Sixty Caucasian men and women [ BMI ( in kg/m ) : 18-25 or > 25 ; age : 18-50 y ] were included in a randomized placebo-controlled study in which fecal energy content ( FEC ) , fecal fat content ( FFC ) , resting energy expenditure , respiratory quotient ( RQ ) , body composition , and physical activity were measured twice ( baseline vs. week 12 ) .