Nutrition topic

Berries & Polyphenols

Last updated Sat May 30 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

Observational— Nurses' Health Study cognition data; small RCT BP/lipid effects

Why berries stand out

Berries are dense in anthocyanins (the pigments giving them their colour) and other flavonoids. Anthocyanin-rich foods stand out in epidemiology and small trials:

Cardiovascular events: ~12–15% lower in highest-intake groups.
Cognitive decline: ~2.5 years' slower decline at ≥2 servings/week (Devore 2012).
Endothelial function: improvements with blueberry RCTs.
Insulin sensitivity: small improvements.

Practical

Mix berries into yoghurt, oats, or smoothies daily.
Frozen berries are as polyphenol-rich as fresh and avoid spoilage.
Avoid berry "supplements" / extracts — whole-food matrix matters.

Other anthocyanin-rich foods

Black plums, black grapes, red cabbage, pomegranate, hibiscus tea, black rice, eggplant skin.

Caveat

The relationship is observational. Heavy fruit-juice consumption (the high-anthocyanin liquid stripped of fibre) does not show the same benefits and may worsen glycaemic load.

References

Devore, E. E. et al. Dietary intakes of berries and flavonoids in relation to cognitive decline. Ann. Neurol. 72, 135–143 (2012).