How the Dietary Guidelines Are Made and Why That Process Matters
How the Dietary Guidelines Are Made and Why That Process Matters
DGA Series: Part 5 of 8
The Dietary Guidelines for Americans influence everything from school meals to nutrition advice we hear online. In this series, we will look at their history, evolution, and impact to better understand how nutrition science translates into policy and practice.
This post focuses on transparency. How are the Guidelines actually developed? Who is involved? What evidence is considered? And where does science end and policy begin?
Understanding the process is essential if we want to evaluate the final product fairly.
The Five-Year Cycle and Why It Exists
By law, the Dietary Guidelines for Americans must be updated every five years. This timeline is written into federal statute and does not change based on who is in the White House.
For context:
The 2010 Guidelines were released during the administration of Barack Obama
The 2015 to 2020 Guidelines were also released under Barack Obama
The 2020 to 2025 Guidelines were released in December 2020 during the first administration of Donald Trump
The 2025 to 2030 Guidelines were released in early January 2026 during the second administration of Donald Trump, but would have been released no matter who was in the White House
Regardless of political leadership, the review cycle begins years before publication. Political leadership is usually irrelevant to health recommendations and guidelines.
For the 2025 to 2030 edition, planning began well before 2025. Federal agencies initiated scoping and evidence planning roughly two to three years prior to release. The Advisory Committee was convened well in advance to begin reviewing evidence and drafting its scientific report, and its inaugural meeting in February 2023 – nearly 3 years before the release of the Guidelines in January 2026.
This is not a short-term project. It is a multi-year process.
Who Sits on the Advisory Committee
The Dietary Guidelines Advisory Committee is composed of nationally recognized experts in nutrition and health-related fields. Members are selected for their professional expertise, not for representing industry groups.
Committee members typically include:
Registered dietitians and nutrition scientists
Physicians with expertise in cardiology, endocrinology, pediatrics, or preventive medicine
Epidemiologists
Public health researchers
Experts in maternal and child health
Behavioral scientists
Members are nominated through a public process. Federal agencies review nominations and select individuals based on expertise, research background, and experience. This selection occurs well before the Guidelines are finalized, often two or more years in advance. Again, with the 2025 Guidelines, the Committee was announced in January 2023, with its role of examining the relationship between diet and health across all life stages. They apply a health equity lens throughout their evidence review to ensure their recommendations to HHS and USDA account for factors such as socioeconomic status, race, ethnicity, and culture to the greatest extent possible.
Before serving, members must disclose financial and professional conflicts of interest. These disclosures are publicly available.
How the Evidence Is Reviewed
The Advisory Committee does not rely on single studies. It evaluates a body of evidence using systematic review methods.
The types of evidence considered include:
Randomized controlled trials
Prospective cohort studies
Population-level surveillance data
Meta analyses
Existing systematic reviews
The committee uses a structured process to define research questions, set inclusion and exclusion criteria, and evaluate the strength of evidence.
Exclusion criteria may include studies that are too short in duration, lack adequate sample size, have methodological flaws, or do not meet predefined quality standards. This can create debate. Some argue that certain types of evidence, such as emerging research areas, are underrepresented if they do not meet strict criteria.
The review process itself spans many months. Evidence review, drafting conclusions, grading the strength of evidence, and assembling the scientific report often take more than a year.
The final Advisory Committee Scientific Report is released publicly before federal agencies draft the official Guidelines.
This is important to note, since this shows transparency and that anyone can provide feedback and comments.
Public Comment Periods
There are multiple opportunities for public input throughout the process.
Public comment periods occur when:
The scope of questions is being defined
The Advisory Committee Scientific Report is released
The draft Dietary Guidelines are published
Who can comment? Anyone. Individual health professionals, advocacy groups, trade associations, academic institutions, nonprofit organizations, and private citizens can all submit comments. So, thousands of individuals in various health professions, such as physicians and dietitians, can comment; their respective professional organizations, such as the American Medical Association, the American Academy of Pediatrics, and the Academy of Nutrition and Dietetics, can comment as well. People can comment in various ways, both individually and as part of a larger organization.
These comment periods exist to promote transparency and democratic participation. They allow stakeholders to raise concerns, highlight emerging research, or challenge interpretations. The bigger issue is whether people choose to comment. Organizations will almost always comment and contribute. They have people watching for these comment periods. Individuals may not be noting these comment periods, or, if they do, may not go through the process.
How much influence do public comments have? That is more difficult to quantify. Agencies are required to review comments, but not to adopt the recommendations.
Still, public comment is a formal part of the record and can shape discussion.
From Scientific Report to Federal Policy
Once the Advisory Committee releases its scientific report, its role is complete. The committee does not write the final Dietary Guidelines.
The final policy document is written jointly by the U.S. Department of Agriculture and the Department of Health and Human Services. The Secretary of HHS and the Secretary of Agriculture oversee the final release.
Congress does not typically write the Guidelines themselves, but it plays a role in oversight and funding. Legislative pressure can influence the scope of review, funding for evidence analysis, and implementation priorities.
Again, this is an important point that people may not be aware of.
The Advisory Committee provides scientific recommendations.
The federal agencies then translate those recommendations into policy language.
Traditionally, the final Guidelines align closely with the committee’s conclusions.
However, deviations can occur.
The most recent release under Robert F. Kennedy Jr. included language suggesting that the science on saturated fat is not well established. This framing diverged from the Advisory Committee’s interpretation of the broader body of evidence, which continues to support limiting saturated fat in favor of unsaturated fat to reduce cardiovascular risk. This evidence is pretty clear and strong. This is just one area where it deviated.
When final policy language differs from the scientific report, it raises important questions.
Is the change based on a new interpretation? Political priorities? Public messaging strategy? Competing stakeholder influence? Even personal opinion?
These are not abstract concerns. The Dietary Guidelines shape school meal standards, SNAP education materials, military rations, hospital menus, and public health campaigns.
Why This Process Matters
The Dietary Guidelines represent a bridge between nutrition science and federal policy. That bridge is convoluted – not a straight line.
The Advisory Committee is tasked with evaluating scientific evidence. Federal agencies translate that evidence into policy. Public comments provide input. Political leadership ultimately oversees the final publication.
Each step introduces potential strengths and vulnerabilities.
Transparency around conflicts of interest matters because trust in public health guidance depends on credibility. Provide clear documentation of evidence reviews, as nutrition science is often contested in public discourse. Distinguishing between scientific recommendations and final policy language matters because they are not identical documents.
As this series continues, we will examine what happens when scientific recommendations meet political realities.
Next: When Science Meets Politics. What Happened to the Advisory Committee’s Recommendations?
Understanding the process is the foundation for evaluating the outcome.
Related blogs in this series:
Previous Editions of the Dietary Guidelines for Americans
The 2025–2030 Dietary Guidelines: What They Got Right DGA Series: Part 3 of 8
Where the 2025–2030 Dietary Guidelines Fall Short DGA Series: Part 4 of 8
How the Dietary Guidelines Shape Federal Nutrition Programs DGA Series: Part 7 of 8
Can We Really Feed People Well for $3 a Meal? A Reality Check DGA Series: Part 8 of 8
External Resources:
Why Do We Have Dietary Guidelines? A Look Back at the History
History of Dietary Guidance Development in the United States – A Timeline
