The obesity epidemic.
Which, over the course of time, includes basically all well-nourished people. Yes, some are characteristically thin, some have trouble keeping their weight up due to disease or dysfunction, but in general, as human beings, we gain weight as we age.
Nor does the medical model give credence to the trend shown by study after study: that “morbidly obese” people can be just as healthy (or healthier) than slim people, and just as active (or more active), because body size is generally an indicator of nutritional status, not health or movement habits.
So please. Let’s call it what it is, because terminology matters.
There is no “obesity epidemic”. There is a war on fat people.