Eat a small handful of nuts and seeds daily

A 30 g daily serving of walnuts, almonds, or mixed nuts delivers fat, protein, and key micronutrients for brain function.

Why it works

Nuts are dense in magnesium (a NMDA receptor modulator implicated in depression), zinc (essential for hippocampal neurogenesis), and vitamin E (lipid-soluble antioxidant protecting neuronal membranes). Walnuts in particular contain ALA omega-3s and polyphenols that support the gut microbiome. Regular nut consumption is consistently associated with reduced systemic inflammation markers.

How to do it

1. Measure out a 30 g portion (roughly a small handful) rather than eating from the bag.
2. Keep an unsealed container of mixed nuts at your desk or in your bag as the default snack.
3. Rotate between walnuts (omega-3), almonds (vitamin E, magnesium), and Brazil nuts (selenium — one per day is enough).
4. Choose unsalted or lightly salted; heavy salting masks palatability that supports mindful eating.

Evidence

Nut consumption is associated with lower depression risk and reduced inflammatory markers in multiple large cohort studies. The PREDIMED trial found nut supplementation reduced cardiovascular events; mood was a secondary finding. Nut micronutrient content and known roles in neurotransmission provide a plausible mechanism. (observational)

Nuts are calorie-dense; most benefit evidence assumes unsalted, unprocessed nuts, not roasted-in-oil salted varieties.

Sources

• Estruch et al. (2013), PREDIMED trial, New England Journal of Medicine

Common mistake

Treating peanuts (technically a legume) as equivalent to tree nuts for brain micronutrients — peanuts are healthy but have a different fat and micronutrient profile.