Eleven foods with actual research supporting cognitive benefits. No magical claims — each has documented effects on brain function, long-term cognition, or neurological health.

1. Fatty fish (salmon, sardines, mackerel). Omega-3 DHA is the single most-researched brain-beneficial nutrient. 2-3 servings per week is the evidence-based target.
2. Blueberries. Flavonoids cross the blood-brain barrier; longitudinal studies show reduced age-related cognitive decline in regular blueberry eaters.
3. Leafy greens (spinach, kale). Folate and vitamin K support cognitive health; associated with slower age-related decline.
4. Nuts (especially walnuts). Omega-3s, vitamin E, antioxidants. Associated with better cognitive performance in older adults.
5. Eggs. Choline supports neurotransmitter synthesis and memory function.
6. Dark chocolate (70%+). Cacao flavonoids improve cerebral blood flow; modest but consistent cognitive effects in trials.
7. Green tea. L-theanine + caffeine combo produces focused calm; neuroprotective compounds in long-term consumption.
8. Turmeric. Curcumin crosses the blood-brain barrier; studies show cognitive benefits in aging populations (absorption improved by black pepper).
9. Coffee. Caffeine + polyphenols; moderate intake (3-4 cups/day) associated with reduced Alzheimer's and Parkinson's risk.
10. Whole grains. Steady glucose supply for brain; fibre supports gut-brain axis.
11. Olive oil (extra virgin). Mediterranean diet studies consistently link EVOO to better cognitive outcomes in aging populations.

Eleven foods. Three or four of them in your regular diet covers most of the cognitive benefits; the rest are icing. Mediterranean- style eating built around fish, vegetables, olive oil, nuts, and whole grains has the strongest evidence base for brain health — and these foods are its core.