寻一篇有关“过度运动对身体有害”的英语小短文,150字左右

Excessive exercise is one of the general warning signs of an eating disorder,but the problem may be particularly common among anorexic women who vomit or use laxatives to lose weight,a study shows.
Women such as these may be at particular risk of dangerously low weight and potentially fatal consequences,according to the study authors.Targeting the anxiety and obsessive tendencies so common in these women might aid in treating the eating disorder,they report in the International Journal of Eating Disorders.
Doctors have known that excessive exercise is a common feature of eating disorders like anorexia and bulimia,but it hasn't been clear which women are most likely to have the problem.
For the current study,researchers led by Dr.Cynthia M.Bulik of the University of North Carolina-Chapel Hill used data from three international studies of women with anorexia,bulimia or both.
The women completed standard questionnaires on eating disorder symptoms,personality traits and exercise habits.Excessive exercise was defined as exercising more than 3 hours a day or being otherwise obsessed with daily physical activity - letting it interfere with other aspects of life,for example,or exercising even when injured or ill.
Although excessive exercise was common regardless of the type of eating disorder,the study found,it was most common among anorexic women who purged.Of these 336 women,more than half exercised excessively.