Energy requirements were determined for 217 healthy , weight-stable men and women [ aged > 21 to < 50 y ; 70 % female , 77 % white ; body mass index ( BMI ; in kg/m ( 2 ) ) 22 to < 28 ; 52 % overweight ] over 28 d with 2 consecutive 14-d DLW assessments in addition to serial measures of body weight and fat-free mass and fat mass by dual-energy X-ray absorptiometry .