Updated September 2019: According to the most recent Behavioral Risk Factor Surveillance System (BRFSS) data, West Virginia has the highest adult rate of diabetes at 16.2%. Nine of the 10 states with the highest type 2 diabetes rates are in the South. A record high number of Americans—40%, or more than 100 million adults—are living with diabetes or prediabetes according to the Centers for Disease Control and Prevention. Without significant changes, as many as 30% of people with prediabetes will go on to develop type 2 diabetes.