Negative caloric value for food

I've been told that some food types have a negative caloric value, which means it takes more energy from the body to digest the food than the energy it earns. Does anyone know which type are they?

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Best Answer

Those would be vegetables like celery or kohlrabi. Most vegetables are hard to digest therefore when being digested burn a lot of calories, sometimes even more then the body gains for it at the first place.

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