Inedible as in anything that isn’t food (ranging from something that would be dangerous, like glass, poisonous plants, or uranium, to something that is safe to eat but unpleasant with no nutritional value, like cardboard.) Eating the thing will be safe and painless.
Definitely uranium. Those calories are light
I wish I could safely store uranium in my belly as an energy source. Imagine how little I’d have to eat.
Pro tip: eat enough of those and the amount you have to eat will drastically decrease.