Green Tea

33 mins read

Green tea is a type of tea that is made from Camellia sinensis leaves and buds that have not undergone the very same withering and oxidation process used to make oolong teas and black teas. Green tea originated in China, and since then its production and manufacture has infected other nations in East Asia. [1]

The History & Processing Approaches

The Origin Story

The origin of green tea started in China, tracing back to 2737 B.C. The discovery occurred by mishap when the Chinese Emperor Shennong erroneously consumed water that had a dead tea leaf boiled in it. He found the taste refreshing, and hence, a brand-new drink was born. Green tea was primarily offered to the greatest tiers of Chinese society and was really expensive to purchase. It was not till the 14th century that green tea ended up being available to the public for satisfaction and medical purposes.

Around 800 A.D., during the Tang Dynasty, an innovative book titled “Cha Jing,” also known as “The Classic of Tea,” was written by a Chinese male named Lu Yu. When he was a young boy, Lu Yu was embraced by a Buddhist monk and grew up developing and serving tea. As he grew older, his interest in tea blossomed, and his abilities to make tea enhanced. He chose to require time far from the outside world to research and document his findings. “The Classic of Tea” ended up being the very first composed work to discuss green tea culture and art.

The extremely preferred green tea ultimately traveled West in the 19th century by European explorers. Due to its amazing taste, it was a big product and became Excellent Britain’s national drink, along with black tea. Not long after, green tea made its grand appearance in America when it delivered overseas with the inhabitants. Green tea was called “bullet tea” because it resembled the shape of bullets when shipped. The colonists rapidly obsessed over the tea, and it ended up being so popular that Parliament enforced a Tea Tax in 1767. As all of us understand from our history books, the colonists were rather upset, and the Boston Tea Party occurred. As a result, 45 tons of precious green tea were discarded into the harbor.

In the last couple of years, the popularity of green tea has progressively increased. At most coffee and tea shops, one can discover many green tea drinks varying from a hot jasmine green tea to an iced matcha latte. In addition to its versatile flavors, lots of health discoveries are taking place due to its high variety of antioxidants. The more we learn more about this fantastic tea, the more outstanding and advantageous it becomes.

Green Tea Processing Approaches

Tea originates from the Camellia Sinensis plant. Whether black, green, or white, the amount of oxidation permitted during the drying cycle determines the color of the tea. Green tea is among the leaves with a shorter drying period of about one to two to prevent oxidation. A much shorter drying time guarantees that the leaves maintain their green color. When the moisture evaporates, they shift the leaves to the heating procedure for cooking and curling. The heating methods can vary due to techniques and region. Chinese green teas take the pan firing technique where the tea is pan or wok roasted, leaving them paler in color. The Japanese approach is to deep steam the teas, which gives them a brighter green color. The last step is to roll, curl, or twist the tea leaves by hand to wring out any excess water or sap. This part of the process likewise assists specify the different tea types.

Tea Types (From China):

* There are way more types of green teas than the ones I have listed below. These teas are my preferred and the ones that you will most likely come across.

Gunpowder: It is the most popular kind of Chinese green teas, grown in the Zhejiang Province of China. Gunpowder gets its name because the tea leaves are rolled into tiny pellets and emit a smoky taste.

Dragonwell (Long Jing): Like Gunpowder, this tea grows in the Zhejiang Province of China. The tea leaves are flat, have bright jade color, and has a tidy and mellow taste.

Yun Wu (Cloud & Mist): This tea is grown in the greater elevations of the Zhejiang Province mountains. Due to the higher elevations, the tea leaves get hovered by clouds leading to tea flavor that is light and sweet.

Tea Types (From Japan):

Sencha: The most typical green tea from Japan and one that is typically considered as an “everyday tea.” This tea is straight exposed to sunlight and is processed using the boiling (decoction) method, which gives it a bright grassy flavor.

Jade Dew (Gyokuro): This tea is highly sought after in Japan. The leaves are flat and pointed and unlike Sencha, are grown in the shade. Jade Dew has high levels of chlorophyll and brews a tea that is brilliant green in color and sweet in taste.

