‘Do you need medicine?’
The 15th time is about "Suppression of atopy and hay fever by green tea".That the "health benefits of green tea", has written a special edition. The 15th time is about "Suppression of atopy and hay fever by green tea".
- Prevention of cancer
- Immune power up
- Lose weight
- Decrease in cholesterol level
- Improve memory and learning ability
- Prevention and bactericidal action of food poisoning
- Caries prevention
- Prevention of halitosis
- The effect of preventing drowsiness
- Suppress the possibility of functional disorder
- Adult disease prevention
- Help the gastrointestinal work
- Prevention of arteriosclerosis and stroke, prevention of blood
- High blood pressure (hypertension)
- Suppression of atopic and pollinosis
- Anti-influenza action
- Effect on AIDS
- Hangover prevention
- Stress relief
The relationship between green tea and health is drawing attention and new research results are reported one after another. In addition, we may add efficacy. We would like to deeply describe each relationship.
The Benefits of Green Tea: "Suppressing Hay Fever and Atopic Dermatitis"
Many effects of green tea have been known for a long time, but this time we will introduce the effects of suppressing the symptoms of pollinosis / allergic rhinitis and atopic dermatitis.
Effects on hay fever and allergic rhinitis
Humans have a mechanism called immunity that recognizes and eliminates foreign substances (bacteria, viruses, etc.) outside the body. In hay fever, immunity reacts excessively to a foreign substance called pollen, causing allergic symptoms such as runny nose, sneezing, and stuffy nose. In order to improve the symptoms of pollinosis, it is necessary to suppress the production of IgE antibody against pollen and the release of histamine.
Studies have shown that ingestion of catechins contained in green tea suppresses the release of histamine and alleviates the symptoms of perennial allergic rhinitis (* 1). Among the catechins, in a study in which the green tea "Benifuuki" containing a large amount of methylated catechins was drunk for 12 weeks, sneezing, runny nose, and itchy eyes were found in both cedar pollinosis and perennial allergic rhinitis compared to green tea without methylated catechins. It is reported that it showed a high improvement effect on (* 2).
In addition, in a study in which green tea "Benifuji" containing a large amount of methylated catechins was drunk for 52 days, the amount of IgE antibody and histamine in the blood increased in patients with Japanese cedar pollinosis compared to green tea containing no methylated catechins. It was found to have a suppressive effect and an effect of improving itchy eyes, stuffy nose, and sore throat (* 3).
In addition, strictinin contained in tea leaves has the effect of suppressing allergic symptoms by suppressing antibody production (* 4). And it is known that saponin has an action of inhibiting hyaluronidase involved in histamine release in type I allergy (* 5).
Effect on atopic dermatitis
Similar to allergic rhinitis, atopic dermatitis is caused by the production of IgE antibodies to various allergens, which release chemical transmitters such as histamine and cytokines, resulting in inflammation.
As for the effect of green tea on atopic dermatitis, there is a study in which a cream (tea cream) containing extracts of "benifuki" green tea, which contains high levels of methylated catechins, was applied. Compared to the control group, the group that applied the tea cream showed a higher rate of improvement in the intensity and extent of the skin rash and itching, and a greater rate of reduction in the amount of topical steroids (*6).
In addition, in a study in which catechins contained in green tea were made into tablets and taken for one month, it was reported that more than half of the patients with atopic dermatitis showed improvement in their symptoms (*7).
Green tea contains various ingredients that can be expected to have the effect of suppressing the symptoms of pollinosis and atopic dermatitis. People who want to reduce their symptoms in particular should be conscious of taking green tea that contains a lot of methylated catechins.
1) Tsutomu Okubo, et al .: Food and Immune Function Effect of Green Tea Catechin on Immune System-Focusing on Test Results of Perennial Nasal Allergy-, FOOD Style. 2005, 9 (1): p50-53.
2) Masuda S, et al. “Benifuuki” green tea containing O-methylated catechin reduces symptoms of Japanese cedarpollinosis: a randomized, double-blind, placebo-controlled trial. Allergology lnternational 2014; 63 (2): p211-217.
3) Mari Yamamoto, et al .: Effect of administration of methylated catechin-containing green tea "Benifuji" on Japanese cedar pollinosis, Health and Nutrition Food Research. 2004, 7: p15-30.
4) Tachibana R, et al. Identification of an Inhibitor for Interleukin 4-Induced ε Germline Transcription and Antigen-Specific IgE Production in Vivo Biochem Biophys Res Commun 2001; 280 (1): p53-60.
5) Yuko Susaka, et al .: Antibacterial and anti-inflammatory effects of tea leaf saponins, Journal of Pharmacy. 1996, 116 (3): p238-243.
6) Takao Fujisawa, et al .: Efficacy and safety of methylated catechin-containing tea extract cream for atopic dermatitis, Journal of Japanese Society of Allergology. 2007, 21 (4): p566.
7) Yutaka Nozaki, et al .: Effect of taking catechin tablets on atopic dermatitis-First report, Japan Society for Complementary and Alternative Medicine Academic Meeting Program / Abstracts. 2006, 9: p77.