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Introduction
Public nutrition policy plays a critical role in shaping population health through laws, guidelines, and programs that influence what people eat. In this episode, Emily Callahan, an expert in nutrition policy, talks about why public nutrition policies often fall short and what “success” looks like.
She discusses how evidence-based nutrition interventions can stall due to political or practical barriers, and explore examples ranging from federal food assistance programs to sodium reduction initiatives. Crucially, she addresses how to evaluate if a policy has worked and highlight emerging strategies (like integrating “food as medicine” into healthcare) that offer hope for better outcomes.
This conversation is highly relevant for researchers, clinicians, and nutrition professionals, as it underscores the importance of policy in addressing nutrition challenges at the population level and examines how to design effective, data-driven policies for public health impact.
Related resources
- Join the Sigma newsletter for free
- Subscribe to Sigma Nutrition Premium
- Enroll in the next cohort of our Applied Nutrition Literacy course
- JAMA Commentary: The MAHA Commission Report and Diet-Related Diseases in Youth – Mozaffarian, Callahan & Frist, 2025
- Mozafarrian et al., 2024 – “Food Is Medicine” Strategies for Nutrition Security and Cardiometabolic Health Equity: JACC State-of-the-Art Review
- Tufts’ Food Is Medicine Institute
- [05:09]Understanding public health nutrition policy
- [08:44]Examples of public nutrition policies
- [21:27]Challenges in implementing nutrition policies
- [31:24]Evaluating the success of nutrition policies
- [34:58]Sustainability and political viability of health policies
- [38:07]Food Is Medicine: a promising policy target
- [44:50]Medically tailored meals: evidence and implementation
- [48:55]The MAHA commission report and its implications
- [56:42]Future directions in nutrition policy
- [01:04:49]Key ideas segment (premium-only)
Guest Information
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Emily Callahan is the Founder and Principal of EAC Health and Nutrition, a consultancy that helps national health and science organizations evaluate and communicate research to educate stakeholders, shape environments, and advance policies to promote healthy eating and population health.
Emily primarily supports the Food is Medicine Institute at the Friedman School of Nutrition Science and Policy at Tufts University, serving as the Institute’s Director of Policy Strategy. In this role she helps plan and execute a strategic vision for informing and driving federal policy change across key priority areas.
Previously, Emily was employed by the American Heart Association and the National Academies of Sciences, Engineering, and Medicine in Washington, DC.
She earned a Master of Public Health degree from the University of North Carolina at Chapel Hill and a Bachelor of Science degree, summa cum laude, from Miami University in Oxford, Ohio. She has been credentialed as a Registered Dietitian Nutritionist since 2008 and is a member of the Academy of Nutrition and Dietetics and the American Society for Nutrition.
Danny Lennon has a master’s degree (MSc.) in Nutritional Sciences from University College Cork, and he is the founder of Sigma Nutrition.
Danny is currently a member of the Advisory Board of the Sports Nutrition Association, the global regulatory body responsible for the standardisation of best practice in the sports nutrition profession.
Introduction to this Episode
Public nutrition policy plays a critical role in shaping population health through laws, guidelines, and programs that influence what people eat. In this episode, Emily Callahan, an expert in nutrition policy, talks about why public nutrition policies often fall short and what “success” looks like.
They discuss how evidence-based nutrition interventions can stall due to political or practical barriers, and explore examples ranging from federal food assistance programs to sodium reduction initiatives. Crucially, they address how to evaluate if a policy has worked and highlight emerging strategies (like integrating “food as medicine” into healthcare) that offer hope for better outcomes.
This conversation is highly relevant for researchers, clinicians, and nutrition professionals, as it underscores the importance of policy in addressing nutrition challenges at the population level and examines how to design effective, data-driven policies for public health impact.
About The Guest
Emily Callahan helps national health and science organizations evaluate and communicate research to educate stakeholders and advance policies to promote population health.
Emily primarily supports the Food is Medicine Institute at the Friedman School of Nutrition Science and Policy at Tufts University, serving as the Instituteʼs Director of Policy Strategy.
Previously, Emily was employed by the American Heart Association and the National Academies of Sciences, Engineering, and Medicine in Washington, DC.
She has a Master of Public Health degree and is a Registered Dietitian Nutritionist.
Useful Terminology for this Episode
- Big “P” Policy: Formal, authoritative public policies (e.g. federal or state laws, regulations) set by governments or governing bodies. Big-P policies carry legal force and are enforceable (for example, a Congressional act like the Farm Bill or FDA rules on food labeling). These high-level policies often have broad scope and impact.
- Little “p” policy: Informal or organizational policies (e.g. institutional guidelines, workplace or community rules) that shape behavior without the force of law. These policies are more adaptable and can be implemented or changed quicker than big-P laws, but they apply only within a particular setting (for example, a schoolʼs nutrition standards or a companyʼs vending machine policy).
- Food Security: A household-level economic and social condition of reliable access to sufficient food for an active, healthy life. Food security generally emphasizes having enough calories or quantity of food. A population with high food security has minimal hunger and adequate energy intake.
- Nutrition Security: Access to not just enough food, but enough nutritious food to support a healthy, active life. Nutrition security means consistent availability and affordability of foods that are safe, high-quality, and promote health. It goes beyond calorie sufficiency (food security) to include the healthfulness of the diet.
- “Food as Medicine”: In this context, a concept of incorporating food-based interventions into healthcare settings as part of disease treatment and prevention. This includes programs like medically tailored meals (MTM) (meals designed by dietitians for patients with specific conditions), medically tailored groceries, and produce prescription programs.
- (Note: This usage differs from the colloquial misuse of “food is medicine” to reject medical therapy – here it refers to a specific set of interventions)