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Low Testosterone Might Shorten Men's Lives
Date:11/27/2007

Study finds it's linked to higher death risk, but replacing the hormone may not help, experts say

TUESDAY, Nov. 27 (HealthDay News) -- Men aged 40 or over with low levels of testosterone may be at increased risk of fatal heart attacks or death from any cause, a British study suggests.

In fact, "The magnitude of the effect was very similar to that of [high] cholesterol or blood pressure," said lead researcher Dr. Kay-Tee Khaw, professor of clinical gerontology at the University of Cambridge School of Clinical Medicine.

However, more work is needed to see whether testosterone supplements should be recommended for men with naturally low levels of the hormone, she said.

"We need to replicate these findings," Khaw said. "We hope we can entice other investigators to look at testosterone levels and see if these findings are confirmed."

Her team published the findings in the Nov. 27 issue of Circulation.

The study included more than 11,600 men ages 40 to 79 who were free of known cardiovascular disease and cancer at the start of the trial. It was done because "there have been lots of studies suggesting that low testosterone may not be good for health," Khaw said. "So, we wanted to see if this could be demonstrated in a large population. Testosterone is hard to measure, the test can be expensive."

The men were divided into four groups based on their blood testosterone levels.

Those men in the highest quarter of testosterone readings -- with at least 19.6 nanomoles of the hormone per liter of blood -- had a 41 percent lower risk of dying over 10 years than those in the lowest quarter of testosterone readings -- less than 12.5 nanomoles of testosterone per liter of blood.

One major question is whether low testosterone is a risk factor itself or just a marker for other risk factors, said Dr. Victor Montori, associate professor of medicine at the Mayo Clinic in Rocheste
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