By Kate Kelland LONDON (Reuters) – Scientists in Britain have found a new link between the diversity of bacteria in human poo – the human faecal microbiome – and levels of harmful types of body fat. In research that may help explain why excessive weight problems and obesity tend to run in families, the scientists said high levels of visceral fat – which is linked to risks of chronic disease – were linked to having a relatively small range of bacteria in faeces. People with a high diversity of bacteria in their faeces had lower levels of visceral fat, according to the study published on Monday in the journal Genome Biology.