Kelly Brownell, director of Yale's Rudd Center for Food Policy and Obesity, continues his undergraduate course on the forces shaping what and how much people eat. This session in the lecture series examines how food marketing, industry lobbying, and government policy intersect with biological drives like hunger and taste preference to shape diet and body weight. Brownell draws on his research into obesity and public health to argue that individual willpower is a weak lever against an environment engineered to encourage overconsumption, citing advertising practices aimed at children and the political resistance to regulations like soda taxes. The lecture format is straightforward classroom instruction, delivered to a Yale undergraduate audience, with Brownell working through evidence from nutrition science, economics, and policy studies to build his case for treating diet as a public health problem rather than a purely personal one.