Fig. 4. (A) Mass-specific resting metabolic rate (RMR), (B) lean-dry-mass-specific fat mass, (C) body-mass-specific pectoral muscle mass and (D) body-mass-specific intestinal mass in the three treatment groups. Different letters indicate significant differences between FR versus AL, and FR/AL versus AL groups only (Mann–Whitney U-tests). Horizontal lines denote median values, while boxes denote 25th and 75th centiles. The filled square denotes the outlying data point from the FR group (see Results). FR, FR/AL, food-restricted groups; AL, group fed ad libitum.