Apples are completely fat free and so are incapable of adding to your waistline. They are also free from sodium, so eating an apple a day contributes to a healthy blood pressure. Whole unpeeled apples (yes, ditch the peeler) contain lots of dietary fibre which is useful for a healthy digestive tracts. They also contain antioxidants thought to guard against heart disease, neurological diseases and even some forms of cancer.