Just a thought, I was at university while losing weight and on a food plan too (and I lost about 70lbs). Here is what I did. I asked for smaller portions all the time if someone was passing out food. If there's just a common area to grab the grub, how about filling at half the plate with salad and/or veggies, a quarter with a protien and a quarter with a starch (depending how big the plates are mind you) or even skip the starch and leave a quarter of the plate bare. In the end you won't be wasting your meal plan, you'll be using it wisely. Maybe have dessert once a week or something not to feel deprived, figure out what works for you.
Take advantage of your gym or campus trails or what not too...