Apples belong to the Rose family of plants and are joined in that family by a wide range of very popular foods, including apricots, plums, cherries, peaches, pears, raspberries, and almonds.
Foods in the Rose family are simply too diverse in their nutrient value to allow for any one single recommendation about the number of servings that we should consume from this family on a weekly basis.
However, when focusing specifically on apples, several anti-cancer studies show daily intake of this fruit to provide better anti-cancer benefits than lesser amounts.
So there may be some truth to that old phrase, "An apple a day keeps the doctor away!" Still, we don't recommend that everyone eat one apple on a daily basis, given the wide variety of available fruits and the nutritional uniqueness of each type.
But we do recommend that everyone eat at least 2-3 whole fresh fruits per day, or the equivalent of 2-3 cups' worth of fresh fruit.
Within this framework, if apples are a type of fruit that you strongly prefer, there would be nothing wrong with consuming one on a daily basis, and you may get some special health benefits by doing so.
Apple, fresh
1.00 medium
(182.00 grams)
Calories: 95
GI: low
Nutrient DRI/DV
fiber17%
vitamin C11%
This chart graphically details the %DV that a serving of Apples provides for each of the nutrients of which it is a good, very good, or excellent source according to the Food Rating System. Source is here.