Matcha: This is a powdered green tea from the Uji area of Japan. Matcha is made from premium green tea leaves that grow in the shade. The grinding process of the whole leaves offers the tea a lot of flavor and texture and a lot more caffeine than a normal cup of steeped tea. [2]
Gyokuro: The collecting procedure for Gyokuro green tea differs from Sencha as the green leaves are removed from sunshine about three weeks prior to harvest. Without direct sunlight, less photosynthesis occurs, suggesting the leaves retaini strong-flavored amino acids. The leaves are then steamed, dried, and rolled. Gyokuro green tea has a richer flavor and is more costly, provided the extra actions to process it.

Tencha: Tencha is the main ingredient in matcha green tea. Similar to Gyokuro, the green leaves are removed from sunshine three weeks prior to harvest. The leaves are steamed however dried without being rolled. This offers the tea a pale green color and mellow flavor.

Funmatsucha: This range utilizes ground tea leaves that are generally low quality and cheaper in rate. The harvesting is different than Matcha because it receives no defense from the sunlight. The end product is a green tea with a bitter taste.

Fukamushicha: A combination of Sencha, Gyokuro, and Kabusecha green tea leaves, Fukamushicha green tea leaves go through a deep steaming process which creates a deep color and rich flavor.

Konacha: This green tea is made from the small leaves left after Sencha and Gyokuro processing. It is more economical since it is a natural by-product of other tea production and does not require to be cultivated by itself. This green tea has an intense green color and a strong bitter taste.

Bancha: This tea is cultivated and processed the same way as Sencha, but from later harvests. This suggests the green tea is thought about lower grade and because of that is more economical. It has a golden color and a nutty, sweet flavor.

Kukicha: Likewise referred to as a branch tea, Kukicha is made from the stems and veins of tea leaves initially gathered for Sencha and Matcha green teas. It consists of minimal caffeine, is yellow in color, and has a moderate, creamy, sweet taste. [3]

Green tea plant description

The Tea Camellia is a hardy evergreen shrub or small tree that is probably the most extensively grown Camellia on the planet traditionally used for caffeinated teas. They are collected as the leaves emerge beginning early spring and processed in different methods to develop white, green, oolong, and black teas. Smaller sized young leaves and leaf buds are utilized for making green tea, the older bigger leaves for oolong and black tea, and the buds for white tea. There are 2 major varieties. Camellia sinensis var. Sinensis is the Chinese range that has little leaves and is more tolerant of winter durable into USDA Zone 6. C. Sinensis var. Assamica is from the Assam region of northern India with bigger leaves sturdy to zone 7 and south. The differences in taste, color, and scent in between these teas are accomplished by differing the range, environment, harvest, oxidation, and processing.

This plant is slow-growing and easily preserved. Unlike numerous other Camellia types, it is heat and drought tolerant and can carry out well completely sun. The appealing thick dark-green leaves and blooms make it a good plant for screening, foundation planting, hedge, or an appealing outdoor patio or container plant. For optimal tea production, it is best to prune to 4-5′ just before spring growth to encourage shoots. The flowers attract bees and it is slightly resistant to damage by deer.

Insects and Illness: Camellias are vulnerable to infections and some fungal diseases such as dieback, cankers, flower blight, and root rot. Expect scales, aphids, planthoppers, and spider mites. They are specifically problematic on stressed out plants. [4]


Green tea is not a substantial source of calories, vitamins, or minerals per cup. According to the USDA, 8 brewed ounces consists of:.

  • Calories: 2.45
  • Fat: 0g
  • Salt: 2.45 mg
  • Carbohydrates: 0g
  • Protein: 0.5 g

Tea also includes numerous anti-oxidants and percentages of 27 minerals, according to a 2022 evaluation published in Chinese Medication These consist of:.

  1. Potassium, which helps keep you hydrated.
  2. Magnesium, which assists control blood sugar.
  3. Selenium, which supports our immune system.

While the quantities are rather little, they can add up, depending upon your overall everyday green tea intake.


Sipping green tea on the routine might assist avoid some chronic health conditions and handle others. Up until now, research study has actually found green tea:.

May improve psychological health

There is a chemical explanation for why sipping a hot cup of green tea can be so peaceful. Tea– in addition to some mushrooms– includes an amino acid called theanine, which research has actually discovered might:.

