: Future-Proof Your Brain from Dementia and Stay Sharp at Any Age. It covers the same ground as the episode in more depth, built around his 3-S model of challenging the brain, feeding it, and letting it recover.
What's New at BetterBrain
HSA/FSA savings and Referral code benefits
Two exciting updates this week!
We've just launched a new referral system that benefits both you and whoever you're referring, which makes improving brain health even more accessible for you and your loved ones. Now, when you refer a friend or loved one, they will get Blueprint Essential Labs, 50+ biomarkers, for just $39, and once they sign up you will get a $50 credit toward your next Picks order.
As a reminder, Picks is our curated marketplace for all your brain health needs including science-backed supplements, tools, and services. Your personal referral link lives in your BetterBrain dashboard, with more details on how to share your code.
We're also happy to announce thatBetterBrain Picks is now HSA/FSA eligible. We partnered with TrueMed to handle the medical-necessity review, which means you can finally put pre-tax dollars toward the supplements on your plan. That is roughly 30% or more in effective savings, your 15% subscription discount still applies on top, and one approval covers a full year of purchases. Very few supplement companies can offer this. Details are on the HSA/FSA page.
How to Keep Your Brain Sharp at Any Age: 6 Lessons From Dr. Tommy Wood on Huberman Lab
Our Chief Science Officer, Dr. Tommy Wood, joined Andrew Huberman on the Huberman Lab podcast for a nearly three-hour conversation titled "Accelerate Learning & Increase Cognitive Capacity." His core message: your brain keeps adapting to whatever you ask of it, at 40 and at 75. Staying sharp is less about your age and more about whether you keep giving your brain new, challenging inputs, move your body before and around mental work, eat a high-quality overall diet, and test your biomarkers instead of guessing at supplements.
Here are the six takeaways we think are most worth acting on, plus where to start if you want to put them into practice.
Does aging itself cause cognitive decline?
Not in the way most people assume. According to Wood, aging itself is not the primary driver of decline. Your brain keeps the capacities you use and prunes the ones you stop using, so much of what we call age-related decline comes from no longer giving the brain new, challenging inputs. Encouragingly, he notes that mental processing speed tends to hold steady until around age 60.
That reframing matters. If decline is largely about disuse rather than age, then the inputs you choose, at any age, are levers you control.
What activities actually keep your brain sharp?
The activities that build cognitive capacity share three traits: they are new, hard, and ideally social.
Crosswords and sudoku, Wood points out, are more relaxing than challenging. They exercise skills you already have. To actually build capacity, pick something that stretches you and mixes movement, thinking, and other people:
- Dancing has the best evidence, ballroom and square dancing especially
- Ball sports and martial arts
- Learning a language
Part of the trick is getting comfortable being a beginner. The discomfort of making mistakes is not a sign you picked the wrong activity. It is what drives the learning.
Do you need to be in a flow state to learn?
No. Real learning, and even peak performance, often happens in what athletes call a clutch state, where the work still feels like hard work.
What matters more is structure. Hard mental work is really only sustainable in 20 to 30 minute focused blocks, so work in chunks and protect them from distraction. Even having a phone in the room carries a cost to focus.
How does exercise improve learning and memory?
Wood describes exercise as two brain tools in one:
- In the moment: a short 20 to 30 minute jog or strength session right before mental work sharpens learning during that session.
- Over time: harder aerobic work, like intervals, builds the hippocampus and supports memory, while resistance training builds the brain's white matter and supports decision-making.
The practical answer to "cardio or weights for brain health?" is both, and if you can, schedule some of it right before your most demanding mental work.
What should you eat, and should you take supplements?
On diet, whole-food patterns like the Mediterranean and MIND diets have the best evidence, and it is overall diet quality, not any single food, that matters.
On supplements, Wood's advice is to test your levels rather than guess, because the standard "normal" lab range is not the same as the optimal one. His clearest example: omega-3 and B vitamins only work when you have both. That interdependence is exactly why we measure homocysteine and other brain-specific biomarkers in Blueprint rather than blanket-recommending a supplement stack.
For supplements with modest, real support, he points to creatine and a basic omega-3 plus B-vitamin stack. Our picks in those categories, including Advanced DHA, Thorne Creatine, and MethylAssist, are all in the Picks library, and Picks is now HSA/FSA eligible through our partnership with TrueMed.
What else protects long-term brain health?
Some of the biggest protections are indirect. Blood pressure, cholesterol, hearing, and metabolic health all shape long-term brain health. Avoiding serious illness matters too, because cognition tends to step down after a major sickness rather than declining smoothly.
One finding Wood flags as worth watching: the shingles vaccine has been associated with lower dementia risk across several large studies.
Where to start
You do not need a perfect routine or new technology. The conversation points to a short list: work on something hard and a little new, move before mental work, get real sleep, and test before you supplement.
That last step is where BetterBrain can help. Blueprint covers the testing, 50+ biomarkers plus cognitive testing and a 1:1 consultation to walk through your results, for $89 with insurance. And if you finish your results thinking "okay, but what should I actually do," that is what our 12-week Coaching Program is for. 92% of eligible customers pay $0 with insurance.
If you want to go deeper, listen to the full episode, and check out Tommy's new book, The Stimulated Mind: Future-Proof Your Brain from Dementia and Stay Sharp at Any Age, which covers the same ground in more depth through his 3-S model: challenge the brain, feed it, and let it recover.
Frequently asked questions
At what age does cognitive decline start?
Later than most people think. Wood notes that mental processing speed tends to hold steady until around age 60, and that much of what we attribute to aging actually reflects reduced challenge. The brain keeps what you use and prunes what you stop using, at any age.
Are crosswords and sudoku enough to keep your brain sharp?
