We read through hundreds of your questions and submitted some for Dr. Ronald Petersen, director of the Mayo Alzheimer's Disease Research Center and professor of neurology at the Mayo Clinic College of Medicine, to answer. His answers to viewers' most common questions are below.
Bruce from New Haven, Conn., asked: "The ABC story reports that 30+ minutes of exercrise several times/wk lessens the risk ofAlzheimer's. Aerobic exercise? What intensity of exercise? How measured -- by heart rate?"