An ex-FDA employee has revealed what he claims is the most harmful breakfast cereal on the US market. Dr. Darin Detwiler, who previously served as a food safety expert for the agency, [said] that Kellogg's Froot Loops is the worst of the bunch, pointing out that the rainbow rings are "heavily processed and contain high levels of added sugars, artificial dyes and preservatives, which are linked to health concerns." Given the laundry list of bad-for-you ingredients in the bagged cereal, Detwiler says excess sugar is the least odious. A 1-cup serving of Froot Loops contains 12.35 grams of sugar, nearly half of the recommended daily allowance for children. However ... that serving size is unrealistic as most kids eat more than the recommended single cup. The bright red hue found in Froot Loops comes courtesy of Red 40, a controversial additive linked to a slew of health problems. A 2022 study yielded "alarming" results about the effects of Red 40 " sometimes called Allura red " on the human digestive tract. Researchers from McMaster University ... claimed the synthetic dye could potentially trigger irritable bowel syndrome and Crohn's disease after observing the biomarkers of damage in the gut cells of mice. The good doctor's revelation comes as more than 1,000 cereal lovers and health activists marched on Kellogg's Michigan headquarters on Tuesday, demanding the end of "harmful additives" being injected into US batches of products like Froot Loops and Apple Jacks.