Take care of your heart - treatment of high blood pressure, high cholesterol, diabetes and obesity is necessary for good heart health and is likely also to protect brain health. Increase physical activity to the World Health Organisation (WHO) recommended 30 minutes a day for adults and eat a healthy Mediterranean-style diet, high in omega 3, polyunsaturated and monounsaturated fats - found in fish and olive oil. Limiting the intake of saturated and trans fats, which are often found in take-away and sweets, can also lower the dementia risk.