This is important. In fact, it might be useful to note this definition explicitly. A calorie is unit of heat... not a unit of nutrition. See http://en.wikiped

This is important. In fact, it might be useful to note this definition explicitly. A calorie is unit of heat... not a unit of nutrition. See http://en.wikipedia.org/wiki/Calorie http://en.wikipedia.org/wiki/Calorie You can say there are calories in wood, particularly in the context of combustion (though it's more common to talk about that sort of thing in terms or BTUs or joules).