Jeff Leach has been leading the charge on what our microbiome means for our health and wellbeing. He’s the co-founder of the American Gut Project and one of those involved in the TV3 series, The Good Sh*t, which has followed the fortunes of four overweight young women trialling a new therapy to help lose weight. They have been taking capsules that contain bacteria from the faecal matter of fit and healthy people, carefully chosen by scientists. The trial relates directly to the latest research and uncovering the science of the human microbiome. Jeff talks about what the microbiome does and whether that science could hold the secret to tackling the obesity epidemic.