Broad ‘Ultra-Processed Food’ Labels May Hinder Public Health, New Research Suggests
A new study cautions that sweeping public health initiatives targeting ultra-processed foods (UPFs) could backfire if definitions remain vague and the mechanisms of food processing aren’t better understood. The research highlights the risk of inadvertently penalizing nutritious foods while failing to address the root causes of diet-related diseases.
Researchers with Aarhus University in Denmark recently published a pre-print study demonstrating the potential for unintended consequences stemming from policies aimed at regulating UPFs. The current understanding of UPFs is largely based on the NOVA food classification system, which categorizes Category 4 UPFs as “industrially manufactured food products made up of several ingredients… including sugar, oils, fats, and salt and food substances of no or rare culinary use.”
The study’s findings, based on an analysis of six cohort studies encompassing over 635,000 participants, revealed a nuanced relationship between UPF consumption and type 2 diabetes risk. While ready-to-eat dishes, meat-based products, and sugar-sweetened beverages were associated with a higher risk of developing the disease, dairy products and sweets showed an inverse association – meaning higher consumption correlated with a lower risk. Other categories, such as breads and cereals, showed no clear relationship.
To further explore these inconsistencies, the researchers conducted a post-hoc analysis of the Danish Diet, Cancer, and Health cohort, involving more than 57,000 individuals. This analysis focused on a hypothetical diet high in what the researchers termed the “Terrible Five” – processed meat, sugar-sweetened beverages, red meat, refined grains, and vegetables. The results underscored how grouping disparate foods into a single category can distort findings. Associating processed meats and sugary drinks with vegetables, for example, produced misleading results, suggesting harm despite the well-established health benefits of vegetables.
“These findings highlight violations of the consistency assumption,” the researchers stated, “which requires exposures to be well-defined and free of multiple relevant versions.” They argue that broad classifications like UPF inherently violate this principle, making it difficult to interpret and generalize effect estimates across different populations.
Consequently, the researchers suggest that policies like taxation, labeling requirements, and dietary guidelines based on the current understanding of UPFs could inadvertently penalize nutrient-dense foods. They advocate for future research to prioritize refining UPF definitions, improving dietary assessment tools, and investigating the specific processing mechanisms through controlled trials.
“The point of this paper is not to dismiss the value of UPF research to date,” the study clarifies. “It has undeniably advanced our general understanding and sparked important discussions, but rather to emphasize that, if we want to move beyond associational UPF–disease cohort studies and towards a deeper causal understanding of ultra-processing itself, we must recognize the current limitations of the field.” The researchers propose a shift towards investigating how different processing techniques – rather than simply “ultra-processing” as a broad category – influence short-term health outcomes in tightly controlled randomized trials.
The implications of this research are already being felt in the United States, where efforts to define and regulate UPFs are gaining momentum at both the federal and state levels. In October 2023, California passed a first-of-its-kind law establishing a statutory definition of UPFs, directing the state’s Department of Public Health to identify and phase out UPFs of concern from schools by 2035. The California legislation defines UPFs as those “high in” saturated fat, added sugar, or sodium, and containing artificial dyes, flavors, sweeteners, emulsifiers, and thickening agents. Notably, raw agricultural products, minimally processed foods, and pasteurized milk are exempt from this definition.
At the federal level, the U.S. Food and Drug Administration (FDA) and the U.S. Department of Agriculture (USDA) recently concluded a public comment period – closing in October – on a joint request for information (RFI) regarding a uniform definition for UPFs. The RFI garnered diverse opinions from stakeholders on how, or even if, UPFs should be defined and regulated.
Without greater precision and mechanistic insight, sweeping UPF policies could undermine public health goals, potentially discouraging consumption of beneficial foods while failing to address the true drivers of disease risk, the researchers conclude.