Probably not. Wood describes them as more relaxing than challenging, since they exercise skills you already have. To build new capacity, choose activities that are new, hard, and social, like dancing, ball sports, martial arts, or learning a language.
What is the best exercise for brain health?
Both aerobic and resistance training, for different reasons. Harder aerobic work like intervals builds the hippocampus and supports memory, while resistance training builds white matter and supports decision-making. A 20 to 30 minute session right before mental work also sharpens learning in the moment.
Should I take supplements for brain health?
Test first. Standard "normal" lab ranges are not the same as optimal ranges, and some nutrients depend on each other. Omega-3 and B vitamins, for example, only work when you have both, which is why measuring biomarkers like homocysteine beats guessing. Creatine and a basic omega-3 plus B-vitamin stack have modest, real evidence behind them.
You Can Now See the Studies Behind Every BetterBrain Recommendation
There's a lot of brain health advice on the internet, and most of it comes with the same problem: no way to tell where it came from or whether it's trustworthy.
Someone tells you sauna is good for your brain. Or that you should be lifting. Or that omega-3s matter. And you're left to either take it on faith or go digging through PubMed yourself. Most people, reasonably, just take it on faith.
We've never loved that. Trust in health advice should be earned, not assumed. So we did two things worth telling you about.
The Content Library: curated, not crowdsourced
If you haven't spent time in the Content Library inside your dashboard, it's worth a look. It's a growing, curated collection of the best brain health content we can find: videos, podcasts, articles, and clips from people who actually know what they're talking about.
Think Andrew Huberman on light and sleep. Rhonda Patrick on sauna and exercise. Our own Chief Science Officer, Dr. Tommy Wood, on reducing cognitive decline. And a lot more.
You can search it, filter by format, and save what you want to come back to. And BeBe, our AI assistant, can point you to the right thing for wherever you are. Ask about sleep, and it hands you the specific episode worth your time instead of making you wade through everything. It's the difference between a search engine and a good friend who's already done the reading.
Not a BetterBrain client yet? You can access the Content Library for free with a Self-Directed account.
The studies behind your plan
This is the part we're most excited about.
Every technique and recommendation in your BetterBrain plan is now linked to the actual research behind it: the specific studies connected to the specific practice, biomarker, or body system they support. When BeBe or your coach suggests something, you can trace it straight to the evidence and see how strong it is.
This was a big project. It brings roughly 1,500 studies into the app, each mapped to the techniques and markers it relates to. Weak or unsupported studies were deliberately left out, so what's linked is the evidence we'd actually stand behind.
Why evidence strength matters
Not every recommendation carries the same weight. Some are backed by large randomized controlled trials. Others rest on smaller or observational work. You deserve to know which is which.
Linking the studies does two things. It keeps us accountable to the evidence. And it lets you make informed decisions instead of just following instructions.
It's the same standard we hold ourselves to internally: when a new study comes out, we read it, assess it, and only fold it into what we recommend if it holds up.
Why this fits how we think about brain health
Brain health is a field with real science and a lot of noise, and the two are easy to confuse. We try to stay on the science side of that line and be honest about what's solid, what's promising, and what's still an open question.
Making the research visible is that principle made concrete. If we recommend it, you should be able to check it.
How to explore
Open any technique in your plan and scroll to the bottom to see the relevant studies. Or ask BeBe why it recommends any technique in your plan, and follow the research yourself.
And if you're reading this as someone who hasn't started with us yet: this is what BetterBrain is. Evidence-based guidance to sharpen your brain health now and reduce dementia risk long-term, backed by research you can verify rather than wellness advice you have to trust blindly. BetterBrain coaching is covered at $0 for 92% of approved clients. See if you're covered.
Bottom line
The Content Library puts the best brain health content in one curated place. And every technique in your plan is now linked to the real research behind it.
Trust in health advice should be earned. Now you can check ours.
Grey Matters: The 8-week practice that physically changes your brain
This week, we're exploring stress and brain health: what chronic stress does to your hippocampus (your brain's memory center), how mindfulness and other stress management techniques reverse that damage with measurable structural changes, and what an effective practice actually looks like.
From mechanisms to practical starting points, here's why managing stress isn't just about quality of life, it's about protecting your cognitive future.
Bottom line: Chronic stress doesn't just feel bad, it physically shrinks your hippocampus, the brain's primary memory center. Mindfulness meditation reverses this process, with structural brain changes visible on MRI after just 8 weeks.
Stress is easy to dismiss as a quality-of-life issue rather than a brain health issue. But the neuroscience tells a different story.
The problem: When your brain perceives a threat, it releases cortisol. In short bursts, this is adaptive, it helps you respond to challenges. Under chronic stress, sustained cortisol elevation becomes toxic to your neurons, particularly in the hippocampus. Your hippocampus is packed with cortisol receptors. Over time, chronic cortisol exposure causes the neural branches that allow brain cells to communicate to shrink. This leads to measurable hippocampal volume loss, reduced formation of new brain cells, and impaired memory. This process overlaps directly with early Alzheimer's pathology. Hippocampal shrinkage is one of the earliest detectable structural changes in Alzheimer's progression, and chronic psychological stress is now recognized as a modifiable dementia risk factor in its own right.
What mindfulness does instead: In 2011, researchers at Harvard-affiliated Massachusetts General Hospital published a landmark neuroimaging study. Using MRI, they measured brain gray matter density before and after 8 weeks of mindfulness practice in healthy adults. Participants showed measurable increases in gray matter in the hippocampus and the brain regions involved in learning and emotional regulation. At the same time, gray matter in the amygdala (the brain's primary stress and threat-detection center) decreased. A control group who didn't practice mindfulness showed none of these changes. This wasn't comparing long-term meditators to non-meditators. It was before-and-after imaging of the same brains, across 8 weeks of practice.
