well the exception would be to pig out on their spiritual banquets
I knew one sister (with unbelieving mate) who was severely overweight. She was counselled by the elders to lose the weight
Another sister (elder's wife) was to my knowledge ever counseled about her weight
I knew countless witnesses who used food as a comfort to the point of being grossly obese.
One guy I worked with would knock off a tub of ice cream every single night after stuffing himself on junk all day. He would get physically distressed if separated from food too long( like between morning tea and lunch). His hip joints collapsed at 40 and he now is an invalid pensioner. He was also made an elder at the same time.