DEAR DR. ROACH: I am a 78-year-old male in reasonably good health, but I do have some issues. I exercise daily and eat a fairly balanced, healthy diet. I am a Type 2 diabetic with an A1C of about 6.4% ...

Dr. Keith Roach is a physician at Weill Cornell Medical College and New York Presbyterian Hospital. He writes an educational column on infectious diseases, public health and sports medicine. DEAR DR.