If you've just arrived at college, you've probably been warned about the possibility of gaining the dreaded "freshman 15." It's a common problem for students who find themselves with little time (or space) to exercise, but a meal plan that allows unlimited portions at every dining hall on campus. Fortunately, there are ways to make healthier choices every day - and avoid putting on those extra pounds - even if you're too bogged down with classes to prepare your own food. POPSUGAR asked dietitians for their simplest, most effective advice for staying on track, and you'll be happy to know that you don't have to give up pizza after all. Keep reading for their tips!