Survey Reveals: 'Immune Aging' Felt from the 30s. Experts Recommend 'Rejuvenating Bacteria' Butyrate-Producing Bacteria as a Countermeasure
Unlog Inc. announced the results of a survey on 'immune aging,' revealing that approximately 70% of respondents feel a decline in immunity, starting from their 30s. Experts recommend butyrate-producing bacteria as a countermeasure.
📋 Article Processing Timeline
- 📰 Published: April 9, 2026 at 19:00
- 🔍 Collected: April 9, 2026 at 10:30
- 🤖 AI Analyzed: April 20, 2026 at 10:40 (264h 9m after Collected)
Unlog Inc., which operates "Unlog," Japan's largest bowel movement and gut health support app, conducted a "Survey on Immunity and Aging Awareness" targeting 950 men and women in their 20s to 40s nationwide. This was done under the supervision of Professor Yuji Naito, a leading authority in intestinal bacteriology research, Professor of the Department of Bio-Immune Nutrition, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, and Specially Appointed Professor of Gastroenterology. The aim was to deepen the correct understanding of "immune aging," which accelerates from the 30s, and to propose efficient health management.
This survey, with Professor Yuji Naito's commentary, highlights the reality of "immune aging," which represents a decline in immunity, and the "health management fatigue" that modern people fall into.
Through the results of this survey, Unlog will promote the value of "butyrate-producing bacteria (rakusankin)" which supports immune condition by regulating bowel movements, and will support next-generation health habits that consumers can continue effortlessly.
## [Background of Implementation]
In recent years, with increasing health awareness, the number of consumers actively engaged in daily health management, led by gut health activities, has grown. In this survey, over 60% of respondents answered that they have "high awareness" of their own health management. On the other hand, over 60% also reported feeling "fatigued" by daily health management, revealing a situation where they are lost in a sea of health information, unable to find suitable countermeasures.
The "Survey on Immunity and Aging Awareness" conducted this time revealed that approximately 90% of respondents feel changes in their physical condition with age, and about 70% feel that their "immunity has declined compared to when they were younger." Furthermore, the 30s were most frequently cited as the period when immune aging begins, indicating that people are facing a decline in internal immunity along with visible changes such as skin.
However, only 30% of people were aware of the term "immune aging," suggesting that few people correctly understand and can address the cause of their discomfort as "immune aging."
Therefore, what is currently attracting attention among experts as a countermeasure against immune aging is the presence of "butyrate-producing bacteria (rakusankin)" which improves the gut environment.
However, many people cited "Vitamin C" and "lactic acid bacteria" as ingredients expected to be effective for immune aging countermeasures, while only 20% answered "butyrate-producing bacteria." It was found that despite the high attention to butyrate-producing bacteria, its key role in immune aging countermeasures is not yet widely known.
In response to this "health management fatigue" and "lack of knowledge about immune aging," Professor Yuji Naito, an expert in gut environment research, points out that for consumers to efficiently and effectively respond to immune aging, "it is essential to improve the gut environment and make butyrate-producing bacteria, which produce butyric acid involved in immune balance, an ally."
We are announcing the results of this survey, along with Professor Naito's commentary, as an opportunity for consumers to recognize their own "immune aging" and discover new health habits.
## [Survey Summary]
- Approximately 90% feel changes in physical condition and appearance, and 72.1% are aware of "immune decline."
It was revealed that 89.3% feel changes with aging, and specifically 72.1% feel a decline in "immunity."
- The 30s are the gateway to "immune aging." Changes in appearance and
This survey, with Professor Yuji Naito's commentary, highlights the reality of "immune aging," which represents a decline in immunity, and the "health management fatigue" that modern people fall into.
Through the results of this survey, Unlog will promote the value of "butyrate-producing bacteria (rakusankin)" which supports immune condition by regulating bowel movements, and will support next-generation health habits that consumers can continue effortlessly.
## [Background of Implementation]
In recent years, with increasing health awareness, the number of consumers actively engaged in daily health management, led by gut health activities, has grown. In this survey, over 60% of respondents answered that they have "high awareness" of their own health management. On the other hand, over 60% also reported feeling "fatigued" by daily health management, revealing a situation where they are lost in a sea of health information, unable to find suitable countermeasures.
The "Survey on Immunity and Aging Awareness" conducted this time revealed that approximately 90% of respondents feel changes in their physical condition with age, and about 70% feel that their "immunity has declined compared to when they were younger." Furthermore, the 30s were most frequently cited as the period when immune aging begins, indicating that people are facing a decline in internal immunity along with visible changes such as skin.
However, only 30% of people were aware of the term "immune aging," suggesting that few people correctly understand and can address the cause of their discomfort as "immune aging."
Therefore, what is currently attracting attention among experts as a countermeasure against immune aging is the presence of "butyrate-producing bacteria (rakusankin)" which improves the gut environment.
However, many people cited "Vitamin C" and "lactic acid bacteria" as ingredients expected to be effective for immune aging countermeasures, while only 20% answered "butyrate-producing bacteria." It was found that despite the high attention to butyrate-producing bacteria, its key role in immune aging countermeasures is not yet widely known.
In response to this "health management fatigue" and "lack of knowledge about immune aging," Professor Yuji Naito, an expert in gut environment research, points out that for consumers to efficiently and effectively respond to immune aging, "it is essential to improve the gut environment and make butyrate-producing bacteria, which produce butyric acid involved in immune balance, an ally."
We are announcing the results of this survey, along with Professor Naito's commentary, as an opportunity for consumers to recognize their own "immune aging" and discover new health habits.
## [Survey Summary]
- Approximately 90% feel changes in physical condition and appearance, and 72.1% are aware of "immune decline."
It was revealed that 89.3% feel changes with aging, and specifically 72.1% feel a decline in "immunity."
- The 30s are the gateway to "immune aging." Changes in appearance and