You wake up lighter than when you went to sleep. Here's the data

> The fat from our food gets stored in our bodies as a compound called triglyceride. What’s triglyceride, you ask?

Actually, most of what we call fat are just triglycerides, there are many kind of it, it's a family of molecules:https://en.wikipedia.org/wiki/Triglyceride . (And some of the food is stored in other forms, like glycogen: https://en.wikipedia.org/wiki/Glycogen )

> Indeed, more googling suggests we release somewhere around 20 mg of water and 36 mg of carbon dioxide per exhalation. [...] we breathe out about a pound of the stuff formerly known as dinner (and lunch, and breakfast, and snacks) while we sleep!

Actually, part of that mass comes from the oxygen in the air, that is used to burn the food, so that part has to be discounted. (I guess it's something like 75% of the mass from the food and 25% of the mass from the oxygen of the air, but I have to make the calculations carefully to be sure.)

Well, actually this happens at all times, but it's most dramatic when we're not eating. And hopefully that's what's going on while most of us are asleep.