If you continue to eat barely anything, you will lose weight, otherwise nobody would ever starve to death

But you dont want that sort of weight loss. That's sick weight loss, you burn off all your lean body tissue and end up skin, bones and not much muscle. Then when you regain your weight, you stack on the fat and your body composition is worse than it ever was. This unfortunately happens to people who have things like cancer and lose lots of weight. It's really really bad for you.

I would guess that the reason weight loss plateaus out is that your metabolism drops as you lose your lean tissue and your body detects the lack of food, so it holds out as long as it can. But eventually, you'd continue to lose.

__________________
Jacqui