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
- Measure out a 30 g portion (roughly a small handful) rather than eating from the bag.
- Keep an unsealed container of mixed nuts at your desk or in your bag as the default snack.
- Rotate between walnuts (omega-3), almonds (vitamin E, magnesium), and Brazil nuts (selenium — one per day is enough).
- 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.
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More practices for The Mediterranean Diet for Mood and Wellbeing
- Use extra-virgin olive oil as your primary cooking fat
Replace seed oils and butter with extra-virgin olive oil for cooking and dressing.
- Eat fatty fish at least twice a week
Salmon, sardines, mackerel, or herring — two servings a week for brain-critical omega-3s.
- Eat legumes four or more times per week
Lentils, chickpeas, and beans as a core protein and fiber source — not a side dish.
- Aim for variety, not just quantity, in vegetables
Eating 30 or more different plant foods per week diversifies your gut microbiome more than volume alone.
- Choose whole grains and displace refined carbohydrates
Oats, barley, farro, and brown rice sustain energy and mood; white bread and pastries spike then crash both.
- Include fermented foods regularly
Yogurt, kefir, sauerkraut, and kimchi introduce live beneficial bacteria to the gut — the most direct microbiome intervention in food form.
- Reduce red and processed meat to occasional
The Mediterranean diet limits red meat to a few times per month — processed meat even less.