The mechanism: Mindfulness practice reduces cortisol output, calms the amygdala's threat response, and reduces chronic low-grade inflammation associated with sustained stress. These are the same pathways implicated in accelerated cognitive aging.
Technique Spotlight
What this looks like in practice
The science: Stress management works through overlapping biological pathways: reducing cortisol output, calming your nervous system's threat response, and lowering systemic inflammation. Different techniques access these pathways in different ways, which means you have options.
Getting started with the Essential interventions:
- Slow and deep breathing (Essential): Controlled breathing activates your parasympathetic nervous system, your body's "rest and digest" mode. Even a few minutes measurably reduces cortisol and heart rate. Often the easiest entry point.
- Mindfulness meditation (Essential): The technique behind the brain imaging study above. Consistent practice, even 8 to 10 minutes daily, produces measurable effects on stress hormones and self-reported stress within a few weeks.
- Nature exposure (Essential): Time in natural environments reduces cortisol, lowers blood pressure, and improves mood. The effect is dose-dependent.
- Social support (Essential): Strong social connections buffer against stress-related brain damage.
What 10 minutes of mindfulness looks like: Find a quiet spot and sit comfortably. Bring your attention to the physical sensation of your breath, the air moving in and out. Your mind will wander, that's not failure, that's the exercise. Each time you notice it drifting and bring it back, you're doing the rep that builds the skill. There's no perfect posture and no requirement to empty your mind. Just ten minutes of practicing the return.
BetterBrain Tip: Don't overthink which technique to start with. If sitting meditation feels like a stretch, start with a few minutes of slow breathing or a walk outside. The research is clear on this point: the technique that protects your brain is the one you'll actually do.
Featured Biomarker
Tracking stress and its effects
You can't feel your inflammation dropping, but you can measure it. Chronic stress shows up in your bloodwork as elevated hs-CRP, one of the same inflammatory markers associated with cognitive decline. When your stress management practice starts working, that number moves, and BetterBrain's lab panels let you watch it happen.
The effects ripple outward from there. Sleep quality typically improves within weeks of consistent practice, and better sleep gives your glymphatic system (your brain's overnight waste-clearance crew) more time to do its job.
This is what makes stress management such a high-leverage intervention. It never works alone: better stress regulation improves your sleep, better sleep amplifies the benefits of exercise, and lower inflammation makes anti-inflammatory nutrition work harder. Pull one lever and the whole system responds.
BetterBrain Tip: If you're working with a Brain Health Coach, the De-Stress section of your protocol is a natural starting point.
Ready to build a personalized stress management practice? Check if your insurance covers coaching.
Know someone who might benefit from BetterBrain?
Share this referral link and they'll get Essentials labs (50+ biomarkers) for just $39 (normally $89), plus access to $0 coaching with insurance.
Grey Matters: What happens when brain health coaching actually clicks
The idea that changed everything
Exercise snacks. Short, two-minute movement breaks sprinkled throughout the day, designed to keep your body active and your brain engaged without requiring a gym, a plan, or even a change of clothes.
For Kate, who has ADHD and had always found traditional exercise routines overwhelming, this landed differently than most wellness advice. As she puts it, going to the gym always felt like too many steps, and even home workouts were hard to start. But the idea of standing up once an hour, moving for two minutes, and sitting back down? That felt doable. She built the habit into her coaching Action Plan, and those small bursts of movement started adding up across the day.
Then she started thinking bigger. What if someone is on an airplane and can't do floor exercises? What about people in wheelchairs, or people who are bed-bound and need gentle ways to stay active? What about someone in a professional setting who wants something more meditative, like tai chi? She kept imagining more situations, more people who could benefit, and eventually she thought: wouldn't it be great if there were an app built entirely around this?
So she built one herself
Kate had never written a line of code. She's comfortable with email, Google products, and Zoom, and that's about it. But she started watching YouTube tutorials on using AI to build apps, taught herself how to use a computer terminal along the way, and over the course of about a month designed, built, and shipped a fully functional app to the App Store.
The app is calledExercise Snacks for Health & Wellbeing, and it's free. It sends hourly movement reminders, offers exercises for different settings and mobility levels, and tracks your activity so you can watch those two-minute sessions add up across the day. She uses it herself every day, and she also published a companion book (free with Kindle unlimited).
Cognitive Engagement
Here's something worth noting: the process of learning to build the app may have been just as good for Kate's brain as the exercise snacks themselves. Research consistently shows that picking up unfamiliar, challenging skills is one of the most powerful ways to build cognitive reserve and support long-term brain health. It's why Learn is one of BetterBrain's 12 core brain health practices. Working through frustration, solving new problems, and learning something completely outside your comfort zone is exactly the kind of stimulation your brain thrives on. Kate came to BetterBrain looking for answers about movement and ended up giving her brain a workout in two completely different ways.
Why we wanted to share this
Because the science only matters when someone picks it up and does something with it. Kate worked with a coach, understood what her body and brain needed, and took one piece of her plan and turned it into something that could help thousands of other people move more throughout their day. That's exactly what this whole approach is designed to make possible.
Huge kudos to Kate. And hopefully her story inspires you to try something new, whether that's exercise snacks, a skill you've been putting off, or finally booking that first coaching session.
Know someone who might benefit from BetterBrain?
Share this referral link and they'll get Essentials labs (50+ biomarkers) for just $39 (normally $89), plus access to $0 coaching with insurance.
Get immediate insights with a 3 minute assessment
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GreyMatters
Grey Matters: What happens when brain health coaching actually clicks
The idea that changed everything
Exercise snacks. Short, two-minute movement breaks sprinkled throughout the day, designed to keep your body active and your brain engaged without requiring a gym, a plan, or even a change of clothes.
