Microwaves are a great investment. With those, I usually eat the um...Healthy Choice steamed meals. You can still have your fruits and veggies (just buy only 2-3 at a time for the fridge) and some low-carb cereal and milk is always delicious

Another thing you might want to check out with your hall director is to see if your dorm has a kitchen somewhere. I know it our dorms, right by the lobby area there's a small area for students to cook.