Michael Greger: Do Vegetarians Have More or Less Depression and Anxiety?

Key Takeaways

• Eat more Mediterranean or plant-based foods (fruits, vegetables, fermented foods, nuts, fiber, plant-based protein/fats, polyphenols) to support gut microbiome and mental health.
• Avoid Western diet components (ultra-processed foods, animal protein/fat, saturated fat, sweeteners, emulsifiers) linked to higher depression risk.
• Focus on strict plant-based diets (vegan/lacto-ovo vegetarian) rather than semi-vegetarian/flexitarian diets, which may correlate with higher depression rates.
• Consider geographical and study quality factors – associations between vegetarianism and mental health vary by region and research rigor.

Notable Quotes

“Fecal transplant studies found that feeding rats feces from depressed people induces depression-like behavior.”

“Dietary factors that help our good gut bugs include eating more Mediterranean, more plant-based, fruits and vegetables, fermented foods, nuts, fiber, and other prebiotics.”

Bottom Line

Prioritize a whole-food, strictly plant-based diet to potentially improve mental health, while avoiding processed foods and animal products. More high-quality longitudinal studies are needed to confirm causation.

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