For Kate, who has ADHD and had always found traditional exercise routines overwhelming, this landed differently than most wellness advice. As she puts it, going to the gym always felt like too many steps, and even home workouts were hard to start. But the idea of standing up once an hour, moving for two minutes, and sitting back down? That felt doable. She built the habit into her coaching Action Plan, and those small bursts of movement started adding up across the day.
Then she started thinking bigger. What if someone is on an airplane and can't do floor exercises? What about people in wheelchairs, or people who are bed-bound and need gentle ways to stay active? What about someone in a professional setting who wants something more meditative, like tai chi? She kept imagining more situations, more people who could benefit, and eventually she thought: wouldn't it be great if there were an app built entirely around this?
So she built one herself
Kate had never written a line of code. She's comfortable with email, Google products, and Zoom, and that's about it. But she started watching YouTube tutorials on using AI to build apps, taught herself how to use a computer terminal along the way, and over the course of about a month designed, built, and shipped a fully functional app to the App Store.
The app is calledExercise Snacks for Health & Wellbeing, and it's free. It sends hourly movement reminders, offers exercises for different settings and mobility levels, and tracks your activity so you can watch those two-minute sessions add up across the day. She uses it herself every day, and she also published a companion book (free with Kindle unlimited).
Cognitive Engagement
Here's something worth noting: the process of learning to build the app may have been just as good for Kate's brain as the exercise snacks themselves. Research consistently shows that picking up unfamiliar, challenging skills is one of the most powerful ways to build cognitive reserve and support long-term brain health. It's why Learn is one of BetterBrain's 12 core brain health practices. Working through frustration, solving new problems, and learning something completely outside your comfort zone is exactly the kind of stimulation your brain thrives on. Kate came to BetterBrain looking for answers about movement and ended up giving her brain a workout in two completely different ways.
Why we wanted to share this
Because the science only matters when someone picks it up and does something with it. Kate worked with a coach, understood what her body and brain needed, and took one piece of her plan and turned it into something that could help thousands of other people move more throughout their day. That's exactly what this whole approach is designed to make possible.
Huge kudos to Kate. And hopefully her story inspires you to try something new, whether that's exercise snacks, a skill you've been putting off, or finally booking that first coaching session.
Know someone who might benefit from BetterBrain?
Share this referral link and they'll get Essentials labs (50+ biomarkers) for just $39 (normally $89), plus access to $0 coaching with insurance.
Grey Matters: One coach’s most effective brain health strategies
Meet Sarah Ferreira, MS, MPH, RD, IFNCP: Brain Health Coach
Sarah Ferreira, MS, MPH, RD, IFNCPis an integrative and functional dietitian with dual master's degrees in Nutrition and Public Health, plus additional training in applied neuroscience and brain health. Her clinical interests include dementia prevention, neurological conditions, thyroid and digestive health, and the psychology of eating behavior.
Sarah's career spans inpatient clinical nutrition, eating disorder treatment, community nutrition with WIC, and 1:1 and group work at the Cleveland Clinic Center for Functional Medicine. She's passionate about helping people build confidence through knowledge and celebrating strategic successes over time.
Outside of her professional life, Sarah can often be found with a stack of library books, at a flamenco dance class, or spending time outdoors with her young son. She believes the fullest life is best lived with strong black coffee, flavorful curries, and mango in just about any form.
Sarah's Top Recommendations
Her new favorite brain health technique:
"My new favorite brain health technique is supplementing with Magnesium L-Threonate, a form of magnesium with some evidence of the ability to cross the blood brain barrier more efficiently than other types. I love it because it supports clearer thinking, better focus, and a calmer nervous system without feeling sedating. It's become a simple daily ritual that I plan to keep!"
Here's one of our favorite magnesium picks.
A simple strategy that's been especially effective for clients:
"Sleep troubles are so frustrating, and make it much more difficult to focus, maintain healthy blood sugar, and keep energy levels up. A simple strategy I've been talking about with clients who struggle with sleep is lowering the room temperature at night.
As bedtime approaches, core body temperature should drop; a cooler environment reinforces this process and signals the brain that it's time to wind down. Sleeping in a cooler room, typically around 60 to 67°F, has been shown to promote deeper slow wave sleep and reduce nighttime awakenings. A cooler setting can also prevent overheating, which is a common disruptor of REM sleep. Altogether, adjusting the thermostat is a simple, evidence aligned way to improve both the depth and consistency of your sleep."
A mindset shift that makes a big difference:
"Shifting away from 'ideal or nothing' thinking can be incredibly freeing and supportive of long term success. When clients think in extremes like 'I need to be at the gym for 45 minutes in order to exercise,' or 'If I can't do this perfectly, it's pointless,' I encourage them to think about the next best step and adopt a mindset of purposeful experimentation as they try out new things.
Over time and with consistency, small wins accumulate and foster self compassion, shape our sense of self, increase motivation, and create a positive sense of control over our brain health."
Her go-to brain boosting ritual:
"My go to brain boosting ritual is early morning movement. In the winter, I notice the best benefits for mood and mental clarity with a challenging Pilates session, weight lifting, and indoor cycling. It feels like a major win if I can get it done before my toddler wakes up!"
What she's most excited about in brain health research:
"I'm really excited about the ongoing accumulation of evidence around nutrition and brain health. Studies increasingly show that long term, nutrient dense eating patterns can support memory, focus, and even slow age related cognitive decline. Key nutrients like omega 3 fatty acids, antioxidants, and choline appear to protect neurons, reduce inflammation, and support healthy brain signaling.
What I find especially uplifting is how practical and adaptable these findings are, both for personal habits and for guiding clients. Framing food as a tool for cognitive resilience makes healthy eating feel meaningful and empowering, rather than restrictive."
