Just wanted to say that I hope your job interview went well. And yeah, you're right about the "fat prejudice." It's actually pretty well documented. But your attitude about it is perfect. You can't hide it the way others hide alcoholism or sex addiction or those things that will really get a company in trouble.
Let us know how the job interview went! (And the weekend in Vegas. Though with more challenging food situations, there are also usually more opportunities to burn calories.)