Great article found on the BBC news website
http://www.bbc.co.uk/news/health-32543176
Our modern lifestyle is often blamed for the explosion in conditions like asthma, diabetes and obesity - but the evidence that our predecessors didn't suffer such ailments has been hard to come by - until now.
In 2008 a military helicopter chanced upon a previously uncharted group of huts in the remote Amazonas region in southern Venezuela, home to 15,000 Yanomami people.
Thought to have been completely isolated since their ancestors arrived in South America after the last ice age, the semi-nomadic hunter-gatherers have never been exposed to modern civilisation - therefore neither have their guts.
http://www.bbc.co.uk/news/health-32543176