Do you know once upon a time (Around 1967-75) a number of children died in India due to a curious disease called the Indian Childhood Cirrhosis. By late 70's researchers started realizing that this was a disease due to chronic copper intoxication, resulting from boiling of milk in brass utensils.
The doctors did not do anything. The WHO did not do anything. The Government did not do anything. However, due to stainless steel revolution when the brass utensils were gradually and silently replaced by stainless steel utensils, the Indian Childhood Cirrhosis quietly disappeared from the scene.