Watermelon
Originating in Africa, watermelon is high in water content, vitamin A and C and very low in calories. Although a poor fiber source, it is not only good as a refreshing snack in summer, but is one of the richest foods in lycopene (even more than tomatoes, giving it its pink color) and citrulline. While lycopene can improve heart health, lower cholesterol and protect from cancer, citrulline is an amino acid responsible for lowering blood pressure and can be used to treat muscle soreness.