In current medical research obesity is often conceptualised as an unavoidable disease. It’s your genes, your metabolism, the chemicals in your environment, what your mother ate when she was pregnant, whether she fed you at her breast. It is everything but what you choose to put in your mouth.

As someone who did his masters in an obesity lab, I have to disagree.

The general opinion was that the rise of obesity is due to a mix between us eating too much out of our own choice (food tastes too good, there is so much to each) and the corporations manipulating us into eating more through messing with us pasychologically and by adding excessive sugars etc.

Genetic predisposition and others factors are exactly that, only additional factors that could lead to a person being more prone to become obese. They don't turn you into an obese person (unless you had mutations in your leptin/leptin receptors, which are very rare cases).

An interesting niche in obesity research was the existence of "healthy obese" patients. Recently shown in a group of Finnish twins. Where one had a normal weight and the other obese, but both had similar metabolic values etc.