TABLE 3

Energy balance and changes in body weight and body energy stores during 2 weeks of refeeding on isocaloric amounts of low-fat and high-fat diets

C-LFC-HFRF-LFRF-HFANOVA
GroupDietGroup × diet
Weight gain (g)99 ± 9102 ± 5114 ± 6120 ± 2P < 0.02NSNS
Fat gain (g)9.7 ± 1.214.3 ± 1.2*19.8 ± 1.030.3 ± 1.5P < 0.001P < 0.001P < 0.05
Protein gain (g)15.3 ± 0.716.0 ± 0.716.7 ± 0.816.3 ± 0.8NSNSNS
Energy gain (kJ)722 ± 41914 ± 56*1,144 ± 381,540 ± 58P < 0.001P < 0.001P < 0.05
ME intake (kJ)4,632 ± 324,652 ± 154,641 ± 254,624 ± 32NSNSNS
Energy expenditure (kJ)3910 ± 293,738 ± 48*3,497 ± 273,084 ± 45P < 0.001P < 0.001P < 0.01
Efficiency (%)15.6 ± 0.819.6 ± 1.2*24.6 ± 0.733.3 ± 1.1P < 0.001P < 0.001P < 0.05
Adjusted energy expenditure (kJ)3,775 ± 413,649 ± 553,217 ± 382,895 ± 52P < 0.001P < 0.001P = 0.05
  • Data are means ± SE. C-LF and C-HF, control groups fed a low-fat or high-fat diet, respectively; RF-LF and RF-HF, RF groups consuming a low-fat or high-fat diet, respectively. ME intake refers to metabolizable energy intake and was determined from differences between gross energy intake and the energy lost through feces and urine, as reported previously (29). Adjusted energy expenditure is calculated as the difference between energy expenditure and the energy cost of fat gain on a low-fat diet (0.36 kJ/kJ fat gain) or high-fat diet (0.16 kJ/kJ fat gain). Within controls or RF groups, statistical differences between groups consuming low-fat or high-fat diets are indicated as follows:

  • *

    * P < 0.05;

  • P < 0.001;

  • P < 0.01.