I love the way the skinny people know so much about what drives the obese.
Surely, obesity isn't an evolutionary advantage. It makes you less fertile, less able to escape, less fit for survival and reproduction. I can't think of any wild mammals, no matter how as lib their feeding regime who get fat unless there is a specific reason for it. Hibernation, starvation they're 'planning for', insulation against cold water, desert water storage.
I think there's more to it than calories in calories out, because otherwise half the western world is weak willed and lazy, and I just don't believe that's true. I'm not weak willed and lazy, I'm fat. I'm sick of loathing myself because my chemistry doesn't work fast enough.
I don't know if low carb high fat is the answer, but I do know that we don't know everything, yet, and some of the current thinking is at best unhelpful.