Content Corner
Huberman Lab: Nutrients For Brain Health & Performance
Bottom line: This Huberman Labs episode is a practical companion to what Sarah shared about nutrition and brain health. Dr. Andrew Huberman, Stanford neuroscientist, breaks down the specific nutrients proven to support brain function, both for immediate cognitive performance and long term brain health.
The episode covers ten science supported tools, starting with the fact that fat is the most important element for brain function because it provides the structural building blocks for neurons. Huberman explains that omega 3 fatty acids, particularly DHA, are essential for brain health, with foods like salmon, mackerel, and sardines being top sources. He recommends 1.5 to 2 grams of DHA daily for those not consuming enough fish.
Beyond omega 3s, he dives into choline (500mg to 1g daily), which supports focus by providing the substrate for acetylcholine, a key neurotransmitter. He also covers anthocyanins from blueberries (60 to 120 grams of fresh berries daily has been shown to enhance cognition in older adults), phosphatidylserine for reducing cognitive decline, and creatine for brain energy, particularly beneficial for those who don't eat meat.
The key insight? Huberman emphasizes that the goal is to get proper nutrients via food first, then use supplements as a backup. He also explores something fascinating: how we can actually rewire our food preferences toward healthier choices by understanding the gut brain connection and the psychology of taste. Our brains can learn to crave the foods that are good for us.
BetterBrain Takeaway:The nutrients Huberman highlights, omega 3s, choline, and antioxidants, are exactly the ones Sarah mentioned being excited about. Whether you're looking to optimize focus now or protect your brain for the long term, this episode offers specific, actionable guidance on what to eat and how much.
Grey Matters: What Sardinians can teach us about brain health
What Makes Sardinia Special
Sardinia is one of five validated Blue Zones, geographically defined areas with disproportionately high concentrations of people living past 100. The others are Okinawa (Japan), Nicoya (Costa Rica), Ikaria (Greece), Loma Linda (California), and Singapore (the most recent addition).
What makes Sardinia particularly fascinating is the male-to-female centenarian ratio: approximately one-to-one, unlike most populations where women vastly outnumber men among centenarians. This gender parity suggests environmental and lifestyle factors, not just genetics, drive exceptional longevity.
The Mediterranean Diet: What the Science Shows
The Mediterranean dietary pattern is central to Blue Zone longevity. Here's what actually matters:
Olive oil is the cornerstone. Extra virgin olive oil is linked to improved cognitive function and a lower risk of cognitive decline in elderly populations. The magic is in the polyphenols, compounds that reduce lipid peroxidation and increase cellular glutathione, enhancing protection against oxidative damage.
Fish and omega-3s provide neuroprotection. Omega-3 fatty acids abundant in fish and nuts have powerful anti-inflammatory properties. Mediterranean populations eat fish multiple times weekly.
Plant-based foods deliver antioxidant firepower. Vegetables, fruits, and whole grains are rich in flavonoids and bioactive compounds with antioxidant and anti-inflammatory properties.
Coffee and tea matter too. A recent JAMA study of 131,821 participants over up to 43 years found higher caffeinated coffee intake was associated with 18% lower dementia risk, with the sweet spot at 2-3 cups daily. Notably, decaffeinated coffee showed no protective effect, suggesting caffeine itself provides neuroprotection.
The complete lifestyle formula: Sardinians don't just eat well. They engage in constant movement through shepherding, farming, gardening, and walking rather than isolated gym sessions. They remain close with friends and family throughout their lives, gathering to laugh together. Laughter reduces stress, which can lower cardiovascular disease risk.
The diet works through multiple mechanisms, exerting protective effects through vasoprotective and neuroprotective pathways that deliver anti-aging benefits to both vascular cells and central nervous system cells. It counteracts mitochondrial dysfunction, oxidative stress, and chronic inflammation (the cellular processes driving brain aging).
Experience Sardinia's Secrets Firsthand with Dr. Annie Fenn
Dr. Annie Fenn is a physician, chef, and leading voice in brain-health nutrition. Through her Substack and bestselling book Brain Health Kitchen, she's made the science of brain-protective eating accessible and delicious for thousands of people. Her approach combines rigorous research with practical cooking techniques, making Mediterranean dietary patterns achievable in everyday life.
This October 12-18, 2026, Dr. Fenn is leading Sardinia's Secrets for a Long and Healthy Life, an immersive retreat in one of the world's original Blue Zones.
Set on the island of Sardinia, this experience blends science-backed education with pure Italian joy: trekking and e-biking, olive oil tasting, cooking with locals, and unforgettable meals rooted in the traditional Mediterranean pattern.
Along the way, you'll be learning practical tools from Dr. Fenn that you can apply to your own brain-healthy lifestyle back home. Learn more and reserve your spot here, or call 877-298-9677.
We're huge supporters of the impact Dr. Fenn is having in the brain health community. Her science-backed techniques align with what we believe about prevention and personalized nutrition. That's why we're thrilled to be a founding sponsor of her new podcast,The Brain Health Kitchen Podcast.This season features BetterBrain's own co-founder Cedric Gousseau, Chief Science Officer, Dr. Tommy Wood, and brain health coach Barbie Boules, among other guests, sharing their expertise on brain-healthy nutrition and lifestyle.
What You Can Do
You don't need to move to Sardinia to benefit (although Dr. Fenn's retreat seems like the perfect compromise). Here's how to implement these patterns on your own:
Build your diet around Mediterranean staples:
Use extra virgin olive oil as your primary fat (2-4 tablespoons daily). Eat fish 2-3 times weekly (salmon, sardines, mackerel). Fill half your plate with vegetables and fruits. Choose whole grains, beans, and legumes. Limit red meat to a few times monthly. Enjoy 2-3 cups of coffee or 1-2 cups of tea daily.
