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I think that what we see are only video cuts from the actual show when it is shot. Like any TV show or movie they do a lot of editing. Who really knows whether she finishes the entire meal or gives it to the Camera Crew!!! However, I have always raised the same question myself. Most people just have to look at the quantity of food she eats/drinks and they will gain weight. On another note Sam has stated a few times that she works out in a gym and participates in mountain biking and in-line skating. Perhaps she is just very active and is able to eat a lot because she burns it off. Finally, I had a girlfriend once that could eat ANYTHING and everything and could'nt gain weight even if she tried. Maybe Sam is the same and just has a high metabolism. Just a few things to think about. More power to her!