Women aren't the only ones affected by depleting hormones. An estimated 4 million U.S. men have low levels of testosterone, a downward slide that begins at about age 40 [source: Brody]. Roughly equivalent to female menopause, the male version is dubbed "andropause" or "male menopause," and can wreak havoc on a man's weight, energy levels, moods and sex drive. Late-stage andropause, which occurs after age 70, may also signal the progression of Alzheimer's disease or even the penchant to develop age-related memory problems [source: Boyles].
Replacing testosterone with synthetic hormone medications is an option, but it's not a simple fix. In 2009, a federally financed study of men using testosterone gel screeched to a halt when a high rate of cardiac complications cropped up. In 2010, a $45 million study by the National Institute on Aging is studying testosterone treatments [source: Brody]. Pending any research-related revelations, men can turn to exercise and other lifestyle changes to help reduce weight, which can help them utilize testosterone more efficiently.