Diabetes can affect the Blaux portable ac endothelial cells of the blood vessels compounding the problem of lower testosterone levels. Over the past two decades, the level of testosterone in American males has decreased by 16 percent. Researchers don't know why. But there are some clues. The recent Nurses' Health Study revealed some important truths as they apply to women. Some of those truths also apply to the sexual health of men because they affect both hormonal levels and cardiovascular health. Additionally, as testosterone levels have decreased this has resulted in reduced muscle mass and tone, reduced metabolism Leptitox and energy and an increase in body fat.