Nutritional psychiatrist Felice Jacka: ‘The global food system is the leading cause of early death’.

We usually think of food as having an effect on us from the mouth down. Why study its impact on our brain?
Our gut microbiome affects virtually every aspect of health. It affects our metabolism, our blood glucose, our body weight. It affects the way genes turn on and off, and the amount of serotonin in our brain by altering the way the gut breaks down tryptophan [from protein] in our diet. It influences the stress response system. It affects the way the [energy-producing] mitochondria in our cells work, and it very profoundly influences our immune system.

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