> Fifty years ago, two-thirds of the USA were not obese. Biology has not changed in that time. What has? I wish more people would ask this question. It's extre

> Fifty years ago, two-thirds of the USA were not obese. Biology has not changed in that time. What has? I wish more people would ask this question. It's extremely innocent and straightforward, and replies to it are incredibly revealing of the respondents' understanding of biology . . .