In young subjects , a dose-responsive suppression ( SEM ) of energy intake was found at the buffet meal by protein ( suppression at @ kcal : @ @ % , P = @ ; @ kcal : @ @ % , P = @ ; @ kcal : @ @ % , P = @ ) , whereas suppression was observed only after the @-kcal load in older subjects ( @ kcal : @ @ % increase , P = @ ; @ kcal : @ @ % increase , P = @ ; @ kcal : @ @ % suppression , P = @ ) .