The Nation - News from May 21, 1987

Providing new evidence that moderate exercise is good but too much may be unhealthy, researchers reported that highly trained male runners have a hormonal abnormality found in patients with depression and anorexia nervosa. The researchers at the National Institute of Child Health and Human Development in Bethesda, Md., said the findings indicate those who run more than 45 miles a week should consider cutting back, even though more study is needed to confirm that intense athletic conditioning causes the abnormality.