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Yes there are negative calorie foods. That doesn't mean that they have no calories. It means that it uses more calories to eat and digest them than they contain. For example if lettuce has 25 calories and chewing, eating, and digesting lettuce uses 30 calories, then you would have a net gain of -5 calories.
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I was surprise by this, too. I just stated on this site and put in my breakfast, dog walking, rapid walking (one hours worth all together) and the hour and a half I spent cleaning and my caloric goal shot up from 1880 to 2475, wow. This site says that I've basically taken in negative 550 calories.