Body weight change at 6 months did not significantly differ at the 5 % level by experimental group ( 1,600 kcal group : +1.1 kg ( SD = 0.44 ) ; 800 kcal group : -0.1 kg ( SD = 0.42 ) ; 400 kcal group : -0.1 kg ( SD = 0.43 ) ; control group : 1.1 ( SD = 0.42 ) ; P = 0.07 ) .