The article [1] (which is not paywalled) does not challenge that. It specifically excluded the very small percent of people with genetic disorders, like leptin

The article [1] (which is not paywalled) does not challenge that. It specifically excluded the very small percent of people with genetic disorders, like leptin deficiency, which can genuinely directly drive obesity. If you look at e.g. compulsive gamblers, you're going to find substantial genetic differences in these individuals relative to those who do not find themselves addicted to gambling. This obviously doesn't mean that genetics are making them bet their house on black. But if there's any genetic component to factors like self discipline, impulsiveness, and other factors then these would show up when you look at differences between people where those sort of characteristics can work as a driving (or mediating) factor. [1] - https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1007603 https://journals.plos.org/plosgenetics/article?id=10.1371/jo...