You’ll recognize Marion Nestle, PhD, as author of several books about food security, including Food Politics: How the Food Industry Influences Nutrition and Health (University of California Press, 2002), Safe Food: The Politics of Food Safety (University of California Press, 2003), and What to Eat (North Point Press, 2006). She also serves as the Paulette Goddard Professor in the Department of Nutrition, Food Studies and Public Health at New York University and teaches sociology at NYU and nutritional sciences at Cornell University.

Nestle speaks around the world about food insecurity, obesity and food safety. Urban Farm caught up with her at The Precarious Alliance Symposium at Delaware Valley College in Doylestown, Pa., where she delivered a presentation called “Choking on Our Failing Food System,” giving the audience a real look at how modern agricultural and food-processing systems impact the environment, our access to nutrition and social equity.

Watch the video above for Nestle’s opinions about a sustainable food system, and hear more from her in the monthly “Food Matters” column in the San Francisco Chronicle and on her blog.