What I’ve told is that many crops like corn now are genetically altered to tolerate glyphosate, so it can be sprayed over the whole field, leaving residue on the crops. The person who told me is convinced it’s the cause of many current health problems. Me, I try to keep an open mind.
Works out well for Monsanto/Bayer.
I try to keep an open mind too. It's OK for scientists to develop theories as long as they don't try to punish us if we disagree, like would-be-authoriratian "climate alarmists."
I'd bet that consumption of chlorine from treated city water (including breathing in the humid air while showering) causes more health problems than the glyphosate residues which may be in the foods we eat.
And the targeted weeds develop resistance. In combination the lathering on of Roundup increases with Roundup-resistant crops, which is the opposite of what they were sold to us for.