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a Mean (±SEM) plasma glucose and b insulin concentrations following ingestion of 20 g of intrinsically l-[1-13C]phenylalanine-labeled protein plus 40 g of carbohydrate in healthy young (n = 12) and older (n = 12) men. a Significant time (P < 0.0001), group (P < 0.0001), and time*group interaction (P < 0.0001) effect. b Significant time (P < 0.0001), group (P < 0.0001), and time*group interaction (P < 0.0001) effect. * = P < 0.05 compared with corresponding time point in the Young group
