increase of mercury in her blood after twenty days of eating tuna. The FDA's "action level" for mercury toxicity does not require the agency to actually take any action. ----- San Francisco physician Dr. Jane Hightower is acknowledged by many to be the first doctor in the United States to recognize low-level mercury poisoning in patients who regularly ate certain kinds of fish. Hear firsthand about competing interests, varying government standards, and what it took to get high ...