2) Be a cafeteria clepto: it's ok to sneak some food out of the dining hall, especially if you have an unlimited meal plan. I take bread to make sandwiches in my room, and today I took some chickpeas to make some humus (which I will post about soon). I also take fruit quite often. I like to take bananas and freeze them for Banilla Soft-serve (which is apparently now a proper noun because I capitalized it). I'll probably post about that at some point, too. I will sometimes take meals to go if I'm headed somewhere where food won't be easily available, like my 5 hour long costume practicum class.
3) See what made to order foods are offered: These foods are not necessarily healthy, but can certainly add variety to your diet. My cafeteria offers omlettes with a ton of topping choices, and also an option for egg whites ate breakfast time. They also offer a bunch of grill items from 2-4pm including burgers, fries, and my favorite (the only one I've actually ordered), grilled cheese. Like I said, not healthy per say, but the food tends to taste better than they're typical stuff.