It isn't clear. It says : 'Traci Mann says the emphasis should be on measuring health, not weight. "You should still eat right, you should still exercise, doin

It isn't clear. It says : 'Traci Mann says the emphasis should be on measuring health, not weight. "You should still eat right, you should still exercise, doing healthy stuff is still healthy," she said. "It just doesn't make you thin."' So even if you do eat well and exercise, you still won't lose weight because we have evolved to put weight on, not to lose it. What I take from this is that there is more of a biological component to this. If you take two people one who used to be obese and one who has never been obese, feed them exactly the same food, put them on exactly the same exercise - the ex-obese person will put more weight on than the always skinny person. The article gives no indication that there is evidence for this.