You are what you eat; the worse food you put in your body, the worse you will feel. You need to consume foods that are rich is omega 3 fatty acids. People who low on them may be more susceptible to depression, studies have shown. Choose oats over cereal because of their low glycemic index, which means they slowly release energy into the bloodstream and blood sugar and mood stable. Good food choices include nuts, lentils, fish, beans, bananas, berries, spinach, and beef.