Mental health is one of the most important aspect of our health. Deficiency of almost all the nutrients affects our mental health directly or indirectly. Nutrients that directly affect mental health are: Omega-3 essential fatty acid, Vitamin B6, B12, proteins, carbohydrates and folic acid. Some of the foods which you can add to your diet to maintain a good mental health are: fish oil, nuts, avocado, milk, cheese and potatoes.