We’ve all heard that so-called “ultraprocessed” foods aren’t great for us—but why? It turns out scientists are still trying to figure that out. Dr. Sanjay Gupta sits down with his friend and colleague, CNN’s Meg Tirrell, to talk about her recent visit to the National Institutes of Health, where researchers are studying the effects of these foods in ways that could shape future food policy and change how we shop. 

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