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A. Testosterone May Protect Older Men's Brains

Narrator: This is Science Today. A recent study has demonstrated that older men with higher levels of testosterone have better brain function than men with lower levels. Kristine Yaffe of the University of California, San Francisco, says the research involved men over the age of 65.

Yaffe: We did a series of cognitive assessments-so we did a number of very standardized cognitive tests-and then we measured their sex hormones in the body. And it turned out that the men who had the higher levels of testosterone did much better on the cognitive tests-on all three of the cognitive tests we administered-than men who had the lower levels.

Narrator: Yaffe says the findings suggest that taking testosterone supplements may protect the brain from diseases like Alzheimer's. But she adds that future clinical trials are needed to determine if such supplements would benefit the brain over time.

Yaffe: Our data is preliminary. I would caution people from taking drugs, over the counter or prescription, specifically to help with their memory or prevent Alzheimer's based on our results.

Narrator: For Science Today, I'm Larissa Branin.