The Social Microbiome Of Older People

Aging Theory
Lever
Social relationships and isolation can influence the composition of the gut microbiome in older individuals, potentially impacting their health and contributing to age-related frailty.
Author

Gemini

Published

January 12, 2026

Our bodies are home to trillions of microorganisms, particularly in our gut, collectively known as the gut microbiome. This community of bacteria plays a crucial role in our overall health, influencing everything from our immune system to our metabolism. As we age, the balance of these gut microbes can shift, and an imbalance, often called dysbiosis, has been linked to various age-related health issues, including chronic inflammation and a decline in physical resilience, known as frailty.

Intriguingly, recent insights suggest that our social lives might also play a significant role in shaping this internal microbial world. The concept of a “social microbiome” proposes that interactions with others, and even with animals, can lead to the exchange of beneficial bacteria, enriching the diversity of our gut microbiome.

Conversely, a lack of social connections, such as social isolation or loneliness, which can be common among older adults, might negatively impact the gut microbiome. This impoverishment of social relationships could contribute to an unfavorable shift in gut bacteria, potentially exacerbating age-related health problems.

Therefore, fostering social engagement and even considering activities like pet therapy could be more than just good for mental well-being; they might also be a way to support a healthier gut microbiome in older individuals, potentially helping to counteract the biological processes associated with aging and frailty.


Source: link to paper