Ultimate Non Sequitur

So a bunch of us are sitting there around the lunch table at work, and one of the girls we work with walks by, the following conversation ensued:

Naing: Hey, Sonya...gonna join us for lunch?
Sonya: Naw, I already ate.
Gordon: Oh, what'd you have?
[Editor's Note: Everyone's worried about missing out on the "lunch run", thereby getting a crappier lunch than you could have had....yes, this is a bit weird, but otherwise this sounds like an even more odd question...]
Sonya: Just a Chinese bun.
Dave: Aaaaaaand?
Sonya: That's it...
Dave (while digging into his Swiss Chalet chicken dinner): Oh, man...you really don't eat much, huh?
[Editor's Note #2: Sonya is about 5'-6" and might weigh 90 lbs....tops....]
Sonya: I'll bet I could out-eat all you guys when it comes to chocolate or candy!
All (sensing a contest!): Ohhhhhhhhh...
Dave: I doubt it... I once ate a dozen donuts on a dare.
Sonya: Well, I only did half a dozen...but they were Krispy Kremes.
Dave: Did you know that would kill a diabetic?
Sonya: Oh, no...I didn't....
Iain: Apparently you're not a diabetic.
Sonya: Yeah, I guess not...