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The effects of variable meal size (left) and energy availability (right) on the plasma concentrations of FFAs (top) and β-hydroxybutyrate (bottom) under the experimental conditions described in Fig. 1. FFA and ketone body concentrations increased to exercise energy expenditure (Fdf4,36 = 10.1, P < 0.0001; and Fdf4,36 = 19.23, P < 0.0001, respectively), but not to the different meal size, and these increases were abolished by TPN.
