Need a mood booster? Scientists say that working omega-3 fatty acids into your diets can stabilize your mental health. Of course, you can find them in fish; in fact, a New Zealand study revealed that eating fish was linked to positive mental health, even when other factors that could influence the results were adjusted for. Also, new mothers who eat less fish were found to have higher rates of postpartum depression. You can also find plant foods that are rich in omega-3 fatty acids, like flaxseed, cauliflower, and broccoli.