Who you live with has a major impact on your gut health
People sharing a household develop overlapping gut and oral microbiomes, regardless of dietary differences. Studies show housemates share up to 26% of oral microbes, while couples converge at 44%. Transmission extends to microbes linked to diabetes. The effect persists even when diets vary widely.
What changed
New research confirms cohabitation drives microbiome convergence beyond oral bacteria, including gut microbes, and highlights transmission of diabetes-linked strains.
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Living with others reshapes gut and oral microbes—even with different diets
confidence 94%People sharing a household develop overlapping gut and oral microbiomes, regardless of dietary differences. Studies show housemates share up to 26% of oral microbes, while couples converge at 44%. Transmission extends to microbes linked to diabetes. The effect persists even when diets vary widely.
What's confirmed:
- People who live together share approximately 25% of their gut and oral microbiota, according to multiple studies.
- Housemates share 26% of their oral microbes, regardless of dietary differences.
- Couples share 44% of their oral microbiota, indicating closer microbial overlap than housemates.
- Cohabitation drives transmission of microbes linked to diabetes, suggesting shared living environments influence disease-related microbial communities.
- Social contacts throughout life introduce microbes that can influence health and disease risk.
- Shared microbiomes in households occur even when individuals maintain different diets.
Still unconfirmed:
- Researchers traced the 26% oral microbe overlap in housemates to daily interactions, though the exact mechanisms remain under study.