I have a question, and I can't seem to put all the pieces together.
Conservation of mass states that mass can not be created or destroyed. Applying this to food intake this means that if you eat 1 pound of butter you can not gain more than 1 pound of body weight.
The opposite is what if perplexing to me. In order to loss 1 pound of fat you have to expel this mass from you body some how. I under stand that calories are key to weight loss, but calorie is a unit of energy not mass. I know there is potential energy in fat, and the metabolic process breaks down the fats into different things that you body can use and the energy is used as well. But where does the mass go? no matter how small you body breaks down the fat. the sum of atomic masses remain the same(conservation of mass)
This question comes up because I weight myself before bed and then right when I get up. sometimes I'm 2 pounds less in the morning. I do think I sweat that much and I don't take any massive 2 pound turds during the night. So where did it go, how did it get expelled out of my body. Maybe I'm not accounting for fluid loss during the night.
They way I see it there is only 3 ways to expel mass. Crap, piss, or sweat. what else am I missing?
Heat does not count, that's energy, not mass. I would not think breathing, because gasses are not that heavy and I'm sure the mass in and out when I breath is equal.
So where does the mass go?