This is certainly true. Others will quote that exercise is not an effective mechanism to maintain healthy weight with 40 studies to back it. The goalposts seem to move a lot in this domain. Nevertheless, there is a ton of evidence of people in various behavior patterns that do not have such obesity issues in their society. It's wild to me how many people reach a conclusion of helplessness given that fact. The real kicker is that we aren't talking about one population being 5-10 lbs too heavy. We are taking about a difference between healthy weight and pervasive obesity. It's wild that such a delta is normalized