You Are What You Heat
Most calories you consume keep your body warm
(HealthDayNews) -- Eighty percent of all the calories you consume are used to keep your body warm; i.e., to maintain the 98.6° normal temperature, according to David Bodanis, author of The Body Book, a Fantastic Voyage to the World Within. Each day, your body uses food to produce approximately the same amount of heat as a pound of coal burned into ashes.
To get enough calories to keep warm and move around during your lifetime, you will eat about 60,000 pounds of food. That's equivalent to the combined weight of six elephants.