Chief Medical Officer of Northwestern Medicine’s Northwest region of hospitals Dr. Irfan Hafiz joins Bob Sirott to talk about an exercise to lessen pain in your knees, the benefits of cooking and eating salmon, as well as walking after a meal. He also discusses research on eating yogurt and the prevention of colon cancer, how a diet change could reduce the risk of tinnitus, and why you might be waking up during the night to use the bathroom.