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Lexington, KY
A 20-year-old female asked:

Does water have calories? at all

2 doctor answers6 doctors weighed in
Dr. Michael Wall
Family Medicine 37 years experience
No: Water contains absolutely no calories at all.
Dr. Milton Alvis, jr
Preventive Medicine 41 years experience
No: Calories↑H20Temp: A calorie = the amount of heat energy required to warm 1 milliliter of water 1 degree Centigrade. The food label calorie is a kilocalorie; the amount of energy needed to warm 1000 ml (1 liter) of water 1 degree centigrade. Thus food with 500 calories can, burned completely, release enough energy to warm 500 liters of water 1 degree centigrade. Calories have no mass; don't show on body weight scale
Dr. Milton Alvis, jr
Preventive Medicine 41 years experience
Provided original answer
While energy & matter are interchangeable: the whole meaning of Einstein's great insight: E=mc2 (Energy=mass times the speed of light squared), from a human perspective they are always in only 1 form; not both, at the same time & the conversion coefficient is gigantic. I.e. Gigantic amounts of energy coalesce to tiny amounts of matter & tiny amounts of matter convert to Gigantic amounts of energy!
May 18, 2014

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Last updated May 19, 2014

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