11 male university students participated in three types of sessions. In one, they ran for 60 minutes on a treadmill. In another, they did 90 minutes of weight lifting. In the third session, they did no exercise. During the treadmill session hormone levels changed and suppressed appetite. Both types of exercise suppressed hunger, but aerobic exercise (treadmill) resulted in greater suppression of hunger. The U.K. researchers say these findings may lead to more effective ways to control weight.