Featured Research

from universities, journals, and other organizations

Potentially Harmful Fluoride Levels Found In Some Instant Teas

Date:
February 9, 2005
Source:
Washington University School Of Medicine
Summary:
Instant tea, one of the most popular drinks in the United States, may be a source of harmful levels of fluoride, researchers at Washington University School of Medicine in St. Louis report. The researchers found that some regular strength preparations contain as much as 6.5 parts per million (ppm) of fluoride, well over the 4 ppm maximum allowed in drinking water by the Environmental Protection Agency and 2.4 ppm permitted in bottled water and beverages by the Food and Drug Administration.

Instant tea, one of the most popular drinks in the United States, may be a source of harmful levels of fluoride, researchers at Washington University School of Medicine in St. Louis report. The researchers found that some regular strength preparations contain as much as 6.5 parts per million (ppm) of fluoride, well over the 4 ppm maximum allowed in drinking water by the Environmental Protection Agency and 2.4 ppm permitted in bottled water and beverages by the Food and Drug Administration.

Related Articles


The discovery stemmed from the diagnostic investigation of a middle-aged woman suffering from spine pain attributed to hyper-dense bones. Testing for the cause of her symptoms revealed the patient had high levels of fluoride in her urine. She then disclosed a high consumption of iced tea—claiming to drink one to two gallons of double-strength instant tea throughout the day—which led the researchers to test for fluoride content in several brands of instant tea available on grocery store shelves.

Each of the teas was tested as a regular-strength preparation in fluoride-free water, and each contained fluoride, with amounts ranging from 1.0 to 6.5 parts per million. The study is reported in the January issue of The American Journal of Medicine.

"The tea plant is known to accumulate fluoride from the soil and water. Our study points to the need for further investigation of the fluoride content of teas," says Michael Whyte, M.D., professor of medicine, pediatrics and genetics. "We don't know how much variation there is from brand to brand and year to year."

In many communities in the United States, fluoride is added to drinking water to help prevent tooth decay. However, the Public Health Service indicates that the fluoride concentration should not exceed 1.2 ppm.

Physicians have been aware that ingestion of high levels of fluoride cause bone-forming cells to lay down extra skeletal tissue, increasing bone density but also bone brittleness. The resulting disease, called skeletal fluorosis, can manifest in bone pain, calcification of ligaments, bone spurs, fused vertebrae and difficulty in moving joints.

"When fluoride gets into your bones, it stays there for years, and there is no established treatment for skeletal fluorosis," Whyte says. "No one knows if you can fully recover from it."

Americans are exposed to fluoride not only through fluoridated water but increasingly through fluoridated toothpastes and other dental preparations. Pesticides, Teflonฎ-coated cookware, chewing tobacco, some wines and certain sparkling mineral waters are more unusual sources of excess exposure. Until now, instant tea had not been recognized as a significant source of fluoride.

According to Whyte, the findings could aid in the diagnosis and treatment of patients who have achiness in their bones. In the future, doctors should ask such patients about their tea consumption.

Whyte MP, Essmyer KE, Gannon FH, Reinus WR. Skeletal fluorosis and instant tea. American Journal of Medicine 2005 Jan;118(1):78-82.

Funding from the Clark and Mildred Cox Inherited Metabolic Bone Disease Research Fund supported this research.

Washington University School of Medicine's full-time and volunteer faculty physicians also are the medical staff of Barnes-Jewish and St. Louis Children's hospitals. The School of Medicine is one of the leading medical research, teaching and patient care institutions in the nation, currently ranked second in the nation by U.S. News & World Report. Through its affiliations with Barnes-Jewish and St. Louis Children's hospitals, the School of Medicine is linked to BJC HealthCare.


Story Source:

The above story is based on materials provided by Washington University School Of Medicine. Note: Materials may be edited for content and length.


Cite This Page:

Washington University School Of Medicine. "Potentially Harmful Fluoride Levels Found In Some Instant Teas." ScienceDaily. ScienceDaily, 9 February 2005. <www.sciencedaily.com/releases/2005/02/050205124905.htm>.
Washington University School Of Medicine. (2005, February 9). Potentially Harmful Fluoride Levels Found In Some Instant Teas. ScienceDaily. Retrieved November 20, 2014 from www.sciencedaily.com/releases/2005/02/050205124905.htm
Washington University School Of Medicine. "Potentially Harmful Fluoride Levels Found In Some Instant Teas." ScienceDaily. www.sciencedaily.com/releases/2005/02/050205124905.htm (accessed November 20, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Thursday, November 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

UN Says It Will Scale Up Its Ebola Response

UN Says It Will Scale Up Its Ebola Response

AFP (Nov. 20, 2014) — UN Resident Coordinator David McLachlan-Karr and WHO representative in the country Daniel Kertesz updated the media on the UN Ebola response on Wednesday. Duration: 00:51 Video provided by AFP
Powered by NewsLook.com
Takata Offers "sincerest Condolences" To Victims of Malfunctioning Airbag

Takata Offers "sincerest Condolences" To Victims of Malfunctioning Airbag

Reuters - US Online Video (Nov. 20, 2014) — U.S. Congress hears from a victim and company officials as it holds a hearing on the safety of Takata airbags after reports of injuries. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Obesity Costs Almost As Much As War And Terrorism

Obesity Costs Almost As Much As War And Terrorism

Newsy (Nov. 20, 2014) — The newest estimate of the cost of obesity is pretty jarring — $2 trillion. But how did researchers get to that number? Video provided by Newsy
Powered by NewsLook.com
Calling All Men: Here's Your Chance to Experience Labor Pains

Calling All Men: Here's Your Chance to Experience Labor Pains

Reuters - Light News Video Online (Nov. 20, 2014) — Chinese hospital offers men a chance to experience the pain of child birth via electric shocks. Sharon Reich reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins