Lay off the pills. Make sure to eat a good breakfast, get some protein, meat and cheese in it. Doesn't have to be big, but enough to stave off the sugar rush and following crash that you'd get from only a glass of juice, or cereal.
45 minutes of cardio 3 times a week at least!
I weigh less now than I did as a soph in college, due to this. Throw the Ipod on and go. Make nice with the trainers, get 'em on your side and they'll help you out.