This #mentalhealthday❤️ @healthhatch pledges to help people with #dépression fight naturally.. . Foods like Milk, papaya, sweet potato , spinach, dudhi /bottle gourd are a good source of tryptophan (a type of amino acid) which in the body gets converted to serotonin thereby lowering depression. Besides food, exercise also plays an important role in fighting depression. . Serotonin is a neurotransmitter that helps regulate mood and social behavior, appetite and digestion, sleep etc. In depression the level of serotonin falls . So people with depression are given drugs that boost serotonin.