Asking because throughout my life (including when I was little) I’ve eaten cups full of raw pasta (the rice shaped little pasta) almost like it was a drink. I finished a 500g packet of wholewheat dry spaghetti just the other day. This is something I actually do so often I got told off by my dentist last year because it’s wearing my teeth down.
I remember reading this is actually a myth and comes from the idea that birds will explode if you feed them rice. The volume stays the same because the water ends up going into the rice.