Apples have less than 50 calories but are a great source of antioxidants, fiber, Vitamin C and potassium, according to &amp;lt;a href=&amp;quot;http://www.superfoodsrx.com&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;SuperFoodsRx.com&amp;lt;/a&amp;gt;. 