Defining a Healthy Gut Microbiome: new Research identifies Key Bacterial markers

Italian researchers have published a first-of-its-kind portrait outlining what constitutes a healthy gut microbiome – specifically, the bacterial composition reliably linked to low inflammation, a healthy immune system, and healthy cholesterol levels.

Professor Frédéric Raymond, a specialist in the intestinal microbiome at Laval University’s Faculty of Agricultural and Food Sciences, commented that this study addresses a fundamental question in microbiome research: are changes in bacterial populations associated with health or disease, or do they simply exist alongside them?

“The authors of the study identified biomarkers of a healthy microbiota, and biomarkers of a microbiota that would be less healthy,” explains Raymond.

When we talk about microbiota, we will see in certain cases certain bacteria which are statistically associated with people who have a lower waist circumference, certain bacteria associated with people who have a higher waist circumference… But after that, we always ask ourselves questions like, what does all that mean?

A team from the University of Trento analyzed data from 34,500 individuals participating in the PREDICT program, run by microbiome analysis firm Zoe, in the United States and the United Kingdom.

The researchers focused on the 661 bacterial species present in over 20% of participants, identifying the 50 most strongly associated with good health (measured by markers like blood sugar and body mass index) and the 50 most strongly linked to health problems.

Notably, 22 of the 50 bacterial species associated with good health had not been previously identified. These species appeared particularly relevant to four key areas: cholesterol levels,immune and inflammatory health,fat distribution,and blood sugar control. Furthermore,little is currently known about 24 of the remaining 28 species.

Conversely,44 of the 50 bacterial species linked to poorer health were already known and previously associated with negative health effects.

Individuals considered healthy,with no known medical conditions,had approximately 3.6 times more “good” bacteria than others. healthy-weight participants had roughly 5.2 times more of these beneficial bacteria compared to those with obesity.

The study revealed that most bacteria correlated with either a healthy diet and better health outcomes, or a poorer diet and poorer health. However, 65 of the 661 bacteria studied didn’t fit neatly into this pattern, suggesting the reality is incredibly complex.