My partner has celiac, and has mentioned something like this, but rather than chemicals, it purportedly had to do with heirloom seed strains. europe apparently

My partner has celiac, and has mentioned something like this, but rather than chemicals, it purportedly had to do with heirloom seed strains. europe apparently has more variation among the same crop, and they're also closer to the things our body evolutionary expects since that entire region is much older w/r/t western diet. the USA has basically been hyperoptimizing a monoculture in relative isolation to such a degree that it's kindof its own thing, and some people's bodies don't tolerate it well. now, is this actually supported by a mountain of evidence? I don't know. But at a glance, it at least sounds plausible.