And I confess I’m biased. I’m pretty plump myself. I’m amazed that I do as well as I do for the amount of fat I’m hauling around.
The health problems associated with being plump are a first world problem, something which did not come to the fore until modern medicine had vanquished most other ills, especially contagious diseases.
In the ancient world, where risks to health were different, being plump was equated to being healthy. This is even a biblical assumption. One could survive various infectious and parasitical diseases better if one had ample bodily fat. Also overall life was less sedentary in the first place, so the temptation to the plump to just sit and veg out found fewer victims.
Burning off the fat may be a good thing in a modern health care context, but just keeping the fat moving is very helpful in itself.