However, the expression of regulatory genes that are critical for the fatty acid metabolism of the primary energy source in healthy adult hearts,56, 57, 58 such as medium‐chain acyl‐CoA dehydrogenase, lipoprotein lipase, peroxisome proliferator‐activated receptor alpha and gamma, and the glucose uptake and utilization regulation gene solute carrier family 2 member 456, 59 were found to be increased in exercise MI hearts compared with sedentary hearts (data not shown). The gene discussed is SLC2A2; the disease is myocardial infarction.