Some actors like to eat on camera, and it's often done well. But if you' re obliged to watch the motion of the actor's jaws and swallowing reflex in too much detail, eating on camera can be disgusting. It isn't so much that eating itself can be disgusting, but that the mixture of acting and really doing the thing, as in pornographic movies, can be disgusting. Mainly it's actresses who are shown asleep. They look good with their eyes closed.
Men look dumb or dead.
A lingering death scene used to be common in movies. Now they are rare, but eating and screwing abound, and thousands of characters are quickly killed on screen. Death is trivialized with much else that people care about. There are dreadful movies made entirely of effects. The audience, highly stimulated, assumes it has had an experience.