I know this because I'm lucky enough to be trying a gluten-free diet for my fibromyalgia. So, some food allergies, you won't have a problem with, like nuts. You're probably OK, nut people. But if you're a vegetarian, or gluten-intolerant, or have a corn allergy, or maybe even a veggie allergy, you are going to have problems. The food people will tell you they will help you. But probably they won't, unless you are brave and go talk to the mean-looking cafeteria lady about getting more food. Which I haven't done so far.
As a gluten intolerant personage, this is my standard college diet. Breakfast: eggs. Lunch: hot dog (sometimes a hamburger patty) w/out a bun, and fries. Snack: salad and a bit of fro yo. Dinner: hot dog (or hamburger) and fries.
So if you have an allergy like mine, good luck guys. Eat whatever food you can when you visit home. Like CARBS!!!!!!!!!!!! I'm dying for pizza. Or even just BREAD. Yeesh.