What's the deal with these "negative-calor. foods?

Question: I know that no food or drink (except for water) is calorie-free and that some fruits and vegetables are low in calories. But do you really expend more energy to digest these foods than there are calories in the foods themselves?

Answers:
Yes. It is generally the water-base fruits and veggies, like celery, cucumbers, and watermelon. Also, the colder they are when you eat them, the more calories your body expends while digesting.

Other Answers:
Apparently that is true with celery. It provides negligible caloric intake, and your body uses more energy than is provided to process it.

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Yes, celery is a prime example

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The only food I know of that is negative calories is celery. But yes, your body burns calories digesting it.

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Here is another question like yours
http://answers.yahoo.com/question/index;_ylt=Aq.gwAswdAXSZVoIDJW12l7sy6IX?qid=20060608194129AAqgKj6

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celery has negitave, calories, yep!

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