From a medicinal point of view apples are noted to be high in fibre and have a substance called pectin in their structure which helps to lower cholesterol. One french study examined the effects of eating 2-3 apples/day for a month on a group of healthy middle aged men and women and HDL (good cholesterol) was noted to rise. By contrast LDL (bad cholesterol) fell in 80%of the group; falling by 10% in 50% of the group. Interestingly enough the apple/cholesterol effects seemed to have a greater impact on women. With one woman 's cholesterol falling by 30%.
In addition apples are moderately high in salicylates which have pain relieving properties and have also been found to have anti-viral properties. So there maybe something in the old adage - "an apple a day keeps the doctor away".