Some encouragment pleast?

Eat healthy while at school. Walk to class. if it's too too far, try hoping off the bus a few stops early or take a bus that drops you off within fifteen minutes walk of your class. Use the stairs, but don't plod up them. You can do calf raisers by stepping on the edge and propelling yourself up. Maintain regular eating hours with your meals and snacks. The "FRESHMAN FIFTEEN" comes from having too many convenient food while staying up too late studying. Be strict with your time i.e. bedtimes are important, but allow yourself a cheat on the weekend so you don't look like "that kid". Also, check out your campus fitness center for class times for yoga, swimming, anything fun so exercise looks like a cheat, not a mandatory butt-kickin.
Enjoy school!!!!

^^ All of that.

Here are a few more suggestions:
Take the stairs, not the elevator. And then study on the 6th floor.
Pack a healthy lunch rather than eating cafeteria food.
Stay away from vending machines!
Drink water rather than soda. Water fountains are free.
Take advantage of the fitness center.
Don't obsess about your grades. Do your best, but don't make it a neurosis that compromises your balance in life.
Stay away from drinking and don't fall for the belief that it's some rite-of-passage.
Take short breaks during the day to walk around. Instead of sitting sedentary for 4 hours doing homework, spend 30 minutes studying at a time and then take a quick jog around the library before delving into the books for another 30 minutes.
Find a healthy way to de-stress DAILY. Whether it's prayer, meditation, art, deep-breathing, yoga, etc.. Find something to cleanse your mind every single day. College is going to push your boundaries academically, morally, socially, and in many other ways and the experience will change you. Giving yourself time to become centered and secure will lower your stress levels.