Ten lean men [ mean SD age : 30.7 9.7 y ; body mass index ( in kg/m ( 2 ) ) : 23.2 2.8 ] consumed a whey protein and polydextrose ( PPX ) snack bar or an isoenergetic control snack bar as a midmorning , between-meal snack for 14 consecutive days in a double-blind , randomized , crossover design .