APPARENTLY, LOW TESTOSTERONE IS BAD FOR COGNITION: Prostate cancer treatment linked to heightened Alzheimer’s risk. “Soon after a man is diagnosed with prostate cancer, drugs that lower levels of testosterone are often offered as treatment, since testosterone fuels the cancer’s growth. But a major new study suggests that this approach might have an unwanted side effect: Higher odds for Alzheimer’s disease and other dementias.”

Actually, the evidence that testosterone “fuels” prostate cancer is rather weak, and I have a friend with low-grade prostate cancer who has actually continued testosterone supplementation for several years with no problems. As I understand it, the thinking now is that it’s actually estrogen that’s the culprit. Lowering testosterone lowers estrogen in men, because men make their estrogen from testosterone, but it’s a drastic way compared to administering estrogen blockers.