Most of the weight you lose is water, you lose ~100 grams of weight from carbon loss (0.22 lbs, from 0.012g of carbon per breath).<p>Veritasium has a nice video on this:
<a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=lL2e0rWvjKI" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=lL2e0rWvjKI</a>