Up until now I've always taken everyones word for it whether certain
foods are or are not digestible. Assuming that a food isn't digestable
just because we haven't found any evidence of man eating it before the
agricultural era isn't really proof. So I started wondering, is there a
simple test that we can perform to determine whether a food is
digestible or not? Or do we have to get a lab to determine it for us?

Please, no corn jokes ;)

--Toby