Obesity, autism, mental health problems, IBS, allergies, auto-immunity, cancer. Does the answer to the modern epidemic of ‘Western’ diseases lie in our gut?You are 10% human. For every one of your cells, there are nine impostors hitching a ride. You are not just flesh and bone, but also bacteria and fungi. And you are more ‘them’ than you are ‘you’.Your gut alone hosts 100 trillion of them and until recently we thought that our microbes didn’t matter. This is all set to change as the latest...