A study by researchers in the UK found hunger hormones were affected differently depending on the type of exercise. Resistance training and aerobic exercise were compared in a small group of healthy males in which three 8-hour sessions monitored ghrelin and peptide YY during exercise and two meals.
Aerobic exercise beat out strength training for suppressing hunger. Specifically, ghrelin, a hunger-stimulating hormone, decreased and peptide YY, which suppresses hunger, increased during aerobic exercise. Though strength training also decreased hunger, it only lowered ghrelin, while peptide YY did not change significantly. The effect of the hormone changes lasted about two hours.