Proof that fat people do not have a slow metabolism using doubly labeled water doctors can tell exactly how much food someone has consumed. This fat ass in the documentary i watched tried saying that her skinny friend eats much more than she does and she hardly eats anything and that she's fat due to her slow metabolism. The end result was that she ate 50% more than her skinny friend and that she actually had a higher metabolism too. http://www.veoh.com/m/watch.php?v=v18495342w4fJhem8 The part Im talking about starts at around 7:22 but the whole documentary is worth watching