List of most nutritious antioxidant fruits and their benefits. The fruit is very easy in getting and certainly will bring great benefits to the body,all provide real result. 1. Banana - Bananas are a great source of potassium (about 400 mg), which helps lower your risk of high blood pressure and stroke and plays a key role in muscle function.Bananas are delicious and sweet to eat, making them a good sugar substitute and natural energy source. The fiber in bananas helps restore normal bowel action. A medium size banana has around 108 calories. 2. Apples - .Apples, with the skin, provide pectin, 5 grams of fiber and a heaping dose of flavonoid antioxidants. Apple fiber helps lower cholesterol and keep you regular. And the powerful flavonoids reduce your risk of heart disease, stroke and cancer. A medium apple has about 80 calories.