Diabetes mellitus in the developing countries has increased dramatically in the last decade. High prevalence of Type 2 diabetes mellitus is common. It is primarily because of increases in the prevalence of sedentary lifestyle and obesity. Despite all the advances in early detection and treatment, health education remains the cornerstone of diabetes management. People with diabetes, unlike those with many other medical problems, can't just take pills or insulin in the morning, and then forget about their health the rest of the day. Differences in dietary intake, exercise levels, healthy lifestyle, managing stress and other factors may all affect blood sugar levels. So the more people with diabetes learn how these risk factors affect them, the better control they will be able to achieve. It is imperative to understand the epidemiology of diabetes mellitus so as to develop strategies for the effective policy making, planning and implementation of an efficient prevention and control programme at local, state and National level.