StrawberriesThese juicy, sweet berries are one of the most potent sources of vitamin C, which helps your body produce collagen, a structural protein that keeps skin youthful, firm, and radiant. Strawberries are also one of the lowest calorie (and lowest sugar) fruit options, which means they’re a perfect pick for people looking to lose a few pounds or manage diabetes. When they’re in peak season, enjoy them plain, sliced, and scattered on your cereal, or topped with a luxurious dollop of aerated whipped cream.