Dr. Lee said because the basis of IOM's findings have been questioned, she and other researchers decided to look at the issue within the group of women participating in the federal Women's Health Study. She also said the goal was to look at women who weren't dieting and were consuming a normal diet to see what impact physical activity has on weight.

Lee说，由于美国医学研究所研究结果的基础受到了质疑，她和其他研究人员决定在参与了“联邦女性健康研究项目”的女性人群中考察这个问题。她还说，目的是对没有节食、饮食正常的女性进行研究，考察体育运动对体重会造成怎样的影响。

Overall, women gained an average of 5.7 pounds in the study. However, those who were normal weight, with a body-mass index of less than 25, maintained their weight if they exercised for 60 minutes a day. Women who exercised less generally gained weight. Dr. Lee said for overweight or obese women, 60 minutes of exercise a day wasn't enough to maintain weight, suggesting calories need to be cut.

总体来讲，研究期间这些女性的体重平均增加了5.7磅。不过，那些体重正常、体重指数(BMI)不到25的女性，如果每天锻炼60分钟，得以保持体重。运动量较少的女性体重往往会增加。Lee说，对体重超重或肥胖的女性来说，每天锻炼60分钟是不足以保持体重的，她建议要减少热量的摄入。