The coronary artery disease is the most common form of heart disease among Indians. Approximately 80 per cent of those who have heart problems suffer from this form of disease. "The reason of its prevalence is deposition of fats in arteries. A person should always maintain his or her health by taking proper diet, avoiding fats, regular exercise and de-stressing. A brisk walk of 45 minutes at least five days a week is really helpful in maintaining the health," said Dr Naresh Trehan, executive director and chief cardiac department, Apollo Hospital. People suffering from high blood pressure and diabetes especially tobacco taking in any form causes serious threats for the disease. The prevalence of coronary artery disease in urban India is about to double compared to the rate in rural India and about four times higher than in the U.S. This highlights the fact that the intake of nutritional foods in urban population is lacking. The rates appear to be higher in South India with Kerala having a prevalence of 13 per cent in urban areas and 7 per cent in rural areas. The coronary artery disease rates in urban India are similar to those among the generally more affluent overseas Indians. For example, the prevalence of CAD in New Delhi is 10 per cent and in Chennai 11 per cent. Overall, there has been a three fold increase from 3% prevalence 30 years ago in urban India. Higher rates of CAD in urban India compared to rural India suggest important roles for nutritional and environmental factors, or nurture. There is a significantly higher body mass index (BMI) in urban India compared to rural India. There is also a higher rate of abdominal obesity among the urban population, with urban men having a waist to hip ratio (WHR) of 0.99 compared to 0.95 among rural men. This increase in BMI and WHR results in significant dyslipidemia and insulin resistance and a three times increase in diabetes. The prevalence of CAD risk factors in north India between rural and urban populations.