suppose you were given this situation

How to find out if a now-skinny-person used to be an obese person but had gastric bypass surgery during the holidays:

"ewwweee...that turkey sure does look good. I'm so hungry I be I could eat the whole thing. Have you ever eaten a whole turkey?"

"I could've sworn there were two pies here."

"Isn't it funny when you eat so much at Thanksgiving that you feel like you're going to burst? Isn't that funny, huh?"