Added the following paragraph:
Obesity Has Risen Dramatically While Diabetes Rates Have NotThe rate of obesity has grown alarmingly over the past decades, especially in certain regions of the U.S. The NIH reports that "From 1960-2 to 2005-6, the prevalence of obesity increased from 13.4 to 35.1 percent in U.S. adults age 20 to 74.7." If obesity was causing diabetes, you'd exect to see a similar rise in the diabetes rate. But this has not happened.
The CDC reports that "From 1980 through 2010, the crude prevalence of diagnosed diabetes increased ...from 2.5% to 6.9%." However, if you look at the graph that accompanies this statement, you see that the rate of diabetes diagnoses rose only gradually through this period--to about 3.5% until it suddenly sped upward in the late 1990s. This sudden increase largely due to the fact that in 1998 the American Diabetes Association changed the criteria by which diabetes was to be diagnosed, lowering the fasting blood sugar level used to diagnose diabetes from 141 mg/dl to 126 mg/dl. (Details HERE)
Analyzing these statistics, it becomes clear that though roughtly 65 million more Americans became fat over this period, only 13 million more Americans became diabetic. And to further confuse the matter, several factors other than the rise in obesity and the ADA's lowering of the diagnostic cutoff also came into play during this period which also raised the rate of diabetes diagnoses:
Diabetes becomes more common as people age as the pancreas like other organs, becames less efficient. In 1950 only 12% of the U.S. population was over 65. By 2010 40% was, and of those 40%, 19% were over 75.(Details HERE.)
At the same time, the period during which the rate of diabetes rose was also the period in which doctors began to heavily prescribe statins, a class of drugs we now know raises the risk of developing diabetes. (Details HERE.)