Used historically in China for many different ailments
Used as a currency
500 A.D. Demand rises, and farmers begin to cultivate tea
Tea Moves West
1606 First shipment of tea to Europe, by the Dutch East India Company
1657 Tea reaches general population of Europe
By 1850s England was consuming over 80 million pounds of tea annually
Kenya, Cameroon, South Africa, India, Sri Lanka
Growing Camellia sinensis
Shrublike and Grown in a Semi Tropical Environment on Plantations in Southeast Asia
Heavy rainfall, 3000-7000 ft. elevation
Cloning or Grown from Seed
Cuttings obtained from mother bush
Rooted and grown in nursery for 1 or 2 years
Grown in Rows or on Terraces
4 feet apart and 4-5 feet tall
Help irrigation and prevent soil erosion
How Green Tea is Made
Leaves are usually picked by hand
Leaves are steamed, rolled, and dried immediately and completely
Not fermented like black teas
Packed in foil-lined chests
Prevent absorption of unpleasant odors
Prevent loss of aroma
Serve warm, but not hot, to keep medicinal value intact
The active compounds in green tea are from a group of polyphenols called catechins
Four catechins present in green tea:
Mode of Action
With HIV the e pigallocatechingallate acts as a block to the HIV transport protein on the host cell
In cases of Dementia the epigallocatechingallate stops the formation of plaque and tangles by inducing the PKC pathway which increases the levels of α -secretase an enzyme the inhibits A β proteins a precursor to neurofibular tangles associated with Alzheimer's
Mode of Action
Epigallocatechingallate has been shown to inhibit angiogenesis of tumor cell and thus not allowing them to become cancerous. This is achieved by stopping the production of angiogenic compounds in the tumor cells.
It has also been suggested that green tea may induce apoptosis in cancer cells by shutting down the NF-KB pathway.
Mode of Action
Epigallocatechingallate prevents the breakdown of norepinephrine thus causing a raise in metabolism. It may also Inhibit adipocyte hypertrophy and hyperplasia, and possibly inhibit gastrointestinal enzymes involved in nutrient uptake, the mechanisms have yet to be deciphered for these processes.
Green Tea use in Cancer Prevention
Green Tea stops angiogenesis
Stops blood flow to tumor
Mice given green tea
EGCG slowed angiogenesis
Green Tea induced apoptosis
Increases normal cell growth while promoting programmed cell death
Mice given green tea over a 4 month period
Green Tea is antioxidant
Mice (in vivo) had A β peptides formation slowed
EGCG activated the protein kinase C pathway , which stops Alzheimer’s
Healthy Human Males
3 Groups: EGCG+caffeine, caffeine only, and placebo
EGCG group burned more fat than any other group
3 Month Period of people drinking Green Tea
Catechins causes more weight loss by causing the subjects to increase energy
Current Studies: Body Fat and LDL reduction
Two groups of men with similar BMI and waist circumference underwent 12 wk study. One group ingested a bottle of tea containing 690mg catechins, the second group received only 22 mg catechins.
Average weight loss in group 1 was 2.4 kg. In the second group it was only 1.3 kg.
LDL levels of group 1 decreased by about 11.5%; in group 2, only by about 5.2%.
Current Studies: Alcohol and Hepatic Toxicity
3 groups of rats were administered ethanol. Two of the groups were also treated with theanine, one prior to ethanol, one after.
Both theanine treated groups showed decreased blood alcohol concentration.
LPO levels in the livers of the ethanol alone rats nearly doubled after 3 hours. The LPO levels of the theanine treated rats remained basically normal throughout the experiment.