Is Green Tea Really That Good For You?

Green tea, like black and oolong tea, comes from the camellia sinensis plant. Most of the world's production is from China and Japan.

The difference in the types of tea stems from the tea's fermentation processes. Green tea is made from the unfermented leaves. Because of this it contains the highest concentration of antioxidants called polyphenols, in particular a group called catechins, which are reputed to have a host of health benefits. This is also what gives it its slightly bitter taste.

Because it comes from the same plant, green tea actually contains the same amount of caffeine as other types of tea. The caffeine content of a cup of tea varies from 30mg to 100mg depending on how long the tea is infused and whether it is brewed with loose leaves or tea bags (loose leaves have more caffeine).

Though the leaves are usually brewed and drunk, green tea extracts can be taken in capsules and are sometimes used in skincare products.

PROS

Studies have found that the high levels of antioxidants in green tea may help prevent atherosclerosis (thickening of the artery wall) and coronary heart disease. However, the US Food and Drug Administration has ruled that there is no credible evidence to support claims of reduction in the risk of heart disease.

Research has shown that moderate consumption may help to lower cholesterol levels and raise levels of "good" HDL cholesterol, and some evidence suggests regular consumption may protect against various types of cancer, including lung, oesophageal and skin cancer, but this is still inconclusive.

Studies have also shown that it may help regulate glucose in the body and help to prevent the development of type 1 diabetes. It may also help to protect the liver against toxic substances. Some evidence suggests it improves mental alertness, most likely due to its caffeine content.

There have also been studies that suggest green tea helps to burn fat and boost the metabolism, but the evidence is not conclusive.

CONS

Green tea contains caffeine and excessive consumption may cause insomnia, anxiety, irritability or an upset stomach in some people.

It contains small amounts of vitamin K, which can make blood-thinning drugs such as warfarin less effective.

People taking blood-thinning drugs should watch their consumption and monitor any effects.

Those on diuretics and benzodiazepines should be careful as green tea can interact with these types of drugs.

James Brownless is a widely syndicated health writer who has recently researched cellulite creams , including Revitol Cellulite Solution.