Move constantly: Take walking meetings. Use stairs, garden, cook from scratch. Build activity into daily tasks rather than treating exercise as something separate from life.
Prioritize social connection: Share regular meals with family and friends. Maintain multi-generational relationships. Laugh regularly.
Explore brain-healthy nutrition in your BetterBrain Dashboard. Get personalized guidance on implementing Mediterranean dietary patterns based on your biomarkers, genetics, and health goals.
Bottom Line
Sardinian longevity is about comprehensive lifestyle: Mediterranean dietary patterns rich in olive oil, fish, and plants; constant movement; deep social connections; and purpose. The evidence is strong, the mechanisms are understood, and the principles are implementable today.
Ready to live like a Sardinian and build your brain health foundation? BetterBrain helps you identify and implement the dietary and lifestyle interventions that matter most for your biology. Our coaches create personalized protocols based on your biomarkers, genetics, and health goals.
Grey Matters: The four Essential Techniques our coaches keep recommending
Move Practice: The post meal walk
Maggie works with clients across the metabolic-health side of our client base. The trend she keeps seeing: HbA1c and fasting insulin numbers creeping into pre-diabetic ranges, often without the client realizing it. Many of them are exercising, but most of them are not walking after meals.
"Ten minutes after each meal. That is the rule I get the highest compliance on, because nobody can argue they don't have ten minutes. And it does more than people expect."
The evidence behind post meal walks is broad and the bar to entry is low. A short walk after eating blunts the post-meal glucose spike. Repeated over months, it is one of the most reliable ways we have seen to shift HbA1c, fasting insulin, and the metabolic conditions that drive midlife brain atrophy. The cost is nothing, the schedule disruption is minimal, and the long-term payoff compounds. It is essential because it works for almost everyone.
Sleep Practice: Consistent wake time and morning light
Emily works with a large share of our clients who came to BetterBrain because of family history of dementia. The trend she keeps seeing: anxious clients arriving with long supplement lists, wanting to talk about pTau-217 and APOE4, while sleeping six or fewer hours a night.
"One night of four hours isn't really the question. The question is why someone is typically sleeping four or five hours at most. Patterns matter. What we identify from the first visit and where we end up is more than one night of poor sleep. Sleep is the foundation. Exercise goals, stress management, eating, they all land once sleep patterns are optimized."
The Essential Technique Emily points to first is in our Sleep Practice: a consistent wake time paired with morning light. The reason this is essential for almost everyone is the glymphatic system. Sleep is the period during which the brain runs its only clearance system, including the clearance of amyloid. A consistent wake time anchors the circadian rhythm, and morning light reinforces it. The evidence is strong, the intervention is free, and it works for clients in their 30s and their 70s.
Move Practice: Strength Training
Wendy works with many of our clients in their late fifties and sixties. The trend she keeps seeing: clients who are doing aerobic exercise faithfully, often three or four days a week, and skipping strength training entirely.
“I’m flexible with many aspects of a health plan, but strength training is one area I strongly encourage people not to overlook. The research connecting muscle mass and brain health after 50 is incredibly compelling, and maintaining strength now can have a major impact on long-term health and quality of life.”
Strength training is another Essential Technique in our Move Practice. The reason it is essential, not optional: muscle is the primary site of glucose disposal in the body, the pathways linked to neurogenesis are responsive to resistance training, and sarcopenia is one of the strongest predictors of cognitive decline in older adults. The evidence supports two sessions a week, moderate intensity, sustained for at least six months. Bodyweight work and resistance bands are enough to start. The technique is essential because everyone past 30 is slowly losing muscle, and the cost of skipping it is too high.
Supplement Practice: Methylated B Vitamins
Another trend we keep seeing across our client base: people arriving with homocysteine in the 11 to 14 range, told by their primary care that it is fine. The gap between what is flagged at most labs and what is optimal for brain health is one of the cleanest examples of where our framework differs from standard care.
The optimal range for homocysteine is under 9 μmol/L. Most labs flag a result only above 15. The 9 to 14 range is where a meaningful number of clients are quietly carrying elevated risk that has been waved off. A methylated B-complex moves the marker for the majority of clients within three months, and the cognitive payoff is real.
The Essential Technique in our Eat Practice is targeted methylated B-complex supplementation. The reason this is essential for almost everyone has to do with the underlying biology. Homocysteine is cleared through methylation pathways that depend on the active forms of folate, B12, and B6. A significant portion of the population carries variants of the MTHFR gene that reduce how well the body converts standard folic acid into the active form.
Methylated B-complexes deliver the active forms directly. For anyone over 40 thinking about long-term brain health, this is one of the highest-leverage interventions available.
What the pattern reveals
Across our coaches with different specialties and different client populations, the same Essential Techniques keep coming up. These are the techniques that consistently move the needle, regardless of who is doing them. What our coaches actually do day to day is build action plans that span the full technique library: prioritizing among the Essentials and layering in the context-dependent techniques that fit each client’s panel and life.
The Essentials are universal. The action plan is personal.
If you are thinking about long-term brain health, the Essential Techniques are the highest-leverage place to start. They are the techniques our clinical advisors backed because the evidence is strong and they work for almost everyone.
If you’d like a quick read on which Essential Techniques to prioritize based on what you are already doing, take the free Essential Scan. Open to anyone, whether you’re already a BetterBrain client or just starting.
If you’d like a deeper personalized action plan, BetterBrain coachingpairs you with a Brain Health Coach who builds the plan with you based on your biology and lifestyle.
How to Personalize Your Brain Health Plan With Your Own Data
How to Personalize Your Brain Health Plan With Your Own Data
Most brain health advice is useful, but it is also designed for the average person.
