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Green tea: Health advantages, unwanted effects, and research

Green tea, native to China and India, has been consumed and hailed for its health benefits for centuries globally, but has only recently gained popularity in the United States.
Tea is the most consumed beverage in the world behind water. However, 78 percent of the tea consumed worldwide is black and only about 20 percent is green.

All types of tea, except herbal tea, are brewed from the dried leaves of the Camellia sinensis bush. The level of oxidation of the leaves determines the type of tea.

Green tea is made from unoxidized leaves and is one of the less processed types of tea. It therefore contains the most antioxidants and beneficial polyphenols.
Fast facts on green tea
Here are some key points about green tea. More detail and supporting information is in the main article.
green tea has been used in traditional Indian and Chinese medicine
there are many different types of green tea available
green tea may help prevent a range of ailments including cancer
more research is needed to prove many of the ongoing health statements surrounding green tea.

Benefits

Listed are the feasible health benefits connected with green tea below. Green tea was found in traditional Chinese and Indian medication to regulate heal and bleeding wounds, aid digestion, improve center and mental wellness, and regulate body's temperature.

Recent studies have demonstrated green tea could have results on from weight loss to liver disorders, type 2 diabetes, and Alzheimer's disease.

It is important to note that more evidence is required before these possible health benefit links are proved definitive:

1) Green tea and cancer prevention

According to the National Cancer Institute, the polyphenols in tea have been shown to decrease tumor growth in laboratory and pet studies and could protect against damage due to ultraviolet UVB radiation.

In countries where green tea extract consumption is definitely high, cancer rates have a tendency to be lower, nonetheless it is impossible to learn for sure whether it's the green tea extract that prevents cancer in these specific populations or additional lifestyle factors.

Some studies also have demonstrated the positive impacts of green tea extract on the next types of cancer:

• breast
• bladder
• ovarian
• colorectal (bowel)
• esophageal (throat)
• lung
• prostate
• skin
• stomach

Researchers believe it's the higher level of polyphenols in tea that assists kill cancerous cells and prevent them from growing. Nevertheless, the specific mechanisms where tea interacts with cancerous cells can be unknown.

However, other studies have not found that tea can reduce cancer risk. The amount of tea required for cancer-preventive effects also varies widely in studies - from 2-10 cups per day.

In 2005, the Food and Drug Administration (FDA) stated, "there is no credible evidence to support qualified health claims for green tea consumption and a reduced risk of gastric, lung, colon/rectal, esophageal, pancreatic, ovarian, and combined cancers."

2) Green tea heart benefits

A 2006 study published in the Journal of the American Medical Association concluded that green tea consumption is connected with reduced mortality because of all causes, including coronary disease.

The scholarly study followed over 40,000 Japanese participants between your ages of 40 and 79 for 11 years, starting in 1994.

The individuals who drank at least 5 cups of green tea extract each day had a considerably lower threat of dying (especially from coronary disease) than those that drank less than one glass of tea per day.

Green tea extract contains catechins, polyphenolic compounds that are believed to exert numerous protecting effects, particularly about the cardiovascular system.

3) Green tea and lower cholesterol

An analysis of published studies in 2011 found that consuming green tea, either as a beverage or in capsule form, was linked to significant but modest reductions in total and LDL or "bad" cholesterol.

4) Stroke risk and green tea

Drinking green tea or coffee on a regular basis is associated with a reduced risk of stroke, according to a study published in the journal Stroke: Journal of the American Heart Association.

The lead author of the scholarly study, Dr. Yoshihiro Kokubo, Ph.D., said, "This is actually the first large-scale research to examine the mixed effects of both green tea extract and espresso on stroke dangers. You may make a little but positive lifestyle modification to help lower the chance of stroke with the addition of daily green tea extract to your daily diet."

5) Green tea extract for type 2 diabetes

Studies concerning the romantic relationship between green diabetes and tea have already been inconsistent. Some have demonstrated a lower threat of developing type 2 diabetes for green tea extract drinkers than for those who consumed no tea, while other studies have found no association between tea consumption and diabetes at all.

6) Green tea and weight loss

Green tea may promote a small, non-significant weight loss in overweight and obese adults; however, since weight loss in the studies was so minimal, it really is unlikely that green tea extract is very important to weight loss clinically.

