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.
Vitamins and Minerals in Apples. Apples are full of healthy antioxidants, fiber, vitamins and minerals. One medium sized apple contains 95 calories and 4.4 g of dietary fiber. In addition, an apple is a good source of potassium, phosphorus, calcium, manganese, magnesium, iron and zinc.Apples also contain vitamins A, B1, B2, B6, C, E, K, folate, and niacin. Apples come in different shapes and sizes, so the amount of calories and vitamins in 1 apple varies.Best of all, apples contain no fat, sodium or cholesterol.Anti-Carcinogenic Properties. Studies suggest apples might even work to fight cancer.pples come in different shapes and sizes, so the amount of calories and vitamins in 1 apple varies. Best of all, apples contain no fat, sodium or cholesterol. Anti-Carcinogenic Properties. Studies suggest apples might even work to fight cancer.