The evidence against "ultra-processed" foods is weaker than you think [View all]

New analysis suggests other factors may explain the harms blamed on “ultra-processing.”

by Marina Bolotnikova
Jul 4, 2026, 11:15 AM UTC

In little more than a decade, the term “ultra-processed foods” (UPFs) has risen from an obscure academic coinage to one of the most potent ideas in the American food imagination. It has saturated media coverage of diet and disease, spawned a profusion of guides teaching shoppers how to spot UPFs at the supermarket, and animated Robert F. Kennedy Jr.’s crusade to remake American food policy.

It might also be kind of fake.

The trouble starts with the definition. UPF generally refers to packaged foods with questionable-sounding ingredients not typically used in household kitchens (high-fructose corn syrup, maltodextrin, and the like). But not even nutrition scientists can really tell you where normal processing ends and “ultra-processing” begins, and the difference often comes down to vibes. (I once covered a study that, inexplicably, classified tofu as ultra-processed.)

Further, much of the evidence linking ultra-processed foods to poor health outcomes such as heart disease and cancer is notoriously low-quality because it’s based on big, noisy observational studies that can’t disentangle correlation from causation. That weakness plagues a lot of nutrition research, but it’s especially notable for UPF studies, because many of them are drawn from diet surveys that don’t capture enough detail to tell whether the “white bread” or “yogurt” someone reported eating was ultra-processed in the first place.
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Original link:
https://www.vox.com/future-perfect/494045/ultra-processed-foods-science-rcts
Archive link:
https://archive.is/HBDGu