Rachel's Kitchen is a super tiny cafe on like.. 215 / Town Center, has some cheap (price) healthy sandwiches, salads, etc.
Whole Foods might qualify just because I think its one of the healthiest places to eat in Vegas.
Fukuburger (fookoo) is a burger truck that is parked around the SW part of Vegas like 6 days a week. If you go to their
website you can find out where. Open til super late and during the summer nights, pretty decent spot to stop by.