>How does focusing on a species that lives in national parks in an unindustrialized part of the world negate the notion that environmental impacts other than process food which are endemic to modern, industrial life have an influence on weight gain?
I never said it does.
>Your proposed "control" fails to differentiate between diet and non-diet influences by removing both from the equation. It's essentially irrelevant to the thesis at hand.
That's not the thesis it was meant to be a control FOR.