Green Tea

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

The History & Processing Methods

The Origin Story

The origin of green tea started in China, tracing back to 2737 B.C. The discovery took place by accident when the Chinese Emperor Shennong mistakenly drank water that had a dead tea leaf boiled in it. He discovered the taste refreshing, and thus, a brand-new drink was born. Green tea was primarily readily available to the greatest tiers of Chinese society and was extremely costly to acquire. It was not until the 14th century that green tea became accessible to the public for satisfaction and medical purposes.

Around 800 A.D., during the Tang Dynasty, an ingenious book titled “Cha Jing,” likewise called “The Classic of Tea,” was written by a Chinese male named Lu Yu. When he was a young kid, Lu Yu was embraced by a Buddhist monk and matured brewing and serving tea. As he grew older, his interest in tea blossomed, and his abilities to make tea better. He chose to take time far from the outside world to research and jot down his findings. “The Classic of Tea” ended up being the very first written work to discuss green tea culture and art.

The extremely preferred green tea ultimately took a trip West in the 19th century by European explorers. Due to its extraordinary taste, it was a substantial product and ended up being Fantastic Britain’s national beverage, in addition to black tea. Right after, green tea made its grand look in America when it delivered overseas with the inhabitants. Green tea was called “bullet tea” due to the fact that it resembled the shape of bullets when delivered. The colonists rapidly consumed over the tea, and it ended up being so popular that Parliament enforced a Tea Tax in 1767. As we all know from our history books, the colonists were quite upset, and the Boston Tea ceremony occurred. As a result, 45 lots of valuable green tea were discarded into the harbor.

In the last couple of decades, the appeal of green tea has actually gradually 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 tastes, numerous health discoveries are happening due to its high number of anti-oxidants. The more we learn about this fantastic tea, the more impressive and beneficial it ends up being.

Green Tea Processing Methods

Tea comes from the Camellia Sinensis plant. Whether black, green, or white, the quantity of oxidation enabled throughout the drying cycle determines the color of the tea. Green tea is among the leaves with a much shorter drying duration of about one to 2 to prevent oxidation. A shorter drying time ensures that the leaves keep their green color. When the moisture evaporates, they shift the leaves to the heating procedure for cooking and curling. The heating approaches can differ due to strategies and area. Chinese green teas take the pan firing method where the tea is pan or wok roasted, leaving them paler in color. The Japanese technique is to deep steam the teas, which provides a brighter green color. The last action 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 helps 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 favorite and the ones that you will most likely discovered.

Gunpowder: It is the most popular type of Chinese green teas, grown in the Zhejiang Province of China. Gunpowder gets its name since the tea leaves are rolled into small pellets and give off a smoky taste.

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

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

Tea Types (From Japan):

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

Jade Dew (Gyokuro): This tea is extremely searched for 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 flavor.

Matcha: This is a powdered green tea from the Uji area of Japan. Matcha is made from high-quality green tea leaves that grow in the shade. The grinding process of the entire leaves offers the tea a lot of taste and texture and much more caffeine than a typical cup of steeped tea. [2]
Gyokuro: The harvesting procedure for Gyokuro green tea varies from Sencha as the green leaves are removed from sunlight about 3 weeks before harvest. Without direct sunlight, less photosynthesis takes place, meaning 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 additional actions to process it.

Tencha: Tencha is the main ingredient in matcha green tea. Comparable to Gyokuro, the green leaves are eliminated from sunshine 3 weeks prior to harvest. The leaves are steamed but dried without being rolled. This gives the tea a pale green color and mellow flavor.

Funmatsucha: This range utilizes ground tea leaves that are usually low quality and less expensive in cost. The harvesting is various than Matcha in that it receives no security from the sunlight. Completion item is a green tea with a bitter flavor.

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

Konacha: This green tea is made from the small leaves left behind after Sencha and Gyokuro processing. It is more economical due to the fact that 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 affordable. It has a golden color and a nutty, sweet flavor.

