Lily is babysitting for a young set of twins. Their mother said that the pediatrician has advised that they stay away from sugar in order to get to a healthier weight. It’s snack time and one of the twins asks for a cookie. Lily says that since they are cutting sugar, maybe an apple would be better. The other twin rolls his eyes, telling Lily that he knows apples have sugar in them. How might Lily BEST explain why apple is a better choice?