Sleep more. Move often. Eat a nutritious diet. Manage stress. Build strength.
These fundamentals matter. But they cannot tell you which risk factors deserve the most attention, what may be changing in your body, or whether your current routine is producing the results you want.
Personalized brain health guidance uses your own labs, health history, sleep, activity, habits, and goals to help determine where to focus first.
BetterBrain members can now bring more of that information into My Vault, the health data home inside the BetterBrain platform. You can upload previous lab results, connect wearable data, and import relevant health context from an AI assistant such as ChatGPT, Claude, or Gemini.
All three tools are available free across BetterBrain accounts.
Why Does Generic Brain Health Advice Have a Ceiling?
General health advice tells you what tends to help people on average. It cannot tell you which intervention is likely to matter most for you.
Two people can follow the same routine and have very different needs because they begin with different:
- Biomarker levels
- Genetics and family histories
- Sleep patterns
- Activity levels
- Medical histories
- Medications and supplements
- Diets, habits, and goals
One person may need to focus on improving sleep consistency. Another may already sleep well but have an elevated cardiovascular risk marker that deserves more attention. A third may be exercising regularly but not recovering adequately.
That is why personalization matters. It helps turn broad recommendations into clearer priorities.
Research has also found that multidomain brain health interventions tailored to individual risk profiles can produce better cognitive outcomes than general health information alone. You can read the randomized controlled trial published in Nature Medicine here.
What Is Personalized Brain Health Guidance?
Personalized brain health guidance applies current research to information about your own health.
Instead of simply telling everyone that sleep is important, personalized guidance can consider:
- How much you are actually sleeping
- Whether your sleep duration or consistency is changing
- How your sleep relates to your activity and recovery
- Whether your current protocol appears to be helping
- Which other risk factors may deserve attention
Personalization does not replace the fundamentals. It helps identify which fundamentals matter most for you, where to begin, and what to monitor over time.
How Does My Vault Help Personalize Your Brain Health Plan?
My Vault brings several sources of health information together inside your BetterBrain account.
You can use it to:
- Upload previous laboratory results
- Connect sleep and activity data from a wearable
- Import relevant health context from another AI assistant
Together, these tools give BeBe, BetterBrain’s AI brain health coach, a more complete picture of your health and goals.
Upload Past Lab Results and Track Changes Over Time
A single laboratory result is only a snapshot. The trend often provides more useful context.
If you have previous results stored in a patient portal, computer folder, email, or paper file, you can upload them to My Vault as a PDF or image. BetterBrain can extract the biomarker results and display them alongside your current numbers.
Tracking results over time can help you understand:
- Whether a biomarker is moving in the desired direction
- Whether a change is new or part of a longer pattern
- How your results respond to changes in your routine
- Whether an intervention appears to be working
- Which markers may deserve further discussion with your clinician
For example, a cholesterol result may appear acceptable when viewed alone. But seeing several years of results together could reveal that the number has been steadily increasing or improving.
Your brain health plan should respond to what is changing, not just what appeared on one test.
Link Your Wearable Data
Questionnaires capture what you remember. Wearables can capture what is happening each day.
If you use a fitness tracker or smartwatch, you can connect it to BetterBrain through the BeBe app and Apple Health. You choose which information you want to share, and you can change the permissions or disconnect the integration at any time.
Depending on your device and permissions, wearable data may provide useful context about:
- Sleep duration
- Sleep consistency
- Daily movement
- Exercise
- Heart rate
- Recovery patterns
- Changes in routine
This can make guidance more specific.
Instead of receiving another reminder that sleep is important, you may be able to see that your sleep duration is adequate but inconsistent, or that your activity has declined over the past several weeks.
The goal is not to obsess over every daily number. It is to recognize meaningful patterns that may otherwise be easy to miss.
Import Your AI Memory
Many people already use ChatGPT, Claude, or Gemini to discuss their health, routines, goals, and preferences.
You may have already told an AI assistant about:
- Your health history
- Current symptoms or concerns
- Injuries
- Medications and supplements
- Family medical history
- Exercise habits
- Diet
- Sleep
- Health goals
- How you prefer advice to be delivered
- Strategies you have already tried
You can now bring that context into BetterBrain instead of starting from the beginning.
Visit Import AI Memory inside My Vault. You will see a prompt that you can open or paste into the AI assistant you use. The assistant will organize the relevant information it knows about you. You can then review the response and paste it into BetterBrain.
The process takes about a minute.
Once imported, BeBe can begin with more context about your history, preferences, goals, and previous efforts.
How Is BeBe Different From ChatGPT, Claude, or Gemini?
General AI assistants draw from broad knowledge across an enormous range of subjects. Their responses are also largely shaped by what you choose to tell them in each conversation.
BeBe is built specifically for brain health. It is grounded in brain health research that has been reviewed and interpreted by BetterBrain’s scientists and clinicians.
BeBe can then apply that specialized knowledge to information within your BetterBrain account, including:
- Your laboratory history
- Wearable sleep and activity data
- Health profile
- Current brain health protocol
- Uploaded documents
- Coaching insights
- Imported health context
- Personal goals and preferences
The distinction is specialized brain health science combined with your personal data.
A general assistant may repeat common recommendations. BeBe is designed to help you understand how the evidence relates to your own risks, results, and priorities.
Is My Health Information Private?
Your imported information stays private to your account and is used to personalize your guidance.
You control what you upload, what wearable information you share, and whether you want to delete information later. Wearable permissions can also be changed or turned off at any time.
Only import information you are comfortable storing in your BetterBrain account.
How Do I Get Started With My Vault?
You do not need to complete everything at once.
