Blueberries contain powerful antioxidants to reduce oxidative tension, which is the main trait of this mental illness. They also support the growth of new cells. Which is another way of treating depression. So in case struggle with mental illness like depression and/or dark, gloomy thoughts, make sure to add them to your diet. How? You can eat them as a (healthy) snack, but adding them to your pancakes, smoothie, or yogurt in the morning is also a great option.