Scientists at the University of East Anglia (UEA) have found that living with housemates, partners, or family can lead to the exchange of gut bacteria through daily interactions like hugging, kissing, and sharing food preparation spaces. Research on Seychelles warblers on Cousin Island provided clear evidence that social closeness, rather than just shared environments, drives the transmission of gut microbes, particularly anaerobic bacteria crucial for digestion and immunity. This suggests that intimate interactions and shared living spaces in human homes may subtly influence our gut microbiomes, potentially strengthening immunity and improving digestive health for household members. The study, published in Molecular Ecology, analyzed fecal samples to compare the gut bacteria of birds that interacted closely.