Yale's undergraduate course The Psychology, Biology and Politics of Food continues with this lecture from the psychologist teaching it, part of a series that examines why humans eat the way they do and how food systems shape public health. The session works through the interplay of biological drives, such as hunger and taste preference, with psychological triggers like advertising and portion size, and situates both within the political economy of the food industry, including regulation, lobbying, and agricultural policy. Discussion draws on case studies of obesity trends and food marketing to children, treating eating behavior as a product of overlapping systems rather than individual willpower alone. The lecture format is a single continuous class session, with the instructor building on material from earlier weeks in the course. It runs at Yale's standard lecture length and assumes some familiarity with the course's recurring framework of biology, psychology, and politics as three lenses on the same problem.