You are not alone! Your body is home to a whole host of bacteria that live in and on you: your microbiome. You might be slightly repulsed by this idea, but these tiny organisms are really important for our health. There is now growing evidence that our microbes at risk from our modern lifestyles? Comparing samples of human bowel bugs from America with remote populations in Papua New Guinea, a research team have identified significant differences between the two microbiomes, and what's more, they think they know why. Georgia Mills spoke to Jens Walter from the University of Alberta.