Instant tea contains harmful fluoride?

- Last updated on GMT

Related tags: Tea, Us

The increasingly popular instant tea beverage may be a source of
harmful levels of fluoride, claim US scientists on findings from a
very small study.

Researchers at Washington University School of Medicine in St. Louis found that some regular strength preparations contain as much as 6.5 parts per million (ppm) of fluoride. In the US the maximum level is set a 4 ppm maximum level for drinking water, 2.4 ppm is permitted in bottled water and beverages.

"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, professor of medicine, pediatrics and genetics. "We don't know how much variation there is from brand to brand and year to year."

Sales of ice tea are growing rapidly across the world, with the drink gradually moving from Japan and the US, where it is already well established, towards the potentially high-consumption markets of Europe.

Global sales of ready-to-drink ice tea are estimated at $23 billion (€19bn).

A recent report from Datamonitor estimated that French annual iced tea consumption rose to 3.2 litres per person in 2002 - a 65 percent rise on 1997, while the figure in Germany was up by 33 per cent to 6.5 litres.

The US scientists say their 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 supermarket 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.

According to Whyte, the findings could aid in the diagnosis and treatment of patients who have achiness in their bones.

Questions surrounding the impact of dietary fluoride on human health still exist.

Some dentists and the World Health Organisation have backed fluoridisation while other experts have said more research is needed on the issue.

Fluoride has been said to help decrease tooth decay and strengthen teeth in young children.

However, others believe the substance can have toxic side-effects and prove harmful to dental health.

Related topics: R&D, Food safety and labeling

Related news

Related products

show more

Process safe, precise filling of different liquids

Process safe, precise filling of different liquids

ViscoTec America Inc. – Dosing & Filling Systems | 22-Aug-2018 | Application Note

The process-safe and precise filling of liquids in tubular bags is essential. Complete machines and systems which are using filling systems based on the...

Filling technology for glass and plastic bottles

Filling technology for glass and plastic bottles

John Bean Technologies (JBT) | 19-Jun-2018 | Technical / White Paper

Manufacturers of food and beverages packed in glass and plastic bottles face a range of mounting pressures. Hygiene and food safety requirements are increasing...

993_Of note_web image_610x343

Regulatory horizon scanning: what you need to know

Leatherhead Food Research | 12-Jun-2018 | Technical / White Paper

Understanding forthcoming and proposed food and beverage legislation is critical for informed decision making. But what about the future developments that...

Harmonizing food & drinks internationally

Harmonizing food & drinks internationally

Leatherhead Food Research | 17-Apr-2018 | Technical / White Paper

To the untrained eye, food and beverage legislation spanning international markets may look similar, but the reality is that it is fraught with complexity...

Related suppliers

Follow us

Featured Events

View more


View more