( 1 ) A high-glycemic index ( 65 % on the glucose scale ) , high-carbohydrate diet ( 58 % energy ) ; ( 2 ) a low-glycemic index ( 40 % ) , high-carbohydrate diet ; ( 3 ) a high-glycemic index , low-carbohydrate diet ( 40 % energy ) ; and ( 4 ) a low-glycemic index , low-carbohydrate diet .