Michigan found that the number of people living with diabetes globally more than quadrupled since 1980, when there were around 108 million people living with the condition.
They also found that the disease is no longer the preserve of wealthier countries with access to rich, unhealthy food - with 80 percent of diabetes suffers now living in low and middle-income countries.
The study, published in medical journal The Lancet did, not offer a theory as to why diabetes cases are rocketing, or why poorer countries have been so badly hit.
But health experts have previously blamed a combination of large-scale movement of people from the countryside to live in cities, unhealthy diets, and sedentary lifestyles.
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