An ICMR-India Diabetes (ICMR-INDIAB) study reported a sharp rise in diabetes and prediabetes in Tamil Nadu, with diabetes prevalence among those above 20 rising from 11.1% (2008-2010) to 22.7% (2022-2023), a 104% increase. India has about 101 million people with diabetes and 136 million with prediabetes; Tamil Nadu alone has about 12 million people with diabetes.