Chief Medical Officer of Northwestern Medicine’s Northwest region of hospitals Dr. Irfan Hafiz joins Wendy Snyder (in for Bob Sirott) to talk about a rise in flu cases, the benefits of cutting saturated fats our of your diet, a study that links cheese to a lower dementia risk, and how many hours of sleep we actually need. He also explains what AFib is, the rise in whooping cough cases among kids, and how to manage your mental health during the holidays.