mind & bodyanalysisThe Conversation
The science and politics behind the panic over ultraprocessed foods
Ultraprocessed foods are defined by the NOVA classification, developed by Brazilian epidemiologist Carlos Monteiro, as industrial formulations with ingredients rarely found in a home kitchen, such as chemically modified substances and cosmetic additives like food dyes. Studies consistently link people who eat more of them to higher risk of chronic disease and early death. But the picture is mixed: sweetened drinks and processed meats are tied to heart disease and stroke, while breads, cold cereals, yogurt and savory snacks have correlated with lower rates. Only a few clinical trials exist, and they run for just weeks. Critics argue the category is subjective, since a home-baked cake and an identical store cake are classed differently. Many scientists say improving nutrient profiles matters more than eliminating processing.
The NOVA system sorts foods into four categories by degree of processing, with category 4 covering products built from extracted substances and additives. Researchers test links between these foods and health with observational studies, which can show correlation but not cause.
The debate shapes food labeling, school meals and public policy. Whether the harm comes from processing itself or from sugar, salt and fat remains open, and that difference determines what should be regulated.
Illustrative photo · Evan-Amos, CC0, via Wikimedia Commons