  1. Alleviate stress
  2. Cause relaxation
  3. Fight anxiety from caffeine

Green tea in particular has the greatest concentration of theanine compared to other types of tea like oolong, black, and white tea, according to a 2016 study published in Pharmacognosy Publication.

A 2020 review published in Plant Foods for Human Nutrition discovered that taking a 200 to 400 milligrams (mg) supplement of theanine daily reduced tension and anxiety in people exposed to stressful conditions.

Another 2019 research study, released in Nutrients, of 30 people without any significant psychiatric conditions found that those who took 200 mg a day of theanine for 4 weeks saw higher improvements in depression, stress and anxiety, and sleep compared to those who took a placebo.

While both these research studies highlight the possible mental health advantages of theanine, the quantities of theanine they utilized is far more than the amount you would find in a cup or two of green tea.

May boost memory

Research study has likewise discovered that green tea can improve memory, partly thanks to its theanine material. For instance, a 2014 study published in Psychopharmacology of 12 healthy volunteers discovered that green tea extract improved subjects working memory– a type of short-term memory essential for preparation, understanding, reasoning, and analytical.

Clients were provided a milk-based beverage that contained either 27.5 mg green tea extract or a placebo. They then finished certain tasks while an MRI tracked their brain activity. Those who took in the green tea extract saw higher brain connectivity– aka how well different locations of the brain collaborate– as well as enhanced working memory and task performance.

Since the study used such a small sample of patients, the outcomes are less definitive. More research is needed to even more explore how green tea affects memory.

Security versus neurodegenerative illness

Some research has actually discovered drinking green tea can protect against certain neurodegenerative diseases, like Alzheimer’s and Parkinson’s. This is likely due to green tea’s high concentration of powerful substances called antioxidants, according to a 2019 research review published in Molecules. Antioxidants defend cells against damage that, with time, would otherwise result in neurodegenerative diseases.

A 2022 research study released in Frontiers in Nutrition found that after following 1,545 senior people in China with healthy brain working for one year, those who constantly drank tea– including green tea– had lower rates of cognitive decrease compared to non-tea drinkers. This was true even after researchers adjusted for elements like education, smoking, and workout.

Cognitive decline is one of the very first visible signs of Alzheimer’s and related forms of dementia, according to the Centers for Disease Control and Avoidance (CDC). It describes worsening or more regular circumstances of confusion and/or memory loss.

Might reduce cholesterol

About 38% of American grownups have high cholesterol levels, which raises their risk of cardiac arrest and stroke, according to the CDC. The bright side? Green tea may assist.

A 2020 meta-analysis of 31 research studies released in Nutrition Journal found that consuming green tea was related to lower levels of both overall cholesterol and LDL (aka bad) cholesterol.

Can lower high blood pressure

In addition to reducing cholesterol levels, green tea might secure heart health by lowering high blood pressure. A 2020 meta-analysis in Medicine of 1,697 individuals discovered that drinking green tea significantly reduced blood pressure, especially in those with high blood pressure and the best threat of cardiovascular disease.

That’s key since nearly 50% of cardiovascular disease cases and 60% of strokes are because of hypertension, per the National Library of Medicine. If high blood pressure is left untreated, it can likewise result in kidney failure.

Green tea’s capability to lower blood pressure might be due to its high antioxidant material, according to the very same 2020 analysis noted above. These anti-oxidants lower inflammation and dilate blood vessels so blood can flow more quickly.

However, the majority of the research studies examined in the analysis only lasted in between three and sixteen weeks, suggesting it’s not clear how drinking green tea for longer might or may not improve blood pressure.

Might avoid stroke

Stroke remains a leading cause of death and disability for grownups in the United States, according to the CDC. Consuming green tea might be one method to assist avoid your danger of stroke.

For example, a 2020 study in the American Journal of Clinical Nutrition, tracked the tea-drinking routines of almost half a million Chinese adults. It discovered that taking in tea– specifically green tea– was related to a lower threat of stroke. In fact, the more green tea people consumed, the lower their threat of stroke.

Possibly protects bone health

Green tea might also prevent the loss of bone mass. For instance, a 2022 research study published in Nutrients discovered that of practically 6,500 postmenopausal Korean females, those who did not consume any green tea or consumed less than one cup daily for the past year were more likely to have actually lost bone mass in their spine or thigh compared to those who consumed green tea 3 times a day.

