IN 2000, a doctor in San Francisco saw a stream of patients with odd and confusing symptoms, such as fatigue, stomach upset, loss of hair, trouble concentrating and memory problems. She soon discovered that they all had something in common: they all ate lots of big fish, like tuna and swordfish. So she tested them for mercury, and found their levels were elevated. She advised them to stop eating the fish and soon the mercury, and most of their symptoms, disappeared. Most doctors would have called it a day.
didn’t. She wanted to know why she could not get clear official guidance telling…
