Normal-weight and obese non-Hispanic black children ( n = 100 ) aged 5-6 years were observed in four dinner conditions of varying portion size ; portions of all foods ( except milk ) offered were : 100 % ( 677 kcal ) , 150 % ( 1015 kcal ) , 200 % ( 1353 kcal ) , or 250 % ( 1691 kcal ) of those in the reference condition ( 100 % ) .