FiberNEW2026-08

Human gut microbiome as a composite health biomarker.

Braun Tzipi, Harounian Orli, Hadar Rotem, Ziv Arnona et al. — Gut microbes

Summary

This study found that a "gut health index" is strongly connected to our diet, lifestyle, and overall well-being. It suggests that the health of our gut microbes can reflect and even influence various aspects of our health, from heart fitness to inflammation. Eating more fiber and fewer ultra-processed foods appears to improve this index.

AI-generated summary — read the original

Key points

A healthy gut microbiome is linked to better overall health and lifestyle choices.
Higher fiber intake and lower consumption of ultra-processed foods are associated with a healthier gut.
The gut microbiome health index reflects factors like cardiac fitness and inflammation.
Dietary changes can quickly influence the health of your gut microbes.

What the study looked at

Researchers wanted to understand how a specific measure of gut microbiome health, called a "gut microbial health index," relates to people's diet, lifestyle, and overall health status. The study involved nearly 900 adults who underwent comprehensive medical check-ups. Scientists collected extensive data on their eating habits, daily activities, clinical test results, heart fitness, and the composition of their gut microbes. The study revealed a strong connection between the gut health index and various health markers. A healthier gut index was linked to higher fiber intake, better heart fitness, and a greater sense of well-being. Conversely, it was negatively associated with consuming ultra-processed foods and markers of inflammation. The findings suggest that our gut microbiome can serve as an important indicator of our overall health, and that dietary changes can quickly impact its health.

Dietary takeaway

This research highlights the importance of dietary choices for a healthy gut and overall well-being. To support your gut microbiome, aim to increase your intake of fiber-rich foods like fruits, vegetables, and whole grains, while reducing ultra-processed foods. Remember, this is one study, and while it adds to our understanding, more research is always needed to draw definitive conclusions.

Abstract

Using a cohort of 893 adults who underwent medical check-ups with rich data collection across diet, lifestyle, clinical labs, cardiac stress testing, and microbiome profiling, we show that a gut microbial health index (MHI), originally defined using a large meta-analysis of various human disease cohorts, is also substantially associated with lifestyle and diet. This association persists across the overall cohort, disease-free subsets, and individuals with common medical conditions such as hypertension and dyslipidemia. The gut MHI was positively correlated with factors such as variation in cardiac stress test fitness, fiber intake, and well-being, and negatively correlated with exposure to ultra-processed foods and markers of subclinical inflammation (WBC and CRP mostly within normal limits). Lipidomics profiling of a subcohort revealed that triglycerides correlate positively with ultraprocessed foods, and negatively with unsaturated fats, olive oil, and nuts, linking diet, MHI, and lipid profile. Estimating the contribution of modifiable dietary and lifestyle factors to the MHI uncovers actionable ways to improve or worsen the personal MHI. Analyses of previously published intervention studies showed that the MHI responds quickly to dietary changes, within the predicted range. Our findings emphasize the potential of using microbiomes, and specifically the MHI, as a reporter of overall health.

View on PubMed →DOI: 10.1080/19490976.2026.2719055