After a 4-wk baseline diet [ 55 % E carbohydrate , 15 % E protein , 30 % E fat ( 7 % E SF ) ] , participants were randomly assigned to 4 wk of either the baseline diet or 1 of 4 test diets containing 35 % E carbohydrate and either 20 % E or 30 % E protein and either 7 % E or 15 % E SF .