MONDAY, July 8, 2019 (HealthDay News) -- 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. "Our results suggest that clinicians need to raise their awareness about potential long-term cognitive effects of hormone therapy and discuss these risks with their patients," said study author Ravishankar Jayadevappa. He's a research associate professor of geriatrics at the University of Pennsylvania's Perelman School of Medicine in Philadelphia. One expert said it does raise troubling questions. "Most of us are becoming as afraid...