I’m the same way and I can’t tell you why. I’ve always had a weird aversion to cleaning my plate. Once juice or milk or whatever is below a certain level in the fridge it is also dead to me. No idea why I’ve been like this my whole life lol

Edit: Thinking back I used to get bullied about my appetite a lot when I was a kid maybe that’s why. And yelled at for eating/drinking the last of anything now that I think about it… Holy shit I think I cracked it wtf lmao