Extreme levels of fluoride from daily consumption of a concentrated brew caused pain, brittle teeth
By Barbara Bronson Gray
WEDNESDAY, March 20 (HealthDay News) -- Here's a cautionary tale about the value of moderation.
A case study reported in the March 21 issue of the New England Journal of Medicine shows how habitually drinking an extreme form of highly concentrated tea over almost 20 years created a hard-to-diagnose case of severe bone damage in a 47-year-old woman.
Worried that she had cancer, the patient told her primary care doctor in Lansing, Mich., that she was concerned about bone pain she had been having in her lower back, arms, legs and hips for five years. She also had had all her teeth extracted due to brittleness.
Her X-rays showed her bones were unusually dense, but there was no sign of disease. The fluoride level in her blood was also high. She was referred to Dr. Sudhaker Rao, section head of bone and mineral metabolism and director of the bone and mineral research laboratory at Henry Ford Health System in Detroit, for a bone biopsy.
The patient's intake of brewed tea was astronomically high, said Rao, who learned that the patient had been regularly drinking a pitcher a day of tea made from about 100 to 150 tea bags, which gave her more than 20 milligrams (mg) of fluoride. She had a fluoride concentration in her blood of 0.43 milligrams per liter, while the normal concentration is less than 0.10 mg per liter, Rao reported.
Fluoride is used to prevent tooth decay and is usually prescribed for children and adults whose homes have water that does not naturally have fluoride in it, according to the U.S. National Library of Medicine.
It turns out that Rao, the author of the case study, came from an area in India where fluoride levels in the water were naturally extremely high, sometimes causing a condition called skeletal fluorosis. He has also recently consulted on a few cases involving high fluoride in the blood, he pointed out.
"Most of us can excrete fluoride extremely well, but if you drink too much, it can be a problem," he said. Brewed tea has one of the highest fluoride contents of all the beverages in the United States, according to Rao. He immediately wondered if the fluoride in the concentrated tea concoction the woman was regularly drinking could be the cause of her bone troubles, he said. "There have been about three to four cases reported in the U.S. associated with ingesting tea, especially large amounts of it," he noted.