HEALTH NEWS   ·         Researchers discover why taking a mushroom supplement slows or prevents prostate cancer from getting worse ·         New study explores the role of BMI in disease risk ·         Higher vitamin C levels associated with lower risk of stomach cancer  ·         Vitamin D supplements may lower blood pressure in older people with obesity ·         Biochemical and physical effects of exercise could help heal nerves ·         Can everyday physical activity improve cognitive health in middle age?