Does exercise facilitate body weight control? The answer may depend on sex

"In a study conducted in rats, graduate student Rebecca Foright fed both male and female rats a high fat diet and then trained half of them to run on a treadmill. After a total of 10 weeks, there was a remarkable sex difference in response to the exercise training. Male rats who exercised ate less food and gained less weight than sedentary males. Exercising female rats did not reduce their food intake. At the end of the study they weighed the same as sedentary females. When this study was repeated in males fed a low fat diet, the research team found that the impact of exercise on body weight was evident even sooner than in the high fat diet fed male rats."