Kukicha: Also described as a twig tea, Kukicha is made from the stems and veins of tea leaves at first harvested for Sencha and Matcha green teas. It consists of very little caffeine, is yellow in color, and has a moderate, velvety, sweet flavor. [3]

Green tea plant description

The Tea Camellia is a sturdy evergreen shrub or little tree that is probably the most widely grown Camellia on the planet generally used for caffeinated teas. They are harvested as the leaves emerge beginning early spring and processed in different methods to produce white, green, oolong, and black teas. Smaller sized young leaves and leaf buds are utilized for making green tea, the older larger leaves for oolong and black tea, and the buds for white tea. There are 2 significant ranges. Camellia sinensis var. Sinensis is the Chinese variety that has small 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 durable to zone 7 and south. The differences in taste, color, and fragrance between these teas are achieved by varying the variety, environment, harvest, oxidation, and processing.

This plant is slow-growing and easily maintained. Unlike many other Camellia species, it is heat and drought tolerant and can carry out well completely sun. The attractive dense dark-green leaves and flowers make it an excellent plant for screening, foundation planting, hedge, or an appealing patio or container plant. For ideal tea production, it is best to prune to 4-5′ right before spring growth to encourage shoots. The flowers attract bees and it is slightly resistant to damage by deer.

Bugs and Illness: Camellias are susceptible to viruses and some fungal diseases such as dieback, cankers, flower blight, and root rot. Expect scales, aphids, planthoppers, and spider termites. They are specifically troublesome on stressed plants. [4]


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

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

Tea likewise includes various antioxidants and percentages of 27 minerals, according to a 2022 evaluation published in Chinese Medicine These consist of:.

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

While the quantities are rather small, they can add up, depending upon your overall daily green tea consumption.


Sipping green tea on the regular may help avoid some persistent health conditions and handle others. Up until now, research has actually discovered green tea:.

May enhance mental health

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

  1. Eliminate stress
  2. Cause relaxation
  3. Battle stress and anxiety from caffeine

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

A 2020 evaluation released in Plant Foods for Human Nutrition found that taking a 200 to 400 milligrams (mg) supplement of theanine everyday minimized stress and stress and anxiety in people exposed to difficult conditions.

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

While both these studies highlight the possible psychological health benefits of theanine, the amounts of theanine they utilized is a lot more than the amount you would find in a cup or more of green tea.

Might boost memory

Research has actually also discovered that green tea can enhance memory, partly thanks to its theanine material. For instance, a 2014 study published in Psychopharmacology of 12 healthy volunteers found that green tea extract enhanced subjects working memory– a type of short-term memory important for preparation, understanding, thinking, and problem-solving.

Clients were offered a milk-based drink which contained either 27.5 mg green tea extract or a placebo. They then finished specific jobs while an MRI tracked their brain activity. Those who consumed the green tea extract saw greater brain connection– aka how well different areas of the brain interact– as well as enhanced working memory and task efficiency.

Because the study utilized such a little sample of patients, the outcomes are less conclusive. More research study is required to even more check out how green tea affects memory.

Security versus neurodegenerative illness

Some research has discovered drinking green tea can safeguard versus certain neurodegenerative illness, 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 study evaluation published in Molecules. Antioxidants protect cells versus damage that, over time, would otherwise lead to neurodegenerative diseases.

A 2022 research study released in Frontiers in Nutrition discovered that after following 1,545 elderly individuals in China with healthy brain working for one year, those who habitually consumed tea– including green tea– had lower rates of cognitive decline compared to non-tea drinkers. This was true even after researchers changed for aspects like education, smoking, and exercise.

Cognitive decline is among the very first obvious symptoms of Alzheimer’s and related kinds of dementia, according to the Centers for Disease Control and Avoidance (CDC). It refers to intensifying or more frequent instances of confusion and/or amnesia.

Could lower cholesterol

About 38% of American grownups have high cholesterol levels, which raises their danger of heart attack and stroke, according to the CDC. The bright side? Green tea might assist.

A 2020 meta-analysis of 31 research studies published in Nutrition Journal discovered that taking in green tea was connected with lower levels of both overall cholesterol and LDL (aka bad) cholesterol.

Can reduce 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 substantially decreased high blood pressure, especially in those with high blood pressure and the best risk of cardiovascular disease.

That’s crucial because nearly 50% of heart problem cases and 60% of strokes are due to hypertension, per the National Library of Medicine. If high blood pressure is left untreated, it can likewise lead to kidney failure.

