For many, no drink is more synonymous with good health than green tea, the ancient Chinese beverage known for its soothing aroma and abundance of antioxidants. By some estimates, Americans drink nearly 10 billion servings of green tea each year.
But a new report by an independent laboratory shows that green tea can vary widely from one cup to the next. Some bottled varieties appear to be little more than sugar water, containing little of the antioxidants that have given the beverage its good name. And some green tea leaves, particularly those from China, are contaminated with lead, though the metal does not appear to leach out during the brewing process.
The report was published this week by ConsumerLab.com, an independent site that tests health products of all kinds. The company, which had previously tested a variety of green tea supplements typically found in health food stores, took a close look at brewed and bottled green tea products, a segment that has grown rapidly since the 1990s.
It found that green tea brewed from loose tea leaves was perhaps the best and most potent source of antioxidants like epigallocatechin gallate, or EGCG, though plain and simple tea bags made by Lipton and Bigelow were the most cost-efficient source. Green tea’s popularity has been fueled in part by a barrage of research linking EGCG to benefits like weight loss to cancer prevention, but the evidence comes largely from test tube studies, research on animals and large population studies, none of it very rigorous, and researchers could not rule out the contribution of other healthy behaviors that tend to cluster together.
Green tea is one of the most popular varieties of tea in the United States, second only to black tea, which is made from the leaves of the same plant. EGCG belongs to a group of antioxidant compounds called catechins that are also found in fruits, vegetables, wine and cocoa.
The new research was carried out in several phases. In one, researchers tested four brands of green tea beverages sold in stores. One variety, Diet Snapple Green Tea, contained almost no EGCG. Another bottled brand, Honest Tea’s Green Tea With Honey, claimed to carry 190 milligrams of catechins, but the report found that it contained only about 60 percent of that figure. The drink also contained 70 milligrams of caffeine, about two-thirds the amount in a regular cup of coffee, as well as 18 grams of sugar, about half the amount found in a can of Sprite. (...)
But the most surprising phase of the study was an analysis of the lead content in the green tea leaves. The leaves in the Lipton and Bigelow tea bags contained 1.25 to 2.5 micrograms of lead per serving. The leaves from Teavana, however, did not contain measurable amounts.
But a new report by an independent laboratory shows that green tea can vary widely from one cup to the next. Some bottled varieties appear to be little more than sugar water, containing little of the antioxidants that have given the beverage its good name. And some green tea leaves, particularly those from China, are contaminated with lead, though the metal does not appear to leach out during the brewing process.The report was published this week by ConsumerLab.com, an independent site that tests health products of all kinds. The company, which had previously tested a variety of green tea supplements typically found in health food stores, took a close look at brewed and bottled green tea products, a segment that has grown rapidly since the 1990s.
It found that green tea brewed from loose tea leaves was perhaps the best and most potent source of antioxidants like epigallocatechin gallate, or EGCG, though plain and simple tea bags made by Lipton and Bigelow were the most cost-efficient source. Green tea’s popularity has been fueled in part by a barrage of research linking EGCG to benefits like weight loss to cancer prevention, but the evidence comes largely from test tube studies, research on animals and large population studies, none of it very rigorous, and researchers could not rule out the contribution of other healthy behaviors that tend to cluster together.
Green tea is one of the most popular varieties of tea in the United States, second only to black tea, which is made from the leaves of the same plant. EGCG belongs to a group of antioxidant compounds called catechins that are also found in fruits, vegetables, wine and cocoa.
The new research was carried out in several phases. In one, researchers tested four brands of green tea beverages sold in stores. One variety, Diet Snapple Green Tea, contained almost no EGCG. Another bottled brand, Honest Tea’s Green Tea With Honey, claimed to carry 190 milligrams of catechins, but the report found that it contained only about 60 percent of that figure. The drink also contained 70 milligrams of caffeine, about two-thirds the amount in a regular cup of coffee, as well as 18 grams of sugar, about half the amount found in a can of Sprite. (...)
But the most surprising phase of the study was an analysis of the lead content in the green tea leaves. The leaves in the Lipton and Bigelow tea bags contained 1.25 to 2.5 micrograms of lead per serving. The leaves from Teavana, however, did not contain measurable amounts.
by Anahad O'Connor, NY Times | Read more:
Photo: Everett Kennedy Brown/European Pressphoto Agency
