In a paper published in BMJ Open Diabetes Research & Care, researchers looked at the prevalence of type 1 diabetes in 118 countries and changes in life expectancy from 1950 to 2010. After applying a measure known as the Biological State Index to the data, they found that the rapid increase in type 1 diabetes over the last few decades was directly linked with increases in human life expectancy, especially in Western countries -- and therefore a reduction in natural selection. University of Adelaide. "Advances in medical care have led to type 1 diabetes boom." ScienceDaily. ScienceDaily, 5 May 2016. www.sciencedaily.com/releases/2016/05/160505104741.htm.