If matter can only change form through physical and chemical changes, where does all the matter we get rid of when losing weight end up in?

Question

If matter can only change form through physical and chemical changes, where does all the matter we get rid of when losing weight end up in?

In: 65

Answer 1

Fat is made of carbon, hydrogen and oxygen, in the same compound.

When we use that as fuel (because we have already spent everything we ate), we break down that compound into some energy, plus CO2 and H2O.

We mostly exhale that CO2. Water, some of it is exhaled, some may go down the drain.