Cancer and Japanese Green Tea - Why It is Good for Treatment and Prevention

by Kei Nishida

Cancer and Japanese Green Tea - Why It is Good for Treatment and Prevention

Japanese green tea has been known to have major health benefits for many years. Many medical experts believe that it increases stamina, sharpens the mind and can extend the lifespan. It has been proven to aid the immune system has fat burning properties and helps to fight off disease. Newer health studies have shown evidence the Japanese green tea might actually prevent or reduce the effects of certain types of cancer.

Green tea can protect your body from harmful fats, aid in digestion, protect the brain and liver and promotes healthy gums. It is also known to reduce blood pressure, defend against diabetes, reduce the chance of a heart attack and lower cholesterol levels. It is high in antioxidants and it is becoming increasingly evident that green tea seems to inhibit the growth of certain types of cancer.

Green Tea's Cancer-fighting Properties

Tea is the most popular drink on Earth next to water. In around 80% of the world, most people prefer to drink black tea rather than green tea. This makes comparative studies fairly simple to conduct on a rudimentary level.

In Japan, green tea is very popular and it is embedded in the culture and day-to-day life. The World Health Organization has reported that Americans are three times more likely to get breast cancer than people in Japan. It is also consumed in China and other Asian countries who also have much lower rate of breast and prostate cancer.

Japan has an overall low rate of cancer, even though smoking is very popular and has traditionally been linked to lung cancer. These findings suggest that green tea seems to have benefited the health of entire countries, even those high in pollution and smoking. The fact that most people in Japan and China are thin suggests that the fat burning agents in green tea are potent.  (Read more about Japanese Green Tea and Diet in my other article)

The Science of Green Tea and Why it Works

There are chemicals in Japanese green tea known as polyphenols. There is evidence to suggest that these agents block certain proteins that helps cancer to spread and growth. The two proteins most affected are the vascular endothelial and the hepatocyte growth factors, both of which are main factors in cancer promotion.

There is also evidence that specific green tea polyphenols like EGCG fight enzymes that are necessary for cancer to grow. Even better, they also seem to kill other cancer cells without harming the rest of the body and interior organs.

EGCG is one of the antioxidants that are similar to Vitamin E and Vitamin C, except that it is much more powerful. There was a study done at the University of Kansas which proved that it is twice as strong as the cancer-killing resveratrol. Resveratrol is found in purple grapes and it has been a staple of cancer-fighting diets for years.

EGCG works in concert with an amino acid called L-Theanine. L-Theanine is the agent in green tea that makes you feel relaxed and can put you in an alert, calm state. It is known to enhance concentration while reducing feelings of stress and thus it is very popular among students, lawyers and people who work in high-stress environments. L-Theanine is not commonly found in most foods or drinks. It can only be obtained through black and green tea.  (Read more about this topic on my another article - Science Behind Why Japanese Green Tea is Good for Health or more about EGCG and Polyphenols)

Green Tea Treatments and Research Findings

In a study from the Louisiana State University Health Sciences Center involving patients with prostate cancer, it was shown that green tea seems to help fight the disease in the early stages before it has spread. The green tea seemed to reduce the growth rate of tumors to a noticeable degree. It seems to be most effective in the early stages of prostate, breast and lung cancer.

The men who participated in the prostate cancer study were asked to drink six cups of green tea each day. Those who did so were found to have much lower levels of prostate-specific antigen, which is an agent that causes tumors to grow.

In a study at the Columbia University Medical Center, a study was run where women with breast cancer were given green tea polyphenols. These chemicals actually lowered the rate of tumor growth over a period of two months. As the study went on, the scientists tried to determine the optimum amount of tea for maximum beneficial effect. They believed that 6-8 cups of green tea per day achieves the optimal results.

How Much Green Tea is Safe to Drink Each Day?

Too much of anything is bad for you. The question is, how much green tea is safe to drink? Tea contains caffeine which is linked to insomnia, headaches, nausea and more. Physicians agree that adults can consume up to 400 mg of green tea per day. That is the equivalent of 8 cups of green tea, and that's a conservative estimate. The true number could be as high a 16 cups per day. In most cases, the increase in caffeine intake does not lead to any substantial issues partly because green tea is much lower in caffeine than black tea and other types of drinks.

Japanese green tea is also a good choice because it is lower in fluoride than other type of tea. In Japan, there is less fluoride in the soil than in other places such as China. The medical community has found in recent years that fluoride is unhealthy when consumed in large doses and intake needs to be monitored carefully. Many people have it in their drinking water, meaning that tea drinkers are getting a double dose.

The Best Way to Consume Green Tea

To get the most out of your green tea, you should know that the form it comes in is important. Many believe that loose leaf tea is the most beneficial form of green tea. To make it, you can put tea leaves in a teapot and add boiling water. Let it steep for a minute or two, and then strain out the leaves while you pour it into the cup.

You could also use a tea maker, which have built-in filters or you could try using a tea filter, which is a tea bag that you put leaves into yourself. Some people prefer to use a tea ball.  You can download our brewing technique book to learn more by clicking here. 

Green tea can be part of a plan to prevent or fight cancer. It also promotes health in a staggering variety of ways and should certainly be included in the diet of anyone looking to improve or maintain their health.

Following product (Issaku) is very popular among cancer patients due to its natural sweet taste and high in cancer-fighting elements mentioned above. Click here to view more about Issaku Japanese Green Tea.


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If you have ever thought that Green Tea is an “acquired taste” or that it is “too bitter” to enjoy, we’re here to change your mind! We want everyone to experience the health benefits of Green Tea and show you that this can be an amazing, refreshing, and delicious drink when made correctly. With just a few tips on how to brew this powerful leaf we can change your mind about the taste and enjoyment of drinking Green Tea.

