Higher levels of testosterone linked to diabetes risk

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Higher levels of the hormone testosterone, specifically an unnatural overabundance, is linked to increased diabetes risk and prostate enlargement, a new study says.

According to the researchers, this has important implications for millions of men, who use testosterone supplements to counteract low testosterone. They may be putting themselves at risk for benign prostatic hyperplasia (BPH) -- or, simply, prostate enlargement.

Building on previous research they conducted with the Tsimane, an isolated indigenous population in central Bolivia, the researchers examined the prevalence of BPH among a group of approximately 350 adult males.

Within that group, advanced cases of prostate enlargement were practically non-existent. As a correlating factor, the Tsimane also have relatively low levels of testosterone that remain constant over their lives.

"Abdominal ultrasounds show they have significantly smaller prostates -- an age-adjusted 62 percent smaller prostate size -- as compared to men in the US.," said the paper's lead author Benjamin Trumble from University of California, Santa Barbara.

"BPH is not inevitable for Tsimane men," Trumble said.

"We also know testosterone and androgens are involved because of studies showing that eunuchs and people who don't have testes have very low rates of BPH," Trumble added.

Despite having low testosterone overall, Tsimane men with higher testosterone levels (but still significantly lower than those of men in industrial populations) have larger prostates.

In addition to measuring prostate size, the researchers looked at the levels of glycated haemoglobin in the subjects' blood. Glycated haemoglobin -- HbA1c -- is a measure of long-term glucose exposure that in turn indicates the risk of diabetes.

"Despite having subclinical levels of HbA1c, men with higher HbA1c had larger prostates," Trumble pointed out.

The findings appeared in the Journals of Gerontology: Medical Sciences.