Green tea’s capability to lower high blood pressure might be due to its high antioxidant content, according to the same 2020 analysis noted above. These anti-oxidants lower swelling and dilate blood vessels so blood can stream more easily.

Nevertheless, most of the research studies examined in the analysis just lasted in between 3 and sixteen weeks, indicating it’s not clear how drinking green tea for longer might or may not improve high blood pressure.

Might avoid stroke

Stroke stays a leading cause of death and impairment for grownups in the United States, according to the CDC. Drinking green tea might be one way to help avoid your danger of stroke.

For example, a 2020 study in the American Journal of Clinical Nutrition, tracked the tea-drinking practices of nearly half a million Chinese grownups. It found that consuming tea– specifically green tea– was associated with a lower threat of stroke. In fact, the more green tea individuals consumed, the lower their danger of stroke.

Potentially secures bone health

Green tea may likewise prevent the loss of bone mass. For example, a 2022 research study published in Nutrients found that of almost 6,500 postmenopausal Korean ladies, those who did not take in any green tea or consumed less than one cup daily for the past year were more likely to have lost bone mass in their spine or thigh compared to those who drank green tea 3 times a day.

Minimized bone mass increases the risk of osteoporosis, a disease that makes bones more delicate and can lead to fractures of the hip, spine, or wrist, per the National Library of Medication. Postmenopausal women in particular are at a greater risk of developing osteoporosis.

This might explain why a 2017 analysis published in Medicine concluded that tea intake was linked to a decreased threat of osteoporosis, likely due to its high concentration of anti-oxidants which help prevent bone loss and enhance bone formation.

Helps prevent and handle type 2 diabetes

Consuming tea– consisting of green tea– may be an efficient way to prevent and manage type 2 diabetes, according to a 2019 evaluation published in Anti-oxidants. The review found that green tea antioxidants, in particular, might lower insulin resistance.

Insulin resistance happens when cells are less sensitive to the hormone insulin, which assists cells transform blood sugar level to energy. It is one of the major threat elements for establishing type 2 diabetes, according to the CDC.

Improved longevity

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

The study followed 100,902 participants in China with no history of cardiovascular disease, stroke, or cancer for over 7 years. It grouped individuals as either:.

Regular tea drinkers, suggesting they consumed tea 3 or more times a week.

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

Compared to non-habitual tea drinkers, those who drank tea 3 or more times a week had a reduced risk of death from all causes. They likewise had a reduced threat of developing atherosclerotic heart disease, which is when plaque develops in blood vessels, increasing the danger of cardiac arrest or stroke, according to the American Heart Association (AHA).

Green tea, in particular, was associated with a lower threat of dying from all causes except for coronary heart problem. Researchers believe this is likely due to anti-oxidants in green tea safeguarding cells from damage that would otherwise result in disease. [5]

Teas to avoid

While a bulk of teas are beneficial for your health, you might want to avoid these varieties:.

Detox teas produced fad diets that recommend you will rapidly lose weight. These teas typically come laced with laxatives that can be harmful to your health.

Fancy tea lattes and beverages from your favorite chain store. While a few of these beverages, such as a green tea latte, may appear healthy, they are filled with sugar.

Stylish bubble teas that are likewise loaded with sugar, calories and carbs, and have little to no nutritional value.

Natural teas that might potentially activate allergic reactions. Lots of organic teas consist of various kinds of fruits, herbs, spices and flowers that some people dislike. If you have allergic reactions, constantly read the components on the plan prior to you consume a new organic tea. [6]

Offered Types

Most green tea dietary supplements are offered as dried leaf tea in capsule form. Look 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 available.

How to Take It


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


Depending on the brand name, 2 to 3 cups of green tea per day (for an overall of 240 to 320 mg polyphenols) or 100 to 750 mg daily of standardized green tea extract is advised. Caffeine-free items are available and recommended. [7]

Negative effects

When taken by mouth: Green tea is frequently consumed as a drink. Drinking green tea in moderate amounts (about 8 cups daily) is likely safe for many people. Green tea extract is perhaps safe when considered up to 2 years or when used as a mouthwash, short-term.

