New Belief-Mapping Study Reveals Disconnect Between Consumer Perceptions and Expert Consensus on Carbohydrate Foods

A study published in the Journal of the American Nutrition Association establishes a quantitative belief-mapping methodology to evaluate how consumers and nutrition experts perceive the healthfulness of carbohydrate-rich foods.¹ Conducted by researchers at NORC at the University of Chicago and supported by The Institute for the Advancement of Food and Nutrition Sciences (IAFNS), the study highlights substantial alignment gaps and expert uncertainty across 20 commonly consumed carbohydrate foods with the goal to identity foods for research and nutrition communication prioritization. This data offers insights for understanding current educational gaps and market communication priorities.

What Methodology and Analytical Framework Were Used in the Study?

The researchers developed a quantitative belief-mapping framework utilizing consumer survey data coupled with a meta-nutrition profiling system. This system incorporates transparent and harmonized expert healthfulness ratings to quantify consumer-expert misalignment, consumer misperception, and expert-only uncertainty. To identify priority foods for future research, education, and industry communication, the framework ranked foods by jointly analyzing three specific vectors: poor consumer-expert alignment, expert uncertainty, and national consumption prevalence within the United States.

What Specific Perception Gaps and Expert Uncertainties Were Discovered?

The data revealed significant discrepancies between consumer beliefs and expert consensus. Out of the 20 carbohydrate-dense foods evaluated, 85% received a consumer-to-expert Alignment Grade of either C or D. Furthermore, 75% of the evaluated foods were classified with an "Uncertain" status regarding expert-only healthfulness ratings, underscoring that consensus on specific carbohydrate matrices remains complex even within the scientific community.

Consumer misperceptions skewed heavily toward the negative. The magnitude of negative consumer misperception—defined as consumers rating a food as less healthy than experts do—was approximately 2.3 times larger than positive misperception.

Specific findings regarding individual food categories include:

• Negative Misperception: All surveyed potato-based foods (including French fries, chips, and baked potatoes) and unbuttered, air-popped popcorn were rated as less healthy by consumers than by experts.
• Positive Misperception: Honey emerged as the most positively misperceived food, with consumers rating it as healthier than expert benchmarks indicate.
• Mixed Misperception: A majority of the foods (70%) exhibited a mixture of both negative and positive misperceptions (utilizing a threshold of ≥15%/85%). Complex mixtures of directional misperceptions were specifically observed for honey oat cereal, fruit juices, whole wheat bread, and corn tortillas.

What Limitations Are Noted in the Research?

The study's authors acknowledged the limitation of the quantitative framework assessing a finite selection of 20 carbohydrate foods, meaning the findings may not fully capture the complexity of the entire modern dietary landscape.

Additionally, other limitations include the reliance on self-reported survey data, which is inherently subject to recall bias.

What Are the Strategic Priorities for the Nutrition Industry Moving Forward?

By applying a joint analysis of low alignment, high expert uncertainty, and high national consumption rates, the researchers identified specific priority foods that require targeted research and clearer consumer education.

“There are two priorities,” stated the study authors Josh Erndt-Marino and Alyssa Ghirardelli in a news release.² “First, improve consistency in how and why carbohydrate-containing foods are rated across food rating systems developed by experts, including how uncertainty and disagreement are communicated. Second, in consumer messaging, prioritize misperceptions about the healthfulness of commonly consumed foods such as white rice, white bread, corn tortillas, and fruit juice with vitamin C.”

These findings point to distinct challenges and opportunities in positioning carbohydrate-containing products. The high prevalence of negative misperceptions indicates that consumers may avoid certain foods due to an understated perception of their healthfulness. Conversely, areas with high expert uncertainty represent categories where further clinical validation, functional ingredient optimization, and transparent nutrition labeling could support clearer communication.

The interactive belief-mapping tool is publicly hosted on the FRESH platform and is extensible to additional foods, populations, and health attributes to assist in the design of nutrition communication, labeling, and policy interventions.

References

1. Erndt-Marino J, Ghirardelli A. Educational Gaps and Communication Priorities for the Healthfulness of Carbohydrate Foods. J Am Nutr Assoc. Published online June 15, 2026. doi:10.1080/27697061.2026.2687436
2. Institute for the Advancement of Food and Nutrition Sciences. Consumers View the Healthfulness of Carbohydrate Foods Differently than Experts. July 7, 2026. Accessed July 8, 2026. https://www.newswise.com/articles/consumers-view-the-healthfulness-of-carbohydrate-foods-differently-than-experts