Let us not forget the current asserted risk of kale being an accumulator of thallium - hence panic (however: http://m.snopes.com/kale-not-safe/ )
Wait long enough and every substance we eat will be associated with a study which calls it into question. Then, if chance associates that study with a "slow news day", a relative panic will ensue. As a crusty old medicinal chemist, i offer the best rule of thumb (circa 16th century): [no matter what source it is] the dose makes the poison.
Not to nitpick but this phrasing always bothers me.
Our bodies, most likely, weren't "meant to" do anything by anyone. They've just pondered along adjusting to their environmental stimuli like everything else does.
