Andrew Huberman· PhD
The idea is this there's a distribution of body weights among people so in any given so Society at any point in time some people are going to be leaner some people are going to be more obese that distribution where you lie on that distribution is determined primar by genetics so you may be the person who has the Thrifty genes so that basically cause you to save energy and so you would be more on the obese side or you may be may be a person who has different genes that cause you to be a little bit less hungry so you would be on the leaner side what environment does is then it shifts that whole distribution so that basically the mean shifts so that everyone becomes or most people become heavier