If it has no : Carbohydrates/sugars, protein or fat, then it has no calories. Examples are water, tea (w/o sugar), black coffee. This means it is not a source of energy for the body, but in the case of water, is still absolutely essential for life.
Answered 10/24/2017
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Because the FDA: allows the label to show zero calories if there are less than five
Answered 5/19/2014
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