Fingers on the Belly (1988)

A young woman wanders through Paris spending most of her time eating all the junk she can: in a fast-food, out of a tin can and so on. She steals some more food in a supermarket, meets a friend who gently carresses her belly in the street, then goes back home where she makes herself vomit in the toilets. She is then ready for the family dinner.

Unfortunately the movie Fingers on the Belly is not yet available on HBO Max.