That's a really good question. "During recent decades more than 100,000 new chemicals have been used in common consumer products"* Also there's the idea that

That's a really good question. "During recent decades more than 100,000 new chemicals have been used in common consumer products"* Also there's the idea that hybrid wheat has caused gluten intolerance * https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4214967/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4214967/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3573730/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3573730/