Figure 3A.Variation in basal and resting energy expenditure in (a) humans (b) MF1 mice as a function of fat-free mass and body mass respectively. Although fat-free mass and body mass explain a large amount of the individual variations in energy expenditure there is still considerable residual variation. (a: from Weyer et al. 2002, b: from Krol et al. 2003). In (a) individuals A and B have the same lean mass but differ in RMR by over 2 MJ/day.