There is a tiny misconception floating around in exercise-land. The mistaken belief is during exercise we burn fat. Most of us have been taught that fat is converted into energy or heat, (which by the way, is a violation of the law of conservation of mass) or that fat is somehow excreted or even converted to muscle.
In December of 2014, brand new proof that we exhale excess fat when we exercise hit the news media. Ruben Meerman, a physicist and Australian TV science presenter explored this question after he recently lost some weight and wondered where it went. He contacted Professor Andrew Brown, head of the University of New South Wales School of Biotechnology and Biomolecular Sciences, and together they traced the path of every atom in the disappearing fat. They presented their findings in a paper, published in the British Medical Journal.
Check out this awesome youtube video for an explanation of the process.
The next time someone asks you “where does the fat go when we lose weight?” You can tell them “most of the fat is breathed out as carbon dioxide.” It goes into thin air.
There you have it…another reason to get your heart rate up during occasional walks – to exhale out the bad stuff, literally!