What Are The Proven Health Benefits Of Green Tea?

Written by:

Obi Obadike

Obi Obadike

Celebrity Fitness & Nutrition Expert, CFT, SFN, M.S. Founder & CEO – Ethical Inc.
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What are the proven health benefits of green tea? Green tea has a lot of antioxidant health benefits such as fat loss, lowering the risk of heart disease and improved brain function. One of the key ingredients in green tea is a stimulant and that stimulant will help keep you alert. It has less caffeine than coffee and it contains an amino acid L-theanine. Studies suggest that Amino acid L-theanine and caffeine works well together to help improve brain function.

What Are The Proven Health Benefits Of Green Tea? – Photo Credit: iStock-Chiociolla

Green Tea is an ingredient in most fat burner supplements because of its fat burning property effects. In one study of 10 men that took green tea shown a 4% increase in calorie burning. There was also another study in 12 men where they took green tea extract and their fat oxidation increased by 17%. There are also studies where physical performance increased by up to 12%.

Green Tea has antioxidants which protects against oxidative damage and helps to prevent chronic illnesses.

“Green tea has a lot of antioxidant health benefits such as fat loss, lowering the risk of heart disease and improved brain function.”- Celebrity Fitness & Nutrition Expert Obi Obadike

Studies on Green Tea

  • There have been several studies on the consumption of green tea reducing the risk of cancer. There were some observational studies where women who drank green tea had a 20 to 30% lower risk of developing brain cancer.
  • There was a study that showed that men who drank green tea had a lower risk of advanced prostate cancer. And there was an analysis of 29 studies, and it showed that the people who drank green tea had a 42% less likely risk to develop colorectal cancer.
  • These are all observational studies and more in-depth long-term studies needs to be done but it gives you some good insight though. If you don’t want to reduce the antioxidant effect of tea, then don’t add milk, and dilute it.
  • There are some studies that has shown that green tea can reduce the risk of cardiovascular disease by 31%. There are also studies that has shown it can reduce your bad cholesterol levels.
  • Have you ever heard that drinking green tea can help you live longer? Well, there was a study done on 40,530 Japanese adults for over 11 years. The study revealed that those who drink 5 cups of green tea or less were significantly less likely going to die during that 11-year study period.
  • Another study done in Japan involving over 14,000 Japanese people who drank green tea were 76% less likely going to die during that 6-year period. These studies have shown that people were more likely to live longer than those that didn’t.
  • Green Tea has also shown to reduce the risk of Type 2 Diabetes. Studies has shown that it will improve insulin sensitivity and reduce blood sugar levels. There was also study in Japan that showed that those who consume green tea had a 42% lower risk of Type 2 diabetes.

The Bottom Line is that green tea is one of the healthiest drinks you could ever have. And it has a lot of high antioxidants to help lower the risk of so many chronic diseases. You will never go wrong if this is a permanent staple in your regular daily lifestyle.

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  1. Kuriyama S, Shimazu T, Ohmori K, Kikuchi N, Nakaya N, Nishino Y, Tsubono Y, Tsuji I. Green tea consumption and mortality due to cardiovascular disease, cancer, and all causes in Japan: the Ohsaki study. JAMA. 2006 Sep 13;296(10):1255-65. doi: 10.1001/jama.296.10.1255. PMID: 16968850.
  2. Etsuji Suzuki, Takashi Yorifuji, Soshi Takao, Hirokazu Komatsu, Masumi Sugiyama, Toshiki Ohta, Kazuko Ishikawa-Takata, Hiroyuki Doi, Green Tea Consumption and Mortality among Japanese Elderly People: The Prospective Shizuoka Elderly Cohort, Annals of Epidemiology, Volume 19, Issue 10, 2009, Pages 732-739, ISSN 1047-2797,
  3. Shinichi Kuriyama, The Relation between Green Tea Consumption and Cardiovascular Disease as Evidenced by Epidemiological Studies, The Journal of Nutrition, Volume 138, Issue 8, August 2008, Pages 1548S–1553S,


4. Iso H, Date C, Wakai K, Fukui M, Tamakoshi A; JACC Study Group. The relationship between green- tea, and total caffeine intake and risk for self-reported type 2 diabetes among Japanese adults. Ann Intern Med. 2006 Apr 18;144(8):554-62. doi: 10.7326/0003-4819-144-8-200604180-00005. PMID: 16618952.

5. Ogunleye AA, Xue F, Michels KB. Green tea consumption and breast cancer risk or recurrence: a meta-analysis. Breast Cancer Res Treat. 2010 Jan;119(2):477-84. doi: 10.1007/s10549-009-0415-0. Epub 2009 May 13. PMID: 19437116.

6. Norie Kurahashi, Shizuka Sasazuki, Motoki Iwasaki, Manami Inoue, Shoichiro Tsugane for the JPHC Study Group, Green Tea Consumption and Prostate Cancer Risk in Japanese Men: A Prospective Study, American Journal of Epidemiology, Volume 167, Issue 1, 1 January 2008, Pages 71–

7. Chen Y, Wu Y, Du M, Chu H, Zhu L, Tong N, Zhang Z, Wang M, Gu D, Chen J. An inverse association between tea consumption and colorectal cancer risk. Oncotarget. 2017 Jun 6;8(23):37367-37376. doi: 10.18632/oncotarget.16959. PMID: 28454102; PMCID: PMC5514915.

8. Abdul G Dulloo, Claudette Duret, Dorothée Rohrer, Lucien Girardier, Nouri Mensi, Marc Fathi, Philippe Chantre, Jacques Vandermander, Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans, The American Journal of Clinical Nutrition, Volume 70, Issue 6, December 1999, Pages 1040–1045,

9. Michelle C Venables, Carl J Hulston, Hannah R Cox, Asker E Jeukendrup, Green tea extract ingestion, fat oxidation, and glucose tolerance in healthy humans, The American Journal of Clinical Nutrition, Volume 87, Issue 3, March 2008, Pages 778–784,

10. Doherty M, Smith PM. Effects of caffeine ingestion on exercise testing: a meta-analysis. Int J Sport Nutr Exerc Metab. 2004 Dec;14(6):626-46. doi: 10.1123/ijsn

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