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An apple a day may keep extra pounds away, according to research that shows this fruit contains filling soluble fiber as well as ursolic acid, a natural compound that has been found to boost fat burning and which may promote lean muscle mass. In one study, researchers from the University of Iowa note that animals given ursolic acid supplements increased their muscle mass and energy expenditure (or calorie burn). And a study that was done on people and published in the journal Appetite shows that women who added three small apples (total calorie cost: 200) to their diet per day lost a little more than two pounds in 10 weeks — more than dieters who did not include the fruit in their diet.
A medium apple has 95 calories and 6 grams of fiber; a small apple has 75 calories and 3.5 grams of fiber. Be sure to eat the whole apple, as the ursolic acid as well as beneficial antioxidants are concentrated in the skin.