>>The whole area is such a mass of guesswork, wishful thinking and eyeball estimates... and yet they claim to have the expertise to prescribe one a diet.
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>https://en.wikipedia.org/wiki/Calorimeter
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>Took the food, measured it.
>After a while they learned, if you eat raw carrots, you will have no intake, but a value. So they measure, feed you a dose, try the excrements, measure those. Your intake is the difference.
>Was wrong too. So they do some maths (iow guesswork). You know, maths is cheaper to alter then measurement.

Seems like they tried the excrements and liked them.