Tomatoes are high in folic acid and alpha-lipoic acid, which are both helpful for fighting depression. According to one study, people with depression tend to be low in folate. In fact, one-third of patients with major depression had a folate deficiency. Folic acid works by preventing access homocysteine, which is a hormone that restricts the production of many vital neurotransmitters that make you feel good, such as norepinephrine, dopamine, and serotonin. Alpha-lipoic helps you convert glucose into energy to help stabilize mood. Add raw tomatoes to your salad at lunch or dip baby tomatoes in hummus as a snack.