I see this headline every six months.  This is how encroached industries act when their primary product is found to literally be poisonous.
Big tobacco denied the link to cancer for decades, despite them knowing the damage.  Before that, the lead industry kept leaded gasoline in our cars.  There were Congressional hearings in the 1920's on the matter, but we did nothing.  
Big asbestos did the same thing under the same circumstances starting in the early 20th century.  And if we wanna go back to the 19th century, big mercury, which absolutely was a thing, acted in the same way when we tried to keep mercury out of our food as an admittedly effective preservative. 
They follow the same playbook every time.  You'd think we'd be able to counter them by now.
edit
This American Experience documentary on the literal poisons that used to be in our foods, and the fight against the industries putting them there, comes highly recommended.  You may need a VPN to view if you're out of the US.