-Don't "drink" your calories. Stick with water, and if you want something flavored, try a diet soda or tea/coffee with artificial sweetener. No regular sodas, Snapple, and things like that which are just empty calories.
-At breakfast-go for eggs, oatmeal, fruit, yogurt, and healthy cereals (bran flakes, Cheerios, etc.) instead of any sugary cereals in the dining hall.
-Go for "clean" proteins-chicken breast, fish, lean beef, and meats that are not breaded and deep fried.
Use salad and fruits/veggies for the sides instead of fatty casserole dishes like scalloped potatoes and macaroni and cheese.
-Practice portion control. Monitor your portion sizes.
-If you eat in fast food places-order smartly. Thin crust pizza instead of pan crust, veggie toppings instead of pepperoni and sausage...and you can get a grilled chicken salad almost anywhere. Go for the baked potato instead of fries, a simple egg and toast instead of the huge 6 item breakfast in the local diner...you get the picture.