dano

Being constantly busy is sure to make you lose weight, but it's not a good method. There's gotta be some rhyme to your rythym; set up a plan and stick to it. Bag lunches instead of driving through McD's, head to the gym a few times per week, drink diet soda if you're a sodaholic like myself. Not only does devising a plan work, but it gives you an awesome confidence boost when you notice the weight disappearing and this shows up in higher grades and a generally better morale.
I won't pretend to be a health nut because I'm not, by any means. I'm lazy when I want to be. I've put on 6 lbs since I left school in May, but I start back full-time in less than a month and I know I'll drop that 6 lbs almost instantly. I work out 2-3 times per week, eat healthier, and starting this semester I'm going to be running in the early AM. I'm carpooling with friends this semester so no more sleeping until the last possible second. Knowing that I'm responsible for others getting to school on time is a big deal. I have to be up early, I may as well get in some exercise if I'll be up then.
Just find a niche that works for you. "I'm constantly busy" is a terrible excuse to not be physically active. I said it for years, and then finally got myself set into a plan and I dropped nearly 25 lbs. in a single semester. I'm heading into my 4th year in college and I weigh less than I did when I graduated high school, and I'm taller now too!