Plasma FGF21 concentration. FGF21, fibroblast growth factor 21. Con, LPHF, and HPHF represent chow diet, low-protein high-fat diet, and high-protein high-fat diet, respectively. Sed, sedentary behavior; T, training. Feed, training, and interaction indicate a dominant effect of diet, treadmill exercise, and the interactive effect between feed and training, respectively. n.s., no significance was observed. * p < 0.05 and *** p < 0.001. @, p < 0.05; &, p < 0.01; #, p < 0.001. Data are presented as the mean ± SD. n = 8 for each group. Significance in the differences between means was determined by Tukey’s post hoc test when ANOVA revealed a significant effect from interaction of diet and training.