Berries Blueberries. Raspberries. Strawberries. Blackberries. You name it. These are an incredible source of antioxidants. Dr. Sethi recalls one study done by the Journal of Nutritional and Environmental Medicine that said, "After two years, those who were treated with antioxidants had a significantly lower depression score." Not only that but berries are delicious, sweet, and refreshing, making them the perfect thing to snack on for a mood boost. Plus, the colors can only brighten your day. Image Source: Getty / Glasshouse Images