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Part 4 of this nine-part series explains food processing’s role in today’s food system. Processing is presented as a continuum used for centuries to improve safety, edibility, access, shelf life, affordability, and nutrition security; most U.S. foods are processed in some way. Methods such as freezing, canning, and fermentation can preserve or enhance nutrient availability. While observational studies associate ultra-processed foods with poorer outcomes, causation is unproven; guidance should emphasize dietary patterns and nutrient density.
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