Download our Green Tea Science Brewing Technique Book to learn about 12 Scientific Tips for Brewing Green Tea to Taste Better.

Don’t miss out on the health benefits of tea!

  • Improve health
  • Increase brain function
  • Regulate weight
  • Lower your risk of cancers
  • Reduce risk of heart disease
  • Lowers risk of diabetes

We know that you will love this tips to brewing tea and getting the most flavor and elegance out of every cup.  Sign up for our newsletter and get this great informative manual on brewing green tea. You will learn what it is that makes it one of the most popular beverages in the world.

The E-Book also includes the chapter of Kei Nishida's book, "Art of Brewing Japanese Green Tea" where he teaches you how to brew hot and cold Japanese Green Tea.  

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Kei Nishida
Kei Nishida


Kei Nishida, PMP is a writer, a Japanese Green Tea enthusiast, and the founder and CEO of With two books behind him and more on the way, this entertaining author brings his passion for Green Tea wherever he goes.

His two books "I Will Teach YOU How to be healthy by Using Japanese Green Tea!: Surprising Facts and Tips for How You can Take Best Advantage of This Amazing Plant" and "Green Tea Mania : 250+ Green Tea Facts, Cooking and Brewing Tips & Trivia You (Probably) Didn't Know" are available in print and Kindle Book on Amazon.
These books and his blog Japanese Green Tea and Health provides health related tips and research findings focusing on green tea and its health benefit in variety of ways.

Kei’s love of Green Tea and passion for writing has helped make him a feature author on sites and Magazines such as Yoga Digest Magazine, T-Ching, Sexy Fit Vegan, and Woman’s Daily Magazine.

His enthusiasm for health and tea pushed him to developing his company,, where he brings the very best in Japanese Green Tea to customers all over the world.

Kei grew up in Japan and moved to USA at the age of 14, now living in Portland, Oregon. In his earlier carrier, he was Software Engineer at Hewlett Packard Inc. Kei takes advantage of being bi-lingual in Japanese and English, as well as his science background for his research and writing. Information you find in his books and blogs are a combination of the best content and research from Japan and all around the world.

Books By Kei Nishida

I will Teach You How to Be Healthy By Using Japanese Green Tea

Paperback: 112 pages
Language: English
ISBN-10: 1541252454
ISBN-13: 978-1541252455
Product Dimensions: 5.5 x 0.2 x 8.5 inches
Click Here to View Table of Contents and First 2 Chapters

Green Tea Mania : 250+ Green Tea Facts, Cooking and Brewing Tips & Trivia You (Probably) Didn't Know

Green Tea Mania : 250+ Green Tea Facts, Cooking and Brewing Tips & Trivia You (Probably) Didn't Know
Paperback: 120 pages
Language: English
ISBN-10: 1544093322
ISBN-13: 978-1544093321
Product Dimensions: 8.2 x 0.3 x 6 inches
Click Here to View Table of Contents and First 2 Chapters

Also in Japanese Green Tea and Health

Fresh Cup Magazine Features Kei Nishida's Article - June 2017
Fresh Cup Magazine Features Kei Nishida's Article - June 2017

by Kei Nishida

Fresh Cup Magazine June 2017 Issue featured Kei Nishida's Article. 

Article: The Whole Leaf, Green Tea Inspiration (Page 30) 

Fresh Cup Magazine is the leading coffee and tea magazine distributing more than 180,000 prints a year.

June 2017 issue was 25th year anniversary edition of the magazine.

View full article →

Fukamushi-Cha (Deep Steam)Green Tea - 5 Reasons Why They Taste Better Than Other Types of Japanese Green Tea
Fukamushi-Cha (Deep Steam)Green Tea - 5 Reasons Why They Taste Better Than Other Types of Japanese Green Tea

by Kei Nishida

Fukamushi Cha, or deep-steamed green tea, is a flavor revelation for green tea fans, and its bolder, sweeter, richer taste can win over those who haven’t yet found a green tea favorite. The very special taste of fukamushi green tea is made possible by steaming the freshly harvested young leaves nearly twice as long as in other green teas, before being rolled dry. 

What makes Fukamushi Green Tea taste so much better than other green teas? Here are five reasons that set it apart, contributing to its unique taste.

View full article →

Japanese Green Tea vs Chinese Green Tea - 10 battles you don't want to miss
Japanese Green Tea vs Chinese Green Tea - 10 battles you don't want to miss

by Kei Nishida

Chinese green tea and Japanese green tea both come from the same plant: Camellia Sinensis. However in many ways the similarities stop there. From when and how they're processed to the benefits they serve, Chinese green tea and Japanese green tea differ. Which one is "better" is the subject of this battle, comparing each on 10 ranging criteria.

View full article →

Steeping Guide

Steeping Guide - Hot

  1. Dissolve 2 teaspoon of powder into 8 Oz of hot water. We recommend about 175°F for most common green tea.

    Please note that our product page has different recommended temperature based on type of tea between 175°F- 185°F; however, 175°F can be the most common and standard temperature that would work for any type of our green tea.

    Steeping guide

  2. Wait for 60-120 seconds  (Please follow steeping guide on the product for specific time based on type of tea.)

  3. Use mesh strainer to filter out the green tea leave and serve hot

Steeping Guide - Cold

  1. Dissolve 3-4 teaspoon of powder into 30 Oz of cold water.  For best result, use filtered water, bottled water. Alternatively, you can boil water and let it cool down until room temperature. 

  2. Keep in refrigerator for 3 hours or more. Key point is to use longer time to dissolve. This way, sweetness increases, and it does not break down theanine and vitamin C.  For best result, let it sit for overnight. 

  3. Stair the water first, then use mesh strainer to filter out the green tea leave and serve cold.