Eat · Brain health technique
Low-fat diet
Evidence grade: Weak
A dietary approach that limits total fat, especially saturated fat, to around 20–30% of calories, emphasizing grains, fruits, vegetables, and lean proteins while minimizing oils, butter, fatty meats, and full-fat dairy. It aims to reduce calorie density and cardiovascular risk through lower fat intake.
- Practice
- Eat
- Principle
- Nourishment
- Tactic
- Holistic Nutritional Strategies
- Evidence grade
- Weak
- Strength of evidence
- Low
How to practice Low-fat diet
Focus on replacing saturated fats (butter, fatty meats) with healthy unsaturated fats (olive, avocado, nuts) rather than eliminating fat entirely. Keep total fat moderate, roughly 25–35% of calories, while emphasizing whole grains, legumes, fruits, and vegetables. Purely low-fat processed foods (fat-free cookies, dressings) often raise sugar intake and undermine goals. For brain health, prioritize omega-3-rich foods over simply cutting fat.
The evidence behind Low-fat diet
Early RCTs linked low-fat diets to modest reductions in cholesterol but inconsistent effects on cardiovascular or cognitive outcomes. Some studies suggest very low-fat diets can lower HDL and impair absorption of fat-soluble nutrients. Evidence indicates that fat quality (unsaturated vs. saturated) matters more than quantity. Populations thriving on low-fat diets often also consume high fiber and minimal processed food, confounding attribution.
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