jno - most obese people overeat. (Put on a bit myself over the last year, but it's going.) I did know, however a very rotund, 'Billy Bunter' of a chap whose condition was glandular (he was under the care of a hospital).
Personally, my 11-yr-old grandson appalled me when I saw him after a year, a couple of months ago. He'd gone from rounded/on the plump side - but it would go when he grew - to a definite Billy Bunter. Even the lips were puffy. He was bursting out of his clothes.
Quandary, what can I do? I served a lovely, salady lunch and didn't mention it. I have to leave it to his mum, who said 'airily' that 'lockdown hadn't been kind' to him.
I'm considering giving him a Billy Bunter omnibus for Christmas!