Very cool idea, I think using health for ammo and then having to eat the fruits to regain it works in interesting ways, it keeps you switching weapons never allowing you to stick with just one thing and forces you to make decisions on when it's a good time to spend health.
Only issue I have is that it's a bit too easy, so the only way I was losing health was if I decided to shoot. I think you got a solid idea you can run with though.