Are We Destined to Fail at Weight Loss?

A thread about a OpEd of sorts discouraging weight loss gathered some steam.

My editorial: I continue to believe that most weight loss fails not because we are destined to get fat again or because the metabolism of formerly fat people is slower, but because people return to old patterns/habits and overeat. Our obesogenic food environment in the US does not help, but the main thing that happens is people go back to over consuming calories.