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Green tea and health

Health benefits of green tea

   Of late more research has been carried out related to the health benefits of green tea.
Tea is making a shift from just a beverage to a health drink.  

※ Pay attention, however, that the following explanation is not always applied to tea in PET bottle. 
 
Let's look into the nutrients in tea.

Catechins (Tannin)

   The source of bitterness in green tea is Tannin.  Catechins are also called tannin.  There are six known catechins in green tea.  Nibancha (second-picked tea) has more catechins than Ichibancha (first-picked tea).  If you'd like the healthiest effect, you'd choose Nibancha.
 
Catechins
Epicatechins
Gallocatechins
Epigallocatechins
Epicatechin gallate
Epigallocatechin gallate
 
   These catechins have been reported by researchers to possess the following positive by-products:
 
   1. Slows down diseases associated with aging such as cancer, diabetes, heart attacks, strokes and the hardening of the arteries.  They are also anti-oxidants.
   2. Loweres bloods cholesterol
   3. Prevents hardening of the arteries
   4. Possesses antibacterial effects (such as O-157, Staphylococcus aureus, Shigella)
   5. Enjoys anti-carcinogenic properties
   6. Helps to lower blood pressure and blood sugar levels
   7. Prevents in tooth decay
 
<About Polyphenol >
 
You know Polyphenol?  It  is said that Polyphenol controls Active Oxgen and is effective on cerebral infarction and hardening of the arteries.  It is included much in red wine. Because catechin is a kind of Polychenols, ofcource it is included in tea, also in vegetables and fruites.
However, it is said that effective time of Polyphenol is short. About 3-4 hours. It is very difficult to drink red wine once 3 or 4 hours. Fruits also cannot be eaten so much but TEA! You can drink TEA at any time when thirsty or want to be relaxed. Isn't it great news for person who concerned about health?

Caffeine

   Green tea's bitterness comes from caffeine.  New tea buds have harder tea leaves and the amount of caffeine becomes lower, the harder the tea leaves.
 
Caffeine has been reported by researchers to possess the following positive by-products:
 
   1. Wakes you up, gives you energy from fatigue
   2. Increases urination
   3. Increases heart functions
   4. Relieves headaches
   5. Promotes digestive functions by increasing gastric acid
 
   Sencha has the highest contents of caffeine.  Some contain more than 3000mg of caffeine per 100g of tea.  An adult's maximum daily intake of caffeine should be no more than 500mg per day.  Consuming in excess of 500mg per day could lead to dizziness, an irregular heart beat and insomnia.  In therms of green tea, if you drink more than 13 cups of green tea, you could exceed 500mg of caffeine.  We've now come to understand that L-theanine in green tea lowers the effects of caffeine.  So there should be no worries no matter how many cups of green tea you drink.  Don't you think so?

L-theanine

   The source of green tea's thick flavors is amino acids and there are twenty known amino acids not all of which are present in green tea.  Half of the amino acid content in green tea is in the form of L-theanine.  Tea's thick flavor is determined by the amount of L-theanine.  Recent studies show that L-theanine reduces PMS symptoms.  This is great news of women.

Vitamin C

   Green tea has a lot of vitamin C.  Ichibancha (first-picked tea) has 500mg per 100g of tea, Nibancha (second-picked tea) has 400mg per 100g of tea.  Vitamin C is known to weaken when heated but vitamin C in green tea has the unique characteristic of being resistant to heat.  Even with hot water, vtamin C in green tea remains viable and 80% goes into the first brewed cup.  In summer, drinking a lot of green tea is recommended to prevent summer fatigue.
 
Vitamin C has been reported by researchers to possess the following positive by-products:
 
     1. Prevents colds
     2. Prevents the growth of cancerous cells
     3. Is effective as an Anti-stress agent
     4. Lowers cholesterol levels in blood
     5. Prevents scurvy