"Some people have proposed "lectin-free" diets, mostly based on the writing of Steven Gundry. A typical lectin-free diet excludes a range of foods, including most grains, pulses, and legumes, as well as eggs, seafood, and many staple fruits and vegetables. However, Gundry's claims are considered pseudoscience*, and his book 'cites' studies that either have nothing to do with lectins or even show that avoiding wheat, barley and rye lead to less beneficial bacteria and more harmful bacteria, contrary to his recommendations. More seriously, Gundry has a conflict of interest, because he sells supplements that purportedly protect against effects of lectins. In one infomercial that lasted almost an hour, he pronounced that supplies are running low, and told viewers to act immediately and order as much as they could store. The necessity of supplements is similarly the crucial argument of his book, in which he writes "Getting all of the nutrients you need simply cannot be done without supplements." "
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Lectin - Wikipedia
* "Scientists and dieticians have classified Gundry's claims about lectins as pseudoscience."
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Steven Gundry - Wikipedia