Distinct microbial signatures found across South Asian populations
New Delhi: A comprehensive study of healthy adults across India and Sri Lanka has found that the gut microbiome of South Asians bears distinctive, locally shaped signatures — a discovery that researchers say should prompt region-specific approaches to nutrition, diagnostics and precision healthcare.
The research, reported in Gut Microbes, analysed stool samples and accompanying dietary, lifestyle and health information from 575 healthy adults drawn from 10 culturally and geographically distinct communities across India and Sri Lanka. The investigators compared microbial patterns across differing environments and levels of urbanisation to understand how local factors influence the gut ecosystem.
The study concluded that gut-microbiome profiles in South Asian populations do not simply mirror patterns previously documented in European and North American cohorts. Instead, the microbial communities appear to be shaped by a combination of diet, culture, geography and the dynamics of changing lifestyles, the researchers reported.
Implications for lifestyle-related disease prevention and treatment
The findings carry potential consequences for how common cardiometabolic conditions — notably obesity and diabetes — are prevented and treated in the region. Scientists and clinicians have long known that the trillions of microorganisms in the human gut are influenced by diet, physical activity and environment; this study strengthens the argument that those influences differ in South Asia in ways that matter for health interventions.
Because many microbiome discoveries have been made predominantly in European and North American populations, the authors say applying those insights universally may be inappropriate. The new baseline assessment for healthy South Asian adults bolsters the case for developing:
- region-specific microbiome diagnostics;
- personalised nutrition strategies tailored to local diets and cultural practices;
- precision healthcare approaches that account for geographically shaped microbial patterns.
South Asia is home to nearly a quarter of the world’s population and is experiencing rapid urbanisation. At the same time, rates of obesity, diabetes and other cardiometabolic disorders are rising across the region — trends that make locally relevant microbiome research especially urgent, the report said.
Study design and scope
The multi-community study gathered biological samples along with detailed information on participants’ diet, lifestyle and health status. By sampling populations that represent differing environments — from more rural locales to urban settings — researchers could examine how urbanisation and related factors correlate with gut microbial composition.
| Item | Detail |
|---|---|
| Participants | 575 healthy adults |
| Geography | 10 distinct communities across India and Sri Lanka |
| Journal | Gut Microbes |
By providing one of the most extensive baseline assessments of the healthy South Asian gut microbiome to date, the study offers a resource for future research into how microbial variation links with disease risk and treatment response in the region.
What this means for clinicians and consumers
For clinicians, the results signal caution when extrapolating diagnostic thresholds or treatment algorithms developed elsewhere. For individuals and families, the research reinforces the importance of culturally sensitive dietary guidance and public-health strategies that reflect local foods, habits and environmental contexts.
Researchers emphasised that further work is needed to translate microbial signatures into actionable clinical tools. Longitudinal studies, larger cohorts and interventions that modify diet or lifestyle will be required to determine causality and to design effective, locally appropriate prevention and treatment programmes.
As South Asian nations continue to urbanise and lifestyles evolve, understanding the local microbiome may become an important piece of the puzzle in addressing the region’s rising burden of lifestyle-related diseases.