Minimized bone mass increases the risk of osteoporosis, a disease that makes bones more vulnerable and can result in fractures of the hip, spine, or wrist, per the National Library of Medication. Postmenopausal ladies in particular are at a greater risk of establishing osteoporosis.

This might explain why a 2017 analysis released in Medicine concluded that tea consumption was linked to a lowered risk of osteoporosis, likely due to its high concentration of antioxidants which assist avoid bone loss and enhance bone formation.

Helps prevent and manage type 2 diabetes

Consuming tea– consisting of green tea– may be a reliable method to prevent and handle type 2 diabetes, according to a 2019 evaluation released in Antioxidants. The evaluation discovered that green tea antioxidants, in particular, might lower insulin resistance.

Insulin resistance occurs when cells are less conscious the hormone insulin, which helps cells convert blood sugar to energy. It is among the major risk factors for developing type 2 diabetes, according to the CDC.

Enhanced longevity

Drinking tea, consisting of green tea, is associated with a longer and much healthier life, according to 2020 research study published in the European Journal of Preventive Cardiology.

The study followed 100,902 participants in China with no history of heart attack, stroke, or cancer for over 7 years. It organized participants as either:.

Habitual tea drinkers, implying they took in tea 3 or more times a week.

Non-habitual tea drinkers, indicating they took in tea less than 3 times a week.

Compared to non-habitual tea drinkers, those who consumed tea three or more times a week had actually a minimized risk of death from all causes. They likewise had actually a reduced threat of establishing atherosclerotic heart disease, which is when plaque builds up in blood vessels, increasing the danger of cardiac arrest or stroke, according to the American Heart Association (AHA).

Green tea, in particular, was related to a lower danger of dying from all causes except for coronary cardiovascular disease. Researchers think this is likely due to anti-oxidants in green tea protecting cells from damage that would otherwise cause disease. [5]

Teas to avoid

While a majority of teas are beneficial for your health, you may want to stay away from these ranges:.

Detox teas made for fad diets that suggest you will quickly slim down. These teas often come laced with laxatives that can be harmful to your health.

Fancy tea lattes and beverages from your preferred chain store. While some of these beverages, such as a green tea latte, might appear healthy, they are packed with sugar.

Trendy bubble teas that are also packed with sugar, calories and carbs, and have little to no dietary value.

Natural teas that might possibly activate allergic reactions. Lots of organic teas include different kinds of fruits, herbs, spices and flowers that some people are allergic to. If you have allergic reactions, always check out the active ingredients on the package prior to you take in a new natural tea. [6]

Readily available Kinds

Most green tea dietary supplements are offered as dried leaf tea in capsule type. Search for standardized extracts of green tea. There are also liquid extracts made from the leaves and leaf buds. The typical cup of green tea includes 50 to 150 mg polyphenols (antioxidants). Decaffeinated green tea items contain focused polyphenols. Caffeine-free supplements are readily available.

How to Take It


Green tea has not been studied in children, so it is not suggested for pediatric use.


Depending upon the brand, 2 to 3 cups of green tea each day (for a total of 240 to 320 mg polyphenols) or 100 to 750 mg per day of standardized green tea extract is advised. Caffeine-free products are available and recommended. [7]

Adverse effects

When taken by mouth: Green tea is frequently taken in as a beverage. Consuming green tea in moderate quantities (about 8 cups everyday) is likely safe for many people. Green tea extract is potentially safe when considered as much as 2 years or when used as a mouthwash, short-term.

Drinking more than 8 cups of green tea everyday is potentially hazardous. Consuming big quantities might cause side effects due to the caffeine material. These adverse effects can vary from mild to severe and consist of headache and irregular heart beat. Green tea extract also contains a chemical that has been related to liver injury when utilized in high dosages.

When applied to the skin: Green tea extract is likely safe when an FDA-approved ointment is used, short-term. Other green tea products are possibly safe when used properly.

