Does anyone else have rumination not as a disorder, but more as a behaviour, as in something that can be controlled?
After eating I'm often able to regurgitate some of whatever it was using inner muscles, keeping it in my mouth to chew and then swallow again (i.e. intentional rumination). This sometimes happens several times after a meal or snack until the regurgitated food becomes unpalatable.
I have this habit because of a belief that food needs to be chewed/savoured for as long as possible to make the calories worth it. I tell people the regurgitation is out of my control because the truth is embarrassing and, honestly, a bit disgusting. It's surely fucking up my teeth, but... ¯\_(ツ)_/¯