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[–] TimberWolfAlpha 0 points 2 points (+2|-0) ago 

I had always assumed that the spent byproducts of metabolizing fat were excreted along with the rest of your waste.

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[–] IShouldNotTalk 0 points 5 points (+5|-0) ago  (edited ago)

Most of the carbon molecules that make up stored fat are exhaled. The lungs are efficiently evolved to remove waste carbon dioxide from the body

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[–] crab_crouton 0 points 3 points (+3|-0) ago 

Along the same lines, trees grow from the carbon dioxide in air. Thus, you can say that trees grow literally out of the air.

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[–] grenius 0 points 0 points (+0|-0) ago 

Yep. A shit ton of your mass is expelled as CO2 while losing weight.