Do you guys think there's such thing as negative calorie foods? Because I know that if you go to a bunch of different pro-ana sites, there's often a list of negative calorie foods, but then I've talked to a couple people who don't think that they exist. True, everything has calories, but the "negative calorie" foods take more calories to digest than they actually have, supposedly. I used to eat them a lot, but now I'm worried as to whether they actually DO help with weight loss or not. So yeah, any advice/opinions would be greatly appreciated. Thanks!