7) Green tea extract and inflammatory skin diseases

A 2007 study figured green tea extract could hold guarantee as a fresh treatment for epidermis disorders such as for example psoriasis and dandruff. Experts studied an pet model for inflammatory epidermis diseases, seen as a patches of dry frequently, red, flaky skin due to the overproduction and inflammation of skin cells. Those treated with green tea extract showed slower development of skin cells and the presence of a gene that regulates the cells' life cycles.

8) Working memory and the effects of green tea

Research published in the journal Psychopharmacology suggests that green tea can enhance our brain's cognitive functions, particularly the working memory.

The research team said their findings suggest that green tea could be promising in the treatment of cognitive impairments associated with neuropsychiatric disorders, such as dementia.

9) Green tea and Alzheimer's

In a scholarly study published in 2011, researchers tested the result of an element of green tea extract, CAGTE (or "colon available" teas), after it turned out digested, to observe how it damaged an integral protein in Alzheimer's disease.

The Alzheimer's Society commented that "this study adds to previous research that suggests green tea might help to reduce the risk of Alzheimer's disease. However, the researchers used a much higher dose of the active green tea chemical than would ever be found in the human body. More research is needed to observe whether green tea is protective at a much lower dose, and to understand the mechanism involved."

Other studies have found that green tea might be helpful in avoiding dental care cavities, stress, chronic fatigue, treating skin conditions, and enhancing arthritis by reducing inflammation.

Nutrition

Unsweetened brewed green tea extract can be a zero calorie beverage. The caffeine within a glass of tea may differ in accordance with the amount of infusing time and the amount of tea infused. In general, green tea contains a relatively small amount of caffeine (approximately 20-45 milligrams per 8 ounce cup), compared with black tea, which contains about 50 milligrams and coffee with 95 milligrams per cup.

Green tea is considered one of the world's healthiest drinks and contains one of the highest amounts of antioxidants of any tea. Natural chemicals called polyphenols in tea are what are considered to provide its anti-carcinogenic and anti-inflammatory effects. Green tea is normally 20-45 percent polyphenols by weight around, which 60-80 percent are catechins such as for example EGCG. Catechins are antioxidants that are thought to assist in preventing cell damage.

Types

Green tea comes in many types, including:

• sweetened and bottled with sugars or an artificial sweetener
• in single tea bags
• as loose-leaf
• in instant-powder
• green tea supplements, which can be purchased in capsule liquid or form extracts

According to 2010 study presented at the American Chemical Society, bottled teas are not equivalent to brewed teas because some 16 ounce bottled teas can consist of fewer polyphenols than one cup of brewed tea.

Side effects and risks

There are small to simply no known side contraindications or effects to drinking green tea extract for adults. However, the next risks or issues ought to be made clear:

• Caffeine sensitivity - people that have serious caffeine sensitivities could knowledge insomnia, nervousness, irritability, nausea, or upset tummy.

• Bloodstream thinners - those taking bloodstream thinners (anticoagulant medications) such as for example Coumadin/warfarin should drink green tea extract with caution because of its vitamin K articles. It is also recommended to prevent green tea extract and aspirin, because they both decrease the clotting efficiency of platelets.

• Various other stimulants - if taken with stimulant drugs, green tea could increase blood pressure and heart rate.

Green tea extract supplements contain high degrees of active substances that may trigger side interact and effects with various other herbs, supplements, or medications.

Green tea extract supplements are unregulated by the FDA and could also contain various other substances unsafe for health or with unproven health advantages. Check with a doctor prior to starting any dietary supplement or herb regimen.

In particular, breastfeeding or pregnant women, people that have heart disease or high blood circulation pressure, liver or kidney problems, stomach ulcers, or anxiety disorders shouldn't take green tea extract extracts or supplements.

Further reading on green tea extract

Various green tea products are available to purchase online. It is a good idea to evaluate different brands, and various types of green tea extract, to opt for the the most suitable one for you.

Perhaps you have enjoyed reading regarding the potential health advantages of green tea? Have a look at our assortment of articles about other fruit and veggies. Alternatively, read our content about the very best 10 well balanced meals for your daily food diet.