You'll understand my current interest in any seasonally relevent article about losing weight. This one, by Dr Karl about where fat goes when it goes away, is gross but fascinating:
When your body burns fat, it has to inhale lots of oxygen from the air (78 molecules of oxygen to burn one molecule of triglyceride).
Suppose you want to lose 10 kilograms of fat. That means you're going to have to add 29 kilograms of oxygen. That's a lot of breathing, and huffing and puffing. And to finish the process, you're going to get rid of 28 kilograms of carbon dioxide and 11 kilograms of water.
And how are you going to get rid of this 39 kilograms of carbon dioxide and water? Overwhelmingly, by breathing them out.
You might lose a tiny amount of this water as sweat or urine. But the vast majority of those atoms that originally made up triglyceride molecules exit your mouth and nose as carbon dioxide and water. However, you have to do a lot of breathing – each breath removes only 33 milligrams of carbon dioxide.
This means that your main excretory organ is your lungs.
My lungs are gonna be working overtime through January. I didn't pack on my normal five kilo christmas pudding, but the tummy eel is looking undeniably well fed.