Berries are the king of antioxidants. They contain a unique blend of antioxidants called anthocyanins, which have been shown to have antidepressant activities in clinical studies. Blueberries have been labeled as brain-boosters by reducing oxidative stress, improving memory, and lowering the risk of dementia. Make one cup of raspberries, blueberries, strawberries or blackberries the main component of your fruit smoothie. Add a handful to salads or eat them with walnuts for a mood-boosting snack.