Congrats on starting college! I started for the first time at age 23, so I know where you're coming from. At my school (NDSU) it seems like everyone is fresh out of high school.
As for your mom, is there any potential she could use the pre-diabetic news as incentive to lose the weight? What if you were weight-loss buddies? My mom has also been obese as long as I can remember. She'll talk about how she needs to lose weight, and then in the next breath wants to order a pizza. Her weight has brought her diabetes, in addition to her numerous other health disorders (fibromyalgia, arthritis, breast cancer and a stroke) that may or may not be directly related to her weight. All this before she turned 60 years old. Her health problems were what made me start to lose weight, because I could see that if I didn't, I'd be in the same shoes she's in.
Started on March 13, 2009
First Mini-Goal: Reach 264 pounds
Next Mini-Goal: Reach 238 pounds