An estimated 350 million people have diabetes worldwide, according to a new study published in the Lancet.
Researchers from Harvard School of Public Health collaborated with experts in London to determine the number of people who have diabetes.
They looked at the fasting glucose levels of over two million adults.
They found the number of people with diabetes went from 153 million in 1980 to 347 million in 2008. Cases went up 18 percent in men and 23 percent in women.
Researchers say an overall increase in weight contributed to the spike in cases -- as well as genetic factors and an aging population.
Cholesterol and blood pressure levels have actually dropped in many parts of the world -- a sharp contrast to diabetes.