Possibly the best suggestion would be to follow Michael Pollan's advice on food and you'll be just fine:  Eat food. Not too much.  Mostly plants.  (ie:  nothing from the middle aisles of the grocery store that has corn syrup in it.  Bread should not have corn syrup in it).  Don't count calories or how much you ate or plan on X, Y or Z.  If it tastes good and you're hungry and your great-grandmother would recognize the ingredients, eat it.

I just gave an interview to Health.com on this topic! I think that there was a lot of useful information. Check it out!
http://kissandtype.blogspot.com/2009/08/how-to-prevent-freshman-15.html

The only thing I have to disagree with is the skipping the cafeteria tip. All colleges now require their residents to buy meal plans (to prevent the saving money with ramen thing because its soo bad for you.) Personally, I go to a ,000 a year university and I'm not going to pay that much to also buy and cook my own food. Besides that, dorm rooms have size restrictions for mini fridges so you really can't keep a lot of fresh food in your dorm. Also, you would have to use the common room stoves which are disgusting, at every college I've ever seen. You just have to make smart choices in the cafeterias and workout.

I have to disagree with Kate's first tip regarding skipping the cafeteria. As she noted later in the episode, for most freshmen college will be the first time that they're on their own and responsible for their meals. And unfortunately, if left to their own devices, are likely to stock up their dorm rooms with Costco-size containers of cheese doodles, sugary cereals, and not much in the way of fresh fruit and veggies. This is especially true when you only have a mini-fridge and no sink or kitchen to prepare a real meal. While a cafeteria will certainly have some of those unhealthy (and often unappetizing) foods, most will also offer a salad bar, fresh fruit, yogurt, milk, juice, and a wide variety of other great options. Once you're an upperclassman and have your own kitchen, then skipping the caf makes more sense.

Great tips! Looking nice ladies!

Oh my God, girls, you are way off on the egg tip.  Egg yolks are high in cholesterol and saturated fat (the bad kind of fat, Meghan).  Not to mention, most eggs are chock full of the hormones that are pumped into the mother hen, which can be particularly dangerous to the already-fragile hormonal systems of college-aged women.

Kate's English muffin with peanut butter is a much more sensible option, although she'd be wise to add a little fruit to that breakfast for balance.  My perfect breakfast?  Half a peanut butter and banana sandwich on whole grain bread.  Delish.