Lifestyle modification involves altering long-term habits, such as eating or physical activity, and maintaining the new behavior for months or years. With increasing prevalence of lifestyle diseases in India, one out of four Indians is at risk of dying from non-communicable diseases like diabetes or cancer before age 70. The document discusses various unhealthy lifestyle habits like an unhealthy diet, smoking, alcohol and drug consumption, and lack of physical activity, and the health problems associated with each. It provides tips on lifestyle modification such as maintaining a balanced diet, avoiding smoking, alcohol and drugs, including physical activity, and getting regular sleep.