I work at a mental health hospital not on the ED unit though, but a lot of patients have feeding tubes. To try and encourage them to eat, they have set times e.g. breakfast (08:15 - 09:00), snack one (09:45 - 10:00), lunch (12:00- 12:45), snack two (14:45 - 15:00), dinner (17:00- 17:45), snack three/supper (19:15 - 19:30). Also, (someone correct me if I'm wrong), but in regards to forcing the patient to eat, a lot of the time it depends whether or not they're formal/informal.