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Published 15:09 21 Sept 2018 BST
Updated 17:45 20 Sept 2018 BST

Sounds mad, right - solid mass just turning to air? But that is what happens to most of it, while the rest leaves the body in urine, faeces, sweating, and tears. Lovely.
It does make sense, if you think about how slow burning fat can be, and we can now finally tick that off our list of stupid questions that keep us up at night.
Other ones we like to ponder - could the world ever run out of songs? Why aren't blueberries blue? And do dentists go to other dentists or do they just do it themselves?Explore more on these topics: