http://www.woodcentral.com/articles/...les_497a.shtml

I suggest everyone read the entire article - it's not quite as definitive
as Ed seems to think. it's mostly based on the absence of reported
illness or death from ingesting finishes. As the old saying goes,
"Absence of evidence is not evidence of absence."

The article states:

"No manufacturer providing finishes to the woodworking community puts
their finishes through these tests. Thus, no manufacturer can
legitimately claim they meet FDA regulations."

Well, maybe not a finish manufacturer, but I suspect the purveyors of
food grade linseed/flax oil have :-).

And Tried&True states:

"All Tried & True wood finishes comply with the product safety standards
established by the FDA: "safe for food contact surfaces" (FDA 21, Sec
175.300)."

BTW, I don't particularly like T&T finishes - they're difficult to apply
properly on large surfaces - too thick. But they work great applied with
a rag to a spinning item on a lathe.