Nutrition topic
Nuts (Walnuts, Almonds, Brazil Nuts)
Last updated Sat May 30 2026 00:00:00 GMT+0000 (Coordinated Universal Time)
Observational— Multiple large cohorts converge on ~20% mortality reduction
The mortality signal
Bao et al. 2013 (Nurses' Health + Health Professionals Follow-up):
- Daily nut consumption: 20% lower all-cause mortality.
- Cardiovascular mortality: 29% lower.
- Cancer mortality: 11% lower.
- Dose-response clear up to ~30 g/day.
PREDIMED trial confirmed: Mediterranean diet + 30 g/day mixed nuts reduced cardiovascular events ~28%.
What each nut contributes
| Nut | Key features |
|---|---|
| Walnut | High plant omega-3 (ALA); cognitive cohort signal |
| Almond | Vitamin E, magnesium, calcium, prebiotic fibre |
| Brazil nut | Highest natural selenium (1 nut = day's RDA; avoid eating handfuls) |
| Pistachio | Fibre, potassium, lutein/zeaxanthin |
| Pecan | Antioxidant capacity (high ORAC); manganese |
| Cashew | Magnesium, copper (lower fibre and protein than others) |
| Macadamia | Highest monounsaturated fat; low PUFA |
| Hazelnut | Vitamin E, folate |
Brazil nut caveat
Selenium toxicity is real with prolonged daily handfuls of brazil nuts. 1–2 per day is fine; more risks selenosis (hair loss, brittle nails, neuropathy). Selenium content varies massively by soil — brazil nuts from Bolivia/Peru are much higher than US-grown.
Cautions
- Allergy is significant for some.
- Calorie density: easy to over-consume. ~180 kcal per ~30 g.
- Oxidation: store cool, dark; rancid nuts (acrid taste) deliver pro-oxidant rather than anti-oxidant load.
Related entries
References
- Bao, Y. et al. Association of nut consumption with total and cause-specific mortality. N. Engl. J. Med. 369, 2001–2011 (2013).