Do you think the Shinigami in Death Note were once human?

I think that maybe the shinigami were once humans who used the death note. Maybe when Ryuk said that notebook users couldn't go to heaven or hell, that's what he meant.
Allot of the shinigami (except maybe Nu and the shinigami king) have kind of a humanoid appearance. They all talk and act human too. Allot of them like human food, like apples, chocolate, and blueberries.
When Rem talks about how eating is unnescesary, she says it like shinigmai have EVOLVED so that they don't need food. Some animals still have organs (like the appendix in humans) that used to be neccesary but now just take up space in the body.
All the shinigami seem to express milaise and boredom, but if they had never lived anywhere else, that might not happen.

I'm just saying maybe, Ryuk, Rem, Gelus, and all those other shinigami were human once. Maybe Armo Justin was even some kind of king.