Home   »    Diabetes   »   Cholesterol  »   Cancer   »   Blood Pressure  »   About Dieting   »    Contact Us
Polyphenol-enriched tea may double cholesterol excretion

Polyphenol-enriched tea may double cholesterol excretion

By staff reporter

Get the latest Market Reports on
tea
polyphenol
EGCG
Related News

DSM to make weight management personal with IntegraGen
DSM explores anti-diabetic activity of green tea extract
Black tea may speed up recovery from stress
Do antioxidants make tea healthier than water?
DSM talks up weight loss with green tea extract at Vitafoods

News Archives

All news for November 2007
All news for October 2007

13/11/2006 - Drinking a cup of polyphenol-enriched oolong tea with a high fat meal may increase the amount of cholesterol excreted by the body by half, says a small study from Japan and Taiwan.

The results, which suggest a heart-healthy benefit for the tea, add to an ever-growing body of science linking consumption to a wide range of health benefits, including lower risk of certain cancers, weight loss, and protection against Alzheimer's.
The health benefits, which have mainly focused on green tea, have been linked to the polyphenol content of the tea. Green tea contains between 30 and 40 per cent of water-extractable polyphenols, while black tea (green tea that has been oxidized by fermentation) contains between 3 and 10 per cent. Oolong tea is semi-fermented tea and is somewhere between green and black tea.

The four primary polyphenols found in fresh tealeaves are epigallocatechin gallate (EGCG), epigallocatechin, epicatechin gallate, and epicatechin.

The new research, published in the current issue of the European Journal of Clinical Nutrition (Vol. 60, pp. 1330-1336), was led by Keiichi Abe from Institute for Health Care Science, Suntory Ltd, and included researchers from the University of Tokushima and Providence University, Taiwan.

The scientists recruited twelve healthy aduls (nine women, averag age 22) and randomly divided them into two groups, one to receive 38 g of fat from potato chips (19 g within 30 minutes of eating lunch and dinner) and 750 ml of a placebo- or polyphenol-enriched oolong tea at three meals in a double-blind placebo-controlled crossover design.

A seven-day washout period separated the ten-day intervention periods, and blood samples were collected after days 8, 18, 25 and 35. Three faecal samples were also collected in order to measure lipid excretion levels.

The Japanese-Taiwanese researchers report that faecal lipid excretion was significantly increased during the polyphenol-enriched oolong tea period, compared to placebo (19.3 versue 9.34 g/3day, respectively).

The polyphenol-enriched oolong tea period was also associated with a 50 per cent increase in cholesterol excretion, compared to the placebo-teat group (10.8 versus 1.2 g/3day, respectively).

High cholesterol levels, hypercholesterolaemia, have a long association with many diseases, particularly cardiovascular disease (CVD), the cause of almost 50 per cent of deaths in Europe, and reported to cost the EU economy an estimated €169bn ($202bn) per year.

"The results of this study indicated that polyphenol-enriched oolong tea could increase lipid excretion into feces when subjects took high-lipid diet," concluded the researchers.

More research with a larger study population is needed, in addition to mechanistic studies to elucidate the underlying mechanism by which the polyphenols appear to reduce fat absorption. But the results are in agreement with other studies that have linked red wine consumption, polyphenol-rich green tea or pine bark extracts to improved cardiovascular risk factors.

This study is good news for both the tea market and the tea extract market. European demand for tea extracts is currently surging, having reached 500 metric tonnes by 2003.

This has seen companies such as DSM, with its Teavigo boasting 95 per cent purity of EGCG, and Taiyo International, with its Sunphenon claiming more than 90 per cent purity, position themselves firmly in specific catechin markets.

The global tea market is worth about €790 (£540, $941) million. Green tea accounts for about 20 per cent of total global production, while black tea (green tea that has been oxidized by fermentation) accounts for about 78 per cent.


Using Tea to Reduce Your Cholesterol

High cholesterol is a health concern for many Americans. High levels of LDL cholesterol are a leading contributor to heart disease. LDL cholesterol is what contributes to clogged arteries. Arteries become clogged and narrowed when LDL cholesterol circulating in the blood becomes oxidizes and hardens into plaque. The more LDL cholesterol you have circulating in your blood, the more plaque you’ll develop.

