I am an economic historian with a special interest in the history of diet and health. What you write is utter BS. Just compare modern life expectancy with that of the past, without antibiotics, vaccines, but bad food without too many animal proteins. We are massively taller than in the past, and this can easily be explained by the combination of a better diet (and animal proteins from dairy products in particular) and a more favourable infectious disease regime from sanitation and antibiotics plus vaccines. And no my research is not sponsored.