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ZOE Science & Nutrition · July 2, 2026 · 1h 1m

How to build a better brain: The 5 foods you need to protect your memory, mood and to cut dementia risk

Prof Felice Jacka, Prof. Tim Spector
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Felice Jacka and Tim Spector explore how diet and the gut microbiome affect brain health, mood, and dementia risk, drawing on research involving over 10 million people. They explain the mechanisms by which food influences the brain through inflammation and microbial pathways, identify which foods support brain health versus harm it, and offer practical, affordable dietary strategies for protecting cognition and mental health.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Canon

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Diet influences brain function through the gut microbiome and inflammation12:45
What you eat shapes your brain's function and structure via two mechanisms: the gut microbiota (which produces neurotransmitters and inflammatory signals) and systemic inflammation that crosses the blood-brain barrier.
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Diet-based remission of depression is clinically documented10:10
Clinical trials show that dietary intervention can put depression into remission in a substantial proportion of patients, often matching or exceeding the effect of medication alone.
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Curious

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Gut dysbiosis is a marker and driver of mental illness17:55
People with depression, anxiety, and cognitive decline show consistent patterns of reduced microbial diversity and missing bacterial species compared to healthy controls.
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Highlights

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Beans and legumes change brain function and mood more effectively than refined carbohydrates03:10
In clinical comparisons, whole food legumes (beans, lentils) produce measurable improvements in mood and cognition, while refined carbohydrates and ultra-processed foods do not.
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Fermented foods and dietary diversity rebuild the microbiota and protect the brain20:16
Eating fermented foods (sauerkraut, kimchi, yogurt, tempeh) and a wide variety of whole plant foods restores microbial diversity and produces measurable improvements in mood and cognition.
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References

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Brain Changer: How Diet Can Save Your Life — Felice Jacka — Foundational work on nutritional psychiatry and food's impact on mental health

Misc

✧Jacka pioneered the field of nutritional psychiatry — the intersection of diet and mental health
✧Research base: over 10 million people across clinical trials
✧Beans emerge as a mood-supporting food, outperforming cake in clinical outcomes
✧Ultra-processed foods implicated in depression and cognitive decline
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