The environment and our food sources have radically changed in the past hundred years. My grandparents ate a mostly organic diet because that's all that was available back then. They didn't eat food made in a factory. They didn't drink water filled with plastic microparticules. Their work was manual labor. I could easily continue with other environmental factors that are different.

What seems absurd to me is to jump to conclusions instead of taking a scientific approach to eliminating factors until we find causation.