Start with whichever option is easiest:
- Upload one previous lab report.
- Connect your wearable through the BeBe app and Apple Health.
- Import relevant health context from ChatGPT, Claude, or Gemini.
- Review your health profile and current protocol.
- Ask BeBe what patterns or priorities stand out.
All three personalization tools are available with a free Self Directed BetterBrain account.
Members who want to go further can also purchase laboratory testing through Blueprint or enroll in the BetterBrain Coaching Program.
Frequently Asked Questions About Personalized Brain Health Guidance
What is personalized brain health guidance?
Personalized brain health guidance applies scientific evidence to information about your individual labs, health history, sleep, activity, habits, risk factors, and goals. It helps identify which actions may deserve the most attention for you.
What is BetterBrain My Vault?
My Vault is the health data home within your BetterBrain account. It allows you to upload lab reports and other files, complete your health profile, record your current protocol, connect wearable data, and import relevant health context from another AI assistant.
Why should I upload previous lab results?
Previous results help establish a trend. Comparing multiple tests over time can show whether a biomarker is improving, worsening, or remaining stable.
What wearable data can BetterBrain use?
Available data depends on your device and Apple Health permissions. It may include sleep, activity, exercise, heart rate, and other daily health metrics.
Can I control which wearable information I share?
Yes. You choose which Apple Health categories to share and can update your permissions or disconnect the integration later.
What does importing AI memory mean?
Importing AI memory means asking ChatGPT, Claude, or Gemini to summarize relevant information it already knows about your health, preferences, habits, and goals. You can review that response before pasting it into BetterBrain.
Does BetterBrain automatically access my ChatGPT or Claude conversations?
No. You choose what to export, review the response, and manually paste it into BetterBrain.
How long does it take to import AI memory?
The process typically takes about a minute. BetterBrain provides a prompt that helps your existing AI assistant organize the relevant information.
Are the My Vault personalization tools free?
Yes. Uploading previous labs, connecting wearable data, and importing AI memory are available across BetterBrain accounts, including free Self Directed accounts.
Does BeBe replace a doctor?
No. BeBe provides educational brain health guidance and helps you understand your data and potential priorities. It does not replace medical diagnosis, treatment, or care from a licensed healthcare professional.
The Glymphatic System: Why Deep Sleep Is Your Brain's Best Cleanup Tool
Featured System: How Your Brain Takes Out the Trash
Every other tissue in your body has lymphatic vessels to carry away metabolic waste. For a long time the brain was thought to be the exception, with no obvious plumbing for the job. That changed in 2013, when researchers described what’s now called the glymphatic system: a network that uses cerebrospinal fluid to flush waste out of brain tissue, including amyloid-beta and tau, the proteins that accumulate in Alzheimer’s disease.
The finding that reshaped how we think about sleep came alongside it. Glymphatic clearance is not constant. It ramps up dramatically during deep, slow-wave sleep, when the spaces between brain cells expand and fluid can move through more freely. This is one of the clearest biological reasons that sleep is not optional maintenance. It is when a specific, measurable cleanup process actually runs.
So the existence of the system is well established. The question researchers have kept working on is mechanical: what physically moves the fluid?
What the newer research adds
A 2025 study in Cell from Maiken Nedergaard’s group (one of the labs behind the original glymphatic work) helps answer that question. In mice, the team showed that during deep sleep a small brainstem region called the locus coeruleus releases norepinephrine in slow, rhythmic waves, roughly one every fifty seconds. Each wave gently tightens and relaxes the blood vessels, and that slow oscillation appears to act like a pump, driving cerebrospinal fluid through the brain to move waste along.
It’s an elegant result because it connects three things we already knew were related (deep sleep, blood-vessel tone, and fluid clearance) into a single mechanism. It reframes deep sleep not as the brain idling, but as the brain running a coordinated pump.
Two points of rigor worth keeping straight, because they change how much weight any single study can carry:
- This is animal research. The norepinephrine-wave mechanism has been demonstrated in mice, whose sleep biology is a strong but imperfect model for ours. It tells us how the system likely works; it is not a human clinical trial.
- And the same study raised a careful question about sleep medication. The researchers found that zolpidem (the active ingredient in Ambien) suppressed these norepinephrine waves in mice and reduced fluid flow. That is a genuinely interesting signal, but it is a finding in animals about a mechanism, not evidence that a prescription harms people. If you take a sleep aid, this is not a reason to stop. It is a reason to make the underlying sleep quality a real conversation with your doctor.
Bottom Line: The glymphatic system and its dependence on deep sleep are well established. The newer work gives us a plausible engine for it, the slow norepinephrine rhythm of deep sleep, and a reminder that how you sleep, not just how long, is what lets the system do its job.
What this means for you
None of this requires a new gadget or supplement. It reinforces the fundamentals, and gives you a sharper reason to take them seriously.
Protect the deep-sleep window. Slow-wave sleep is concentrated in the first half of the night. A consistent wake time, morning light exposure, and a cool, dark room are the most reliable ways to protect it.
Be honest about alcohol and late meals. Both fragment the deep-sleep stages where clearance is most active. You may fall asleep fine and still lose the part of the night that matters most here.
Treat sleep as something you can measure. The same way we track a biomarker, sleep consistency and quality are worth paying attention to over time rather than guessing at.
Take loud snoring or daytime exhaustion seriously. These can signal sleep apnea, which repeatedly interrupts the deep sleep this system depends on, and it is both common and treatable. It’s worth flagging to a clinician.
Keep prescriptions in your doctor’s hands. If you use a sleep medication, bring the goal of better sleep quality to your prescriber rather than changing anything on your own.
Your BetterBrain coach can help you turn any of this into a specific, trackable Sleep Practice rather than a vague intention to "sleep better."