What are Calories Part 2

So last time, in the guise of addressing the emails of an Internet crazy person and his assertion (so far as I can tell) that since calories are not an actual physical thing, the calorie model of body weight is not valid. I addressed a ton of different issues related to the concepts of calories. This included what they are, how they are measured, some serious pedantry regarding vocabulary and what they ultimately represent. The overall summary of what I wrote there is that while it is true that calories are not a physical entity (i.e. I can’t hand you a bottle of calories), they are valid in that they represent a defined measurable quantity related to how something that is real (i.e. food or nutrients) is metabolized within the body.

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