Traditional Diets Forge Distinct Gut Microbe Profiles Across India's Tribal Populations
Research published in Gut Microbiomes reveals how the ancestral eating habits of eight Indian tribes foster unique microbial diversity. Scientists emphasize the need for biobanking these rare bacterial strains before industrialization alters indigenous gut health forever.
Key takeaways
- Traditional Indian tribal diets create gut microbiomes that are distinctly different from industrialized Western populations.
- Trans-Himalayan tribes possess a unique strain of Bifidobacterium adolescentis linked to long-term dairy and grain consumption.
- The study identified 14 potentially new bacterial taxa, highlighting the untapped biological diversity in indigenous communities.
- Researchers warn that indigenous microbial diversity is at risk and must be preserved in biobanks for future medical use.
Why It Matters
Indigenous populations are significantly under-represented in global health data, accounting for less than 1% of human microbiome samples currently studied. This research establishes a critical baseline for India’s tribal communities, demonstrating that universal probiotic standards may not apply to non-Western populations. The discovery of potential new bacterial taxa suggests that traditional lifestyles harbor biological assets that are essential for future clinical applications and corrective health measures.
Key Facts
- The study examined 76 healthy adults from eight tribes, including the Warli, Gond, Madia, Kabui, and four trans-Himalayan groups (Brokpa, Purigpa, Balti, and Boto).
- Trans-Himalayan diets centered on grains and dairy resulted in a distinct prevalence of Bifidobacterium adolescentis.
- Tribes in other regions consumed diets rich in fish, fruits, stems, and home-brewed alcohol, leading to entirely different microbial signatures.
- The investigation identified 14 putatively novel bacterial taxa from the small sample size of 76 participants.
- Researchers found that these tribal microbiomes are fundamentally different from industrialized samples, such as those analyzed in California.
Background
A collaborative team from the National Centre for Cell Science (NCCS) in Pune, alongside international experts, conducted the analysis to understand how geography and culture influence internal biology. Dhiraj Dhotre, a lead scientist at NCCS, noted that the Indian microbiome exhibits enormous internal diversity compared to Western populations, driven primarily by long-term dietary habits. For instance, the trans-Himalayan groups showed enriched pathways for metabolizing lactose and galactose, a direct result of evolutionary selection pressure from high dairy consumption. Biological anthropologist Shantanu Ozarkar highlighted that human biological evolution and cultural traits like dairy consumption work in tandem to shape this microbial variety.
What Happens Next
The findings have catalyzed the Indian Human Microbiome Initiative, which aims to expand the research to over 3,400 individuals across 17 distinct communities. Independent experts like Mojibur Khan argue that future studies must continue to map core microbiomes based on specific agroclimatic zones and regional weather patterns. Furthermore, researchers are calling for the immediate establishment of biobanks to preserve these ancient microbes. As lead co-author Abhijit Kulkarni warned, this microbial biodiversity is at risk of disappearing within decades, making its preservation a high priority for future medical science.
Source: The Hindu — Sci-Tech
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