Household Interactions May Shape Your Gut Microbes, Study Finds

A study of Seychelles warblers on Cousin Island finds that closer social interaction correlates with more similar anaerobic gut bacteria, suggesting that close contact can transfer gut microbes beyond shared environments. The researchers tracked individuals with colored leg rings and collected fecal samples over years, noting that breeding pairs and helpers shared more anaerobic bacteria that thrive only inside the host. The findings may reflect what happens in human households, where daily interactions like hugging, sharing spaces, or preparing food could subtly shape our gut microbiomes, particularly for anaerobic bacteria important for digestion and immunity.