BBC | Fat can be breathed out as well as burned off as you lose weight, biochemists who have studied metabolism at a microscopic level say.
But they warn that people still need to huff and puff with exercise to keep slim - hyperventilating on its own will not do the trick.
The Australian team traced the route of fat out of the body as atoms.
Their findings are published in the Christmas edition of the British Medical Journal.
When fat is broken down to its constituent parts, a couple of things happen.
Chemical bonds are broken, a process which releases heat and fuel to power muscles.
But the atoms - the stuff fat is made of - remain, and much of these leave the body via the lungs as carbon dioxide, say the scientists.
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