A number of studies have demonstrated the strong link between a healthy diet and brain health, as well as all other chronic diseases. The basics are a diet focusing on whole, plant foods and minimizing processed foods, sweets and animal products high in saturated fats (dairy, meat and eggs).
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https://www.drjoelkahn.com/can-a-healthy-diet-slow-aging-and-reduce-dementia-risk-new-data-says-yes/