Apples are high in vitamin C and fiber. They also have a large number of antioxidants.u003cbr/u003eu003cbr/u003eA medium-sized apple has about 52 calories in it and is mainly carbohydrates and water. They are also rich in naturally occurring sugars.u003cbr/u003eu003cbr/u003eTheir high fiber and low amount of calories make apples a popular diet food.