Apples can be eaten fresh, cooked or dried, they are low in kilojoules and are a good source of vitamin C, which makes them a good choice for a healthy snack. When using fresh sliced apple, the surface will go brown as oxygen from the air reacts with an enzyme in the apple flesh. This reaction can be stopped by cooking the apple or brushing with lemon juice, drying the apple slices will also kill the enzyme. Apples are high in fibre, including soluble fibre. Packed with numerous phytochemicals such as quercetin that is know to help prevent heart disease and cancer. Purchase organic if possible, apples should always be washed before eating, if they have been waxed it's best to peel them as it will prevent pesticide residues from being washed off.