February is Heart Month, so in this week's podcast we're revisiting one of our most popular episodes: an in-depth look at dietary fat. We'll share tips for including more beneficial fats in your diet, plus we'll give you the bottom line on butter and health. You'll hear from two experts: Walter Willett, professor of epidemiology and nutrition at Harvard T.H. Chan School of Public Health, and Dariush Mozaffarian, dean of the Friedman School of Nutrition Science and Policy at Tufts University.