The livestock industry's to blame
Obviously all those chemicals are bad for humans.
Absolutely true, but it's not just livestock, its canned and processed foods, groundwater pollution, flame retardants, glues, pesticides, you name it,-endocrine disruptors have become a ubiquitous and virtually inescapable presence of the modern world. Thanks a bunch to Dow, Monsanto, DuPont and all the other lovely profit obsessed companies who lobby the FDA to tell us their Toxic Waste is "safe".
There would of been early puberty in the Middle Ages if they ate as much than your average American kids. No corporate conspiracy here. Only parenting failure.
The average American kids eat more because they are influenced by the corporations who sell food. And the parents are influenced too. It all boils down to the corporations' greed.