Sure, but there's a difference between "impossible" and "not supported by current evidence". As another poster points out, there is an example with flouride (t

Sure, but there's a difference between "impossible" and "not supported by current evidence". As another poster points out, there is an example with flouride (though I am no anti-flouridist). Other examples might be widespread use of BPA and PFAS. Air-pollution might be another example of something that could effect much of a population (though it's not in the food chain). I'm not a conspiracy theorist, and until we have strong scientific evidence I won't claim that there are population-wide effects. But saying it's "impossible" is wrong.