R'amen.....hey, it's college.
Use their food card at the cafeteria to eat. Eat a small plate of 1,400 calories worth of food. Go to the gym after.
Done, healthy.
The same way anyone else can ... Buy healthy foods.
If you don't have room for a full-size refrigerator, buy a mini-fridge. Then add a latch to it, so you can lock it shut - so your room/dorm mates don't steal your food.