Ketones changed markedly in response to exercise in the fasting state. Ketone bodies serve as a key energy substrate during fasting, especially for the brain1,39,40, but both skeletal and heart muscles oxidise ketones under hyperketonemia37,41. From the present cohort, we have previously reported a gradual increase in resting β-hydroxybutyrate (BHB)42, where plasma BHB was almost […]