After yesterday's post about hibiscus tea being higher in anti-oxidants than green tea, you may be left thinking you should make a switch from green to hibiscus tea....but before you throw out that green stuff, let's look at some of the other benefits, above and beyond anti-oxidant activity, that green tea has to offer.
Although coming in second place to hibiscus tea, green tea does still have a very high antioxidant value (
see yesterday's table) and is also a detoxifier by activating enzymes in the liver that eliminate toxins from the body.
It is rich in polyphenols including catechins and particularly EGCG (epigallocatechin gallate-3). EGCG is one of the most powerful nutritional molecules against the formation of new blood vessels by cancerous cells (
angiogenesis) needed for tumour growth and metastases. Green tea also facilitates the death of cancer cells (
apoptosis) and has been seen to enhance the
effects of radiotherapy on cancer cells.
Pretty impressive stuff heh? And so many good clinical studies on it's effects.
Japanese green tea - called
Matcha - has even higher levels of EGCG than chinese green tea, as matcha is ground up tea leaves rather than just steeping the leaves in water.
EGCG is not present in black tea as it is destroyed during the fermentation process required to make it. However, decaffeinated green tea still contains all the good polyphenols that caffeinated green tea does, so its preferable to go with decaf.
After two or three cups of green tea a day, EGCG is plentiful in the blood and spreads throughout the body by means of our small capillary vessels. These surround and feed every cell in the body. EGCG settles on the surface of cells and blocks the "switches" or receptors on the cells, whose function it is to set off a signal that allows the penetration of neighboring tissue by foreign cells, such as cancer cells. Once the receptors are blocked by EGCG, they no longer respond to the signal that cancer cells send to invade tissue and to make the new vessels needed for tumor growth.
Studies have shown green tea to substantially slow the growth of
leukemia, and
breast,
prostate,
kidney,
skin and
oral cancer.
It has been found that green tea has even greater effect when combined with other molecules commonly found in Asian diets, such as soy.
So hibiscus tea or green tea? I don't see any reason to choose just one - why not just drink both? Both have benefits and both taste very different from each other, so if you are in the mood for something fruity, try the hibiscus, otherwise, go green.
And don't limit yourself to just drinking your EGCG - you can add it to yoghurts, smoothies, ice cream, cakes, desserts - especially if you use the powdered Matcha. Even Nestle have come out with a green tea KitKat bar in Japan!
How will you get your green tea?
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