i was hospitalized recently for two weeks (actually, i had to go back again about a month later for two weeks again..). it probably wouldn't make a difference, but i was in the psych ward. this hospital actually had quite a few options...they had about 4 vegan/veggie meals, they were all ethnic pakaged meals but they were actually pretty good. they had thai noodles with tofu, carribean bean stew, curry chickpeas, tescun bean with fetticuni....(i don't remember the names exactly)...it wasn't like crummy hospital food, it was just like those individual frozen meals actually.
although when my dad was in the hospital (a different one) they only had this vegetarian chili...and that was all he got for every meal. so you don't really know what to expect.... i know here it makes sense that they would serve more ethnic foods, since this city is so multicultural.... so it really depends on what the hospital is like and where it is.