The adoption of a westernized gut microbiome in Indian Immigrants and Indo-Canadians is associated with dietary acculturationOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This cross-sectional study examined how westernization affects the gut microbiome by comparing Indians living in India, Indo-Immigrants, and Indo-Canadians against Euro-Canadian and Euro-Immigrant controls. Stool samples underwent 16S rRNA and shotgun sequencing to characterize microbial taxa and functional gene profiles. Dietary and demographic data were also collected to evaluate lifestyle patterns alongside the microbiome data.
Who was studied?
The study population consisted of Indians residing in India, Indo-Immigrants, and Indo-Canadians, compared against Euro-Canadian and Euro-Immigrant control groups. The abstract does not report specific sample sizes or detailed demographic breakdowns for these groups. The comparison design was built around migration status and country of residence rather than clinical diagnosis.
What were the most important findings?
Indians and Indo-Immigrants harbored gut microbiotas distinct from Euro-Canadian and Euro-Immigrant controls, marked by high abundances of Prevotella species and carbohydrate-active enzymes (CAZymes) reflecting a diet rich in complex carbohydrates. Indo-Canadians showed a transitional microbiome profile that moved toward the westernized pattern seen in controls. This shift paralleled increasing dietary acculturation among Indo-Canadians rather than a fixed, heritable microbial signature.
What are the greatest implications of this study?
Because 44% of Canadians are first- or second-generation immigrants, and westernized dietary practices are spreading globally, microbiome transitions like this one may be widespread and consequential. Since Indian immigration to westernized countries has surged and post-migration IBD risk rises accordingly, this dietary-driven microbiome shift may help explain that increased disease susceptibility. The authors call for future research into the health implications of such microbiome transitions in immigrant populations and in newly industrialized nations.