Traditional diets shape unique gut microbes of Indian tribes
Subject: Science & Technology
Context & Background
A landmark study published in the journal Gut Microbes has revealed that the gut microbiomes of eight Indian tribal communities possess distinct microbial diversity, tightly bound to their traditional diets, cultural practices, and geography. The study covered communities including the Warli, Madia, Gond, Kabui, Brokpa, Purigpa, Balti, and Boto populations, shedding light on the intricate co-evolution of human biology and micro-organisms.
Key Findings of the Study
1. Diet-Driven Microbial Diversity
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Dietary Variation: Tribal diets vary substantially based on regional ecosystems—ranging from grains, dairy, fish, fruits, and wild greens to stems and home-brewed beverages.
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Trans-Himalayan Specifics: Trans-Himalayan groups (such as the Brokpa, Purigpa, Balti, and Boto) primarily consume grain- and dairy-rich diets. This long-term consumption has exerted evolutionary selection pressure, resulting in:
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High overall gut-microbial diversity.
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A distinct strain of Bifidobacterium adolescentis.
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Enhanced genetic pathways for lactose and galactose metabolism, alongside enzymes capable of breaking down plant-derived complex carbohydrates.
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The Role of SCFAs: Gut bacteria like Bifidobacterium ferment dietary carbohydrates to produce Short-Chain Fatty Acids (SCFAs), which play critical roles in human metabolic and immune health. However, researchers caution that Bifidobacterium should not be viewed as a universal biomarker for health, as diverse dietary patterns favor different beneficial microbial ecosystems.
2. The Industrialisation Divide
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Comparisons with Western cohorts (such as from California) highlight stark contrasts, proving that industrialisation drastically alters microbial structures.
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The findings demonstrate how the interplay of human culture, geography, genetics, and long-term traditional diets shapes a rich, diverse microbial landscape that is rapidly vanishing in urbanised settings.
The Broader Context: India’s Representation in Global Science
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The Data Gap: Historically, Indian populations have been severely underrepresented in global human-microbiome databases, accounting for less than 1% of available global human microbiome samples.
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Conservation Imperative: Modernisation, urban migration, and nutritional transitions threaten to erode this indigenous microbial heritage. Researchers emphasize the urgent need to preserve these strains in biobanks for future biomedical research and therapeutic drug development.
The Indian Human Microbiome Initiative (IHMI)
To bridge this massive scientific gap, India launched a dedicated national framework:
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Institutional Backing: A flagship multi-institutional program of the Department of Biotechnology (DBT), led and coordinated by the National Centre for Cell Science (NCCS), Pune.
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Timeline: Conceptualised around 2017 (with early development by scientists Yogesh Shouche and Shekhar Mande), the formal DBT project received sanction in March 2020.
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Scope & Targets: Aimed to map population-specific microbiomes across 17 communities (10 endogamous and 7 tribal), covering bacteria, fungi, archaea, and micro-eukaryotes.
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Current Status: The initiative has successfully completed the microbiome profiling of all 3,400 targeted individuals and sequenced 657 whole metagenomes, generating one of the world’s most comprehensive datasets on healthy Indian gut microbiomes.
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Major Deliverables: Identification of community-specific microbial signatures, five distinct Indian gut enterotypes, novel microbial taxa, and the preservation of over 180 anaerobic bacterial strains, paving the way for precision probiotics and microbiome-based therapies.
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