Nutrition: Green tea improves the intestinal flora and protects against food allergies

Nutrition: Green tea improves the intestinal flora and protects against food allergies

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Effects of green tea consumption

Can drinking green tea help people deal better with food allergies? To answer this question, the effects of green tea consumption on the abundance of bacteria in the intestine were examined. Drinking green tea has been found to increase the frequency of so-called FP bacteria. Again, this appears to protect against food allergies.

A recent study by Shinshu University in Japan found that green tea appears to protect against food allergies. The results of the study were published in the English language journal "Frontiers in Immunology".

How does green tea affect the intestinal flora?

Current research suggests that certain gut microbes can cause allergic immune reactions. The study examined how green tea affects the abundance of Flavonifractor plautii (FP) bacteria found in the intestine.

Flavonifractor plautii bacteria are part of the catechin metabolism

FP are part of the so-called catechin metabolism in the intestine. Catechin is an antioxidant found in a variety of foods including green tea. 30 to 42 percent of the dry weight of green tea is made up of catechins.

FP bacteria suppress the immune response to food allergies

The research group found that oral FP administration strongly suppressed the Th2 immune response to food allergies. The food we eat affects the complex cocktail of different bacterial strains in the intestine. What exactly does the consumption of green tea have?

Green tea increases the frequency of flavonifractor plautii

Drinking green tea increases the frequency of flavonifractor plautii, which in turn suppresses the Th2 immune response. FP is a bacterial strain from the clostridial family that is known to affect the immune system and, in particular, to inhibit inflammation. Some strains of clostridia may lower blood pressure. These are abundant in thin and not overweight people. This is why the researchers also suspect that these bacteria can be used to regulate weight.

The special food culture of Nagano Prefecture

Shinshu University, which is involved in the study, is located in Nagano Prefecture, which is known throughout Japan for the large number of fermented foods that have positive health effects. Nagano is unusual in that it has no direct access to an ocean. The food culture developed here is therefore unique. Due to the mountainous terrain, the people living there had to survive for a long time in winter without access to the outside world and maintain a rich eating culture with foods like miso.

Nagano people are particularly old

Nowadays, people living in the region are shown to have the best health and life expectancy in Japan. This suggests that people in Nagano have some of the best health in the world. Nagano has one of the lowest medical costs for elderly people in Japan, which means that people live longer there, but are also healthier.

More research is needed

Researchers are now continuing to scientifically research unique foods and metabolic processes in the body that occur in Nagano and Japan. Lessons learned could be shared with the rest of the world so that other countries could also benefit from the positive effects of this culture's food. (as)

Author and source information

This text corresponds to the requirements of the medical literature, medical guidelines and current studies and has been checked by medical doctors.


  • Tasuku Ogita, Yoshinari Yamamoto, Ayane Mikami, Suguru Shigemori, Takashi Sato et al .: Oral Administration of Flavonifractor plautii Strongly Suppresses Th2 Immune Responses in Mice, in Frontiers in Immunology (Published February 28, 2020), Frontiers in Immunology

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