A second type of cholesterol, known as HDL cholesterol is what we refer to as “good cholesterol”. This form of cholesterol carries away LDL cholesterol to the liver, where it can pass out of the body. This is why we should have high levels of HDL cholesterol. However, when our levels of LDL cholesterol are high, our HDL levels are typically low.

If you’re trying to lower your LDL cholesterol levels and raise your HDL cholesterol levels there are several things you can do.

The first is watching your diet. Avoiding foods high in saturated fat and cholesterol like butter, eggs and red meat can help you lower those LDL cholesterol levels. In addition, you can help raise your HDL levels by replacing those saturated fats in your diet with healthy fats like olive oil, canola oil, avocados and nuts. These fats raise our HDL levels and keep us healthy.

Secondly, to reduce LDL cholesterol levels, it’s important to exercise. Walking is a great way to help reduce your cholesterol levels, and it will help lower your blood pressure, as well.

If you’re overweight, losing weight will help you reduce cholesterol levels, as well. Making the dietary changes mentioned above and beginning to exercise should make dropping a few pounds easier. If you’re a smoker, you should stop. Smoking significantly increases your risk for heart disease.

Your cholesterol level is also affected by your heredity. Some people are prone to high cholesterol even if they exercise regularly and eat a healthy diet. If you fall into this category, you may require medication in addition to lifestyle changes in order to get your cholesterol under control.

Another way to help reduce LDL cholesterol levels is to drink tea. Green tea has been shown in many studies to help prevent LDL cholesterol from oxidizing and turning into plaque. These studies have suggested that even if your LDL cholesterol level is high, drinking tea may prevent it from causing a problem.

However, it appears that drinking tea may actually have the power to lower your blood cholesterol levels, too. A study conducted by the University of Hong Kong studied various types of Chinese tea and their effect on cholesterol in rats. The rats were all fed a high cholesterol diet for a week before beginning the study. Then, the rats were divided into several groups. Each group was fed a different type of tea while continuing the high cholesterol diet for another eight weeks. A control group of rats received water instead of the tea.

The types of tea used for evaluation including Jasmine, Iron Buddha, Pu-erh, oolong and green tea. The reason that multiple types of tea were used was to evaluate whether fermented teas are as effective at reducing cholesterol as those that are not fermented. Green tea is completely unfermented, Jasmine tea is mildly fermented, and oolong and Iron Buddha are semi-fermented. Pu-erh is a fully fermented tea.

In addition to measuring the cholesterol levels in the mice participating in the study, the weight and fattiness of the liver was also measured.

This study concluded that the teas that had been minimally fermented (Jasmine and green tea) had a significant effect on both the serum and liver levels of cholesterol. In addition, these teas reduced the weight and fat of the liver. These teas were able to significantly lower the cholesterol levels, while the fermented teas and the water did not.* The levels of triglycerides and HDL cholesterol were not significantly different among the groups.

So, it appears that green tea may be a powerful way to help reduce your cholesterol level, particularly when combined with a healthy diet and exercise. If you combine the results of this study with those of past studies, you can come to the conclusion that consuming tea, particularly green tea may be able to help reduce the actual level of LDL cholesterol circulating in your blood and may also be able to prevent the cholesterol that is there from oxidizing and turning into plaque.

If you’re struggling to get your cholesterol level under control, green tea is definitely worth a try. It has no side effects, and is well tolerated by nearly everyone – even those who are sensitive to caffeine. And, in addition to helping you lower your cholesterol, green tea may have other added benefits.

Green tea may be able to help you lose weight and may prevent heart disease, diabetes and cancer. Green tea just might be the one supplement to your diet that can help with many of the health problems plaguing Americans today.

Jon M. Stout is the Chairman of the Golden Moon Tea Company. Golden Moon Tea carefully selects the finest rare and orthodox teas, which are processed slowly and handcrafted with extreme care. At their website, you can learn more about their current tea offerings, including their exceptional green tea, white tea, black tea, oolong tea (also known as wu-long and wu long tea) and chai. Visit goldenmoontea.com for all details concerning the Golden Moon Tea Company's fine line of teas.

The Information on this site has not been evaluated by the FDA.
The products sold here are not to diagnose or treat medical symptoms or disease.

Wu-Yi-Tea.com and content is copyrighted (C) 2007 by Natura Brands, LLC. All Rights Reserved