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.
If this is a superpower I’ll have my whole life then I’ll take lead so that I don’t get any more brain damage. All ingested lead gets passed harmlessly instead of going to my brain
If it’s a one-time thing, then I’ll go with methyl mercury in front of a room of scientists.