Consuming more than 8 cups of green tea everyday is perhaps hazardous. Drinking big amounts may trigger negative effects due to the caffeine content. These negative effects can vary from moderate to major and consist of headache and irregular heartbeat. Green tea extract likewise contains a chemical that has been related to liver injury when used in high dosages.

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

Unique Preventative Measures and Warnings

  • Pregnancy: Consuming green tea is perhaps safe in amounts of 6 cups each day or less. This quantity of green tea offers about 300 mg of caffeine. Consuming more than this amount during pregnancy is possibly hazardous and has been linked to an increased risk of miscarriage and other negative effects. Also, green tea may increase the threat of abnormality associated with folic acid deficiency.
  • Breast-feeding: Caffeine passes into breast milk and can impact a nursing infant. Closely keep an eye on caffeine consumption to ensure it is on the low side (2-3 cups per day) while breast-feeding. High consumption of caffeine while breast-feeding can cause sleep issues, irritation, and increased bowel activity in breast-fed babies.
  • Kids: Green tea is possibly safe for kids when taken by mouth in amounts frequently discovered in foods and drinks, or when gargled 3 times daily for as much as 90 days. There isn’t sufficient trustworthy information to understand if green tea extract is safe when taken by mouth in children. There’s some concern that it might cause liver damage.
  • Anemia: Drinking green tea may make anemia even worse.
  • Stress and anxiety conditions: The caffeine in green tea might make stress and anxiety worse.
  • Bleeding disorders: The caffeine in green tea might increase the danger of bleeding. Do not consume green tea if you have a bleeding disorder.
  • Heart conditions: When taken in big amounts, the caffeine in green tea may trigger irregular heart beat.
  • Diabetes: The caffeine in green tea might affect blood sugar level control. If you drink green tea and have diabetes, monitor your blood glucose carefully.
  • Diarrhea: The caffeine in green tea, especially when taken in large amounts, can intensify diarrhea.
  • Seizures: Green tea contains caffeine. High dosages of caffeine might trigger seizures or reduce the impacts of substance abuse to prevent seizures. If you have ever had a seizure, do not utilize high dosages of caffeine or caffeine-containing products such as green tea.
  • Glaucoma: Consuming green tea increases pressure inside the eye. The boost takes place within thirty minutes and lasts for at least 90 minutes.
  • Hypertension: The caffeine in green tea might increase blood pressure in individuals with hypertension. But this effect might be less in individuals who take in caffeine from green tea or other sources frequently.
  • Irritable bowel syndrome (IBS): Green tea consists of caffeine. The caffeine in green tea, specifically when taken in large quantities, might get worse diarrhea in some people with IBS.
  • Liver illness: Green tea extract supplements have been linked to uncommon cases of liver damage. Green tea extracts may make liver illness worse. Talk with your medical professional prior to taking green tea extract. Drinking green tea in normal quantities is still probably safe.
  • Weak bones (osteoporosis): Consuming green tea can increase the amount of calcium that is eliminated in the urine. This may compromise bones. If you have osteoporosis, do not drink more than 6 cups of green tea daily. If you are typically healthy and get enough calcium from your food or supplements, drinking about 8 cups of green tea daily does not seem to increase the danger 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 a minimum of 60 mg of theanine. Green tea extract must not be handled 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 approximately 16 weeks in a clinical research study.
  • Cardiovascular risks: Green tea catechins or extract (160 to 2,488 mg/day) have actually been used in trials, often in divided does (treatment period, 2 weeks to 3 months).
  • Cognitive problems: 2 430 mg pills (each capsule including 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; total everyday L-theanine dosage, 240 mg).
  • Anxiety: 2 to 4 or more cups/day of green tea has actually been utilized to reduce the prevalence of depressive signs.
  • Diabetes: An EGCG dose range of 84 to 386 mg/day may be adequate to support glucose homeostasis, based upon offered literature.
  • Obesity: ECGC 400 mg twice daily for 8 weeks was used in one clinical trial; green tea extract tablets (consisting of 125 mg of catechins) and a daily green tea catechin drink (consisting of 625 mg of catechins) have likewise been used in studies of obese and obese grownups. [9]


Green tea has a range of possible health benefits.

To help you feel better, reduce weight, and lower your danger of persistent illness, you might wish to consider making green tea a regular part of your life. [10]


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