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New research from Massachusetts General Hospital found that during “male menopause,” a small amount of men’s testosterone is converted into estrogen.
The ratio is proportionate to the amount of testosterone: the higher the levels, the more that’s converted into estrogen.
The Question
Knowing that men with low testosterone levels also have low estrogen levels, the question the researchers wanted answered was whether adverse changes—such as weight gain, lowered libido and erectile dysfunction—were because of the decreased testosterone, estrogen or both.
The Study
The research team looked at about 150 men between 20 and 50 for 16 weeks. Half the men received either a placebo or daily doses of testosterone gel (at various dosage levels).
The other half of the men received the same testosterone dosages but with the addition of an inhibitor that kept the testosterone from being converted into estrogen.
The Results
The men who received no estrogen inhibitor experienced increases in body fat.
Low testosterone levels led to decreases in leg strength, lean body mass and the size of thigh muscle.
Libido was proportionate to the amount of testosterone the men received; the more testosterone the greater the sexual desire.
Erectile dysfunction only occurred when testosterone levels were very low.
But things were different for the men who received estrogen production blockers. Their fat increased at all levels of testosterone dosages, as did their sexual function.
The experts were surprised by the findings, which may change the way men are treated for sexual dysfunction.
“The biggest surprise was that some of the symptoms routinely attributed to testosterone deficiency are actually partially or almost exclusively caused by the decline in estrogen that is an inseparable result of lower testosterone levels,” says Joel Finklestein of the Endocrine Unite at Massachusetts General Hospital and associate professor of medicine at Harvard Medical School.

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