LOL-don't mean to laugh about your roomate but I know people who are the same way.
My best friend's father has type II diabetes and he does the same thing-buys light carb beer, eats chocolate with artificial sweetener, etc. My best friend is well on her way too because she doesn't consume any beverage that isn't some form of soda. I love her to death but you just can't help some people.
I read a whole list of signs that you may have acidosis, and just like all other diseases out there, yup I think I got it too! I'll have to find out for sure because I'm quite the hypochondriac :P.