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Exercise is a critical component of many weight loss regimens and it often accompanies restrictive diets, thereby potentially confounding the relationship between diet and T in any study. Indeed, Kumagai et al found that aerobic exercise positively correlated with the T levels, even more so than caloric restriction (reference 2 in comment). However, these results were restricted to a population of obese men and uncontrolled with respect to BMI, which may not translate to the nonobese population. In this study we controlled for the potential effect of exercise on serum T and yet we acknowledge that the characterization of physical activity was not traditional. Even with this less stringent characterization of vigorous physical activity, controlling for exercise should have minimized its effect as a potential confounder and shed light on the relationship between diet and T. We hope that these data will help physicians better understand the complex relationships among diet, T and overall health. Ultimately restrictive diets are just one of the many lifestyle modifications which can affect serum T. These considerations should be weighed on an individual basis when counseling patients regarding serum T and overall health (reference 6 in article). 404 POPULAR DIETS AND SERUM TESTOSTERONE