When the federal government unveiled the controversial 2025-2030 Dietary Guidelines for Americans in January, nutrition scientists cried foul. A talk by one of the nation's leading food policy critics will help explain the ramifications of the new guidance.
Marion Nestle
Marion Nestle, a professor emerita at New York University, will unpack how politics, industry influence and ideology reshaped America's food advice - and why it matters far beyond the dinner plate. Her talk, "Food Politics in the Trump Era: The 2025-2030 Dietary Guidelines for Americans," is scheduled for March 19, 4-5 p.m. in Schurman Hall, Lecture Hall 4/5.
Light refreshments will be available at 3:30 p.m.; the event is free and open to the public.
Hosted by Cornell Public Health, Nestle's talk comes as federal nutrition guidance is under unusual scrutiny. The new guidelines not only set aside key recommendations from the administration's own independent scientific advisory committee, but also replaced the familiar MyPlate graphic with an inverted food pyramid emphasizing meat and full-fat dairy. Supporters have praised the guidelines' sharper stance against ultra-processed foods and added sugars.
Critics, however, argue that the process departed from long-standing norms of scientific transparency and independence.
"Bottom line, these new guidelines represent a political message, not a scientific one," Nestle said. "What raises red flags is when they are saying, 'Everything you ever knew about nutrition is wrong.' You have to roll your eyes."
Every five years, the Dietary Guidelines for Americans are updated through a process that has traditionally relied on a comprehensive review of evidence, conducted by an independent Dietary Guidelines Advisory Committee. For the 2025-2030 edition, a 20-member committee spent two years evaluating research on diet, chronic disease and health equity before submitting a detailed scientific report in December 2024. Yet many of the committee's recommendations were not incorporated into the final document.
Administration officials cited objections to the committee's use of a health equity lens in evaluating evidence, contending that the guidelines should focus strictly on dietary science. The final document also omitted discussion of environmental sustainability, an area that has gained prominence in global nutrition policy conversations. In response, nutrition scientists and major health organizations have raised concerns about a lack of transparency in how the final guidelines were written, as well as reported financial ties between some supplemental reviewers and the beef and dairy industries.
"There's evidence that there was immense lobbying around these guidelines," Nestle said. "The message is that you are responsible for your own health and you need to make your own decisions about it regardless of what the science says. I don't think that's a helpful message."
Nestle has been a central voice in these debates for decades. The Paulette Goddard Professor Emerita of Nutrition, Food Studies, and Public Health at New York University and a visiting professor in the Division of Nutritional Sciences at Cornell University, she previously served as senior nutrition policy advisor at the U.S. Department of Health and Human Services, and was managing editor of the 1988 Surgeon General's Report on Nutrition and Health.
Her landmark book, "Food Politics: How the Food Industry Influences Nutrition and Health," helped establish critical nutrition policy as a field of scholarship, and her widely read blog continues to analyze how corporate power and political ideology shape dietary advice. In recent commentary, she has described the new guidelines as "cheerful, muddled, contradictory, ideological, retro."
The stakes of the guidelines extend well beyond personal choice. Updated every five years, they form the foundation for federal feeding programs, including school meals, military rations and programs serving older adults - directly affecting roughly one in four Americans. They also influence food industry reformulation strategies, agricultural production priorities and public health messaging nationwide.
For Cornell audiences, the implications resonate across disciplines. Federal dietary guidance shapes demand for specific agricultural commodities, which in turn affects livestock production, land use, environmental sustainability and ecosystem health, issues central to the College of Veterinary Medicine and other units engaged in food systems research. Understanding how scientific evidence is translated - or sidelined - in policymaking is critical for researchers and students working at the intersection of food, health and the environment.
Nestle's seminar will examine how political narratives, industry lobbying and shifting cultural attitudes toward diet converged in the 2025-2030 guidelines. She is expected to explore what happens when dietary advice becomes entangled with ideology, and what that means for public trust in science-based policymaking. As debates over the role of evidence in federal decision-making intensify, her analysis aims to illuminate who ultimately shapes national nutrition policy, and whose interests it serves.
"The public should be reminded of Michael Pollan's mantra: Eat food. Not too much. Mostly plants," Nestle said. "He said it in seven words. I wrote a new book about it and said it in 700 pages."
