Supplement · Brain health technique
Prebiotics
Evidence grade: Context Dependent
Non-digestible fibers (e.g., inulin, FOS, GOS, resistant starch) that selectively feed beneficial gut bacteria, promoting production of short-chain fatty acids (SCFAs) such as butyrate that support gut and brain health.
- Practice
- Supplement
- Principle
- Nourishment
- Tactic
- Gut-brain & Immune Axis Support
- Health domains
- gut health
- Evidence grade
- Context Dependent
- Strength of evidence
- Medium
- Cost
- High
- Effort
- Low
- Time commitment
- Low
How to practice Prebiotics
Gradually increase intake of prebiotic fibers through food first: onions, garlic, leeks, bananas, oats, legumes, and cooked–cooled potatoes. Women should try to eat at least 21 to 25 grams of fiber a day, while men should aim for 30 to 38 grams a day. Supplemental forms (inulin or GOS, 3–5 g/day) can be added if diet is low in fiber. Start slowly to prevent bloating. Consistency over time is key; effects build over weeks.
The evidence behind Prebiotics
SCFAs from prebiotic fermentation reduce systemic inflammation, enhance gut barrier integrity, and modulate neurotransmitter production. RCTs show improvements in mood, attention, and stress response, especially in those with low fiber intake. Evidence is robust for digestive and immune health, with indirect cognitive benefits supported by mechanistic studies.
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