I take it you haven’t watched the 1995 film “Seven”, the killer does both as I recall. Check it out, I suspect you will like it.

Force-feeding has also been practiced by various prisons and ‘hospitals’ as a way of dealing with hunger strikes. It’s not precisely overfeeding, but it often takes the form of torture.

There are also accounts of forcing the eating of non-food and undesirable food. Again as a form of torture. I think it is featured in some of de Sade’s works.