You can't go wrong with soup and big salads. You could also make a casserole type dish and freeze that. Do you eat meat? Dairy? Are you living in a dorm and working off of a hotplate, or do you have an oven you can use? Are you able to stock your fridge with fruits and veggies? I bulk cook on Sundays for the week's lunches, so I can give you some input, but I don't even know where to start since you've just asked for "healthy".
Last weekend I made curried lentils with cauliflower for the week's lunches, and had that with a salad. This Sunday DH has requested cheese-less zucchini lasagna, which will last us a week easily. A couple of weeks ago I made masala black eyed peas and had the leftovers on top of a salad. You can bake brown rice for a week, it freezes well, and stir-fry only takes a few minutes if the rice is ready. Homemade stir-fry sauce also freezes well. If you like beans, I know of a fabulous bean and rice cold dish that also makes a great topping for a southwestern salad. DH also rolls that up in whole wheat tortillas for lunches. You can cook oats once a week for breakfasts, or if you eat dairy you can portion out some greek yogurt with berries for an entire week. VegTimes had a great southwestern tamale pie in the Jan magazine that freezes well, DH and I enjoyed it.