Testosterone Not the Whole Story in 'Male Menopause'

Recommended by Dr. Michael White, Updated on January 21st, 2018
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By Amy Norton HealthDay Reporter

WEDNESDAY, Sept. 11 (HealthDay News) -- Symptoms of so-called "andropause" -- the male equivalent of menopause -- may be triggered not only by declines in testosterone, but in the "female" hormone estrogen as well, a new study suggests.

Experts said the study, published in the Sept. 12 issue of the New England Journal of Medicine, deepens researchers' understanding of the hormonal shifts that occur as men age.

And it's more complicated than those ads about "low T" and testosterone supplements might lead men to believe.

Instead, researchers found, there is no black-and-white cutoff for "low" or "suboptimal" testosterone. Different symptoms crop up at different testosterone thresholds: Muscle mass and strength do not decline until testosterone drops quite low, whereas libido may dampen with relatively small dips in the hormone.

"The question that patients always have is, 'What's a normal testosterone level?'" said Dr. John Amory, a professor of medicine at the University of Washington in Seattle, who was not involved in the study.

"Well, now I'm going to ask, 'What endpoint are you talking about?'" Amory said. "Different functions of testosterone start to deteriorate at different levels."

What's more, the study shows that men's functioning can be impaired not only by a loss of testosterone, but estrogen as well, according to lead researcher Dr. Joel Finkelstein, associate director of the Bone Density Center at Massachusetts General Hospital in Boston.

A small amount of the testosterone men produce is converted into estrogen in the body, so that hormone also declines as men get older.

And in this study, estrogen and testosterone loss both affected men's libido and erectile function. And it was the loss of estrogen, in particular, that appeared to promote body fat gain.

Read more:
Testosterone Not the Whole Story in 'Male Menopause'

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