1. You probably won’t get diarrhea.
Probably. Lettuce can get dirty, and reused straws washed in dirty dishwater isn’t exactly a gold-star promise of health, but by and large, eating veggie in Vietnam is pretty safe. It’s a cuisine the locals know how to do healthily and well, and they’ve been perfecting it for centuries. That burger, though? You may end up with a lot of time on your hands to contemplate why you just had to have a burger from a place named ‘OMG!’ while you shiver on your toilet, unmentionables coming out of both ends.