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It's fairly easy to deduce if you've ever weighed yourself at night and again in the morning. You always lose a pound or so while sleeping.

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The weight lost during sleeping is probably the water lost through respiration and transpiration (sweat).

Yeah, but that's not really the answer most people are looking for. They're not looking for water loss, they mean the fat cells.

Water is a byproduct of burning fat.

Yes, but the only part of the fat that transfers to the water is the hydrogen, which weighs just slightly more than nothing (perhaps TFA covers this... I didn't read it...)

> ... the only part of the fat ...

It's only Hydrogen... But it still needs to go somewhere. Oxygen comes in to carry away the Hydrogen as water--you can't urinate Hydrogen.

You can urinate other things than water though, some others of which contain hydrogen.

Sure, my point is just that the carbon outweighs the hydrogen ~6:1.

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