We all need energy to function and we get this energy from the foods we eat. The most efficient way for cells to harvest energy stored in food is through cellular respiration, a catabolic pathway for the production of adenosine triphosphate (ATP). ATP, a high energy molecule, is expended by working cells.
An Apple a Day. The calories in a McIntosh apple depend on its size. According to the U.S. Department of Agriculture, a medium-sized apple with its skin has about 95 calories. Eating an unpeeled apple is moderately higher in calories than a peeled apple, but don't rush to peel your apple.
Calories in apple. Find nutritional information like calories, carbs, fat, protein and fiber for apple. Fresh Fruits : Apples with Skin, raw. Fresh Fruits : Granny Smith Apple, raw, with skin. Fresh Fruits : Gala Apple, raw, with skin. Fresh Fruits : Red Delicious Apple, raw, with skin. Fresh Fruits : Fuji Apple, raw, with skin.