Unique Preventative Measures and Warnings

  • Pregnancy: Drinking green tea is possibly safe in quantities of 6 cups each day or less. This quantity of green tea offers about 300 mg of caffeine. Drinking more than this amount during pregnancy is possibly unsafe and has actually been connected to an increased threat of miscarriage and other negative impacts. Likewise, green tea might increase the risk of birth defects connected with folic acid deficiency.
  • Breast-feeding: Caffeine enters breast milk and can affect a nursing infant. Carefully monitor caffeine intake to make certain it is on the low side (2-3 cups daily) while breast-feeding. High consumption of caffeine while breast-feeding can cause sleep issues, irritation, and increased bowel activity in breast-fed babies.
  • Children: Green tea is possibly safe for children when taken by mouth in amounts commonly found in foods and beverages, or when gargled three times daily for up to 90 days. There isn’t enough trustworthy info to understand if green tea extract is safe when taken by mouth in kids. There’s some issue that it might cause liver damage.
  • Anemia: Consuming green tea might make anemia worse.
  • Anxiety disorders: The caffeine in green tea may make anxiety even worse.
  • Bleeding conditions: The caffeine in green tea may increase the risk of bleeding. Don’t drink green tea if you have a bleeding condition.
  • Heart conditions: When taken in big quantities, the caffeine in green tea might trigger irregular heartbeat.
  • Diabetes: The caffeine in green tea might affect blood sugar level control. If you consume green tea and have diabetes, monitor your blood glucose thoroughly.
  • Diarrhea: The caffeine in green tea, especially when taken in big quantities, can intensify diarrhea.
  • Seizures: Green tea contains caffeine. High dosages of caffeine might trigger seizures or decrease the impacts of substance abuse to prevent seizures. If you have ever had a seizure, don’t use high doses of caffeine or caffeine-containing products such as green tea.
  • Glaucoma: Drinking green tea increases pressure inside the eye. The increase occurs within thirty minutes and lasts for at least 90 minutes.
  • Hypertension: The caffeine in green tea may increase high blood pressure in individuals with hypertension. However this impact might be less in individuals who take in caffeine from green tea or other sources regularly.
  • Irritable bowel syndrome (IBS): Green tea contains caffeine. The caffeine in green tea, especially when taken in large quantities, may aggravate diarrhea in some people with IBS.
  • Liver illness: Green tea extract supplements have been connected to unusual cases of liver damage. Green tea extracts may make liver disease worse. Talk with your medical professional prior to taking green tea extract. Drinking green tea in normal amounts is still probably safe.
  • Weak bones (osteoporosis): Consuming green tea can increase the quantity of calcium that is flushed out in the urine. This might compromise bones. If you have osteoporosis, do not consume more than 6 cups of green tea everyday. If you are typically healthy and get enough calcium from your food or supplements, drinking about 8 cups of green tea daily doesn’t appear to increase the threat of getting osteoporosis. [8]


Daily intake of 3 to 5 cups/day (720 to 1,200 ml) of green tea offers at least 180 mg of catechins and at least 60 mg of theanine. Green tea extract need to not be taken on an empty stomach due to the capacity for hepatotoxicity from extreme levels of epigallocatechin gallate (EGCG).

  • Anogenital warts: Topical application of sinecatechins (polyphenon E 10% or 15%) was utilized for up to 16 weeks in a clinical research study.
  • Cardiovascular risks: Green tea catechins or extract (160 to 2,488 mg/day) have actually been utilized in trials, frequently in divided does (treatment duration, 2 weeks to 3 months).
  • Cognitive impairment: Two 430 mg capsules (each pill containing green tea extract 360 mg and L-theanine 60 mg) administered two times daily, thirty minutes after meals, for 16 weeks (overall day-to-day green tea extract dose, 1,440 mg; overall everyday L-theanine dosage, 240 mg).
  • Anxiety: 2 to 4 or more cups/day of green tea has been used to reduce the occurrence of depressive signs.
  • Diabetes: An EGCG dosage variety of 84 to 386 mg/day may be adequate to support glucose homeostasis, based on readily available literature.
  • Obesity: ECGC 400 mg two times daily for 8 weeks was utilized in one clinical trial; green tea extract tablets (consisting of 125 mg of catechins) and an everyday green tea catechin beverage (consisting of 625 mg of catechins) have also been utilized in studies of obese and obese grownups. [9]


Green tea has a range of possible health benefits.

To assist you feel much better, slim down, and lower your danger of persistent diseases, you might wish to consider making green tea a regular part of your life. [10]


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