Many have heard of his brother, Deepak, but Dr. Sanjiv Chopra is an accomplished medical professional as well. He is a professor at Harvard Medical School, and is an expert on the GI tract and the liver. He is also an author, and today he talks with Commander Mark Divine about his most recent book, “The Big Five: Five Simple Things That You Can Do to Live a Longer, Healthier Life.” Are they really that simple? And how can you start using his tips in your own life?