Lifestyle diseases are caused partly by unhealthy behaviors and habits that people have control over, such as smoking, diet, exercise, and sleep habits, as well as other uncontrollable factors. The document discusses cardiovascular diseases, cancer, and diabetes as examples of lifestyle diseases. It provides information on the causes and symptoms of cardiovascular diseases, ways to detect and treat them, as well as steps people can take to prevent cardiovascular diseases and other lifestyle diseases through diet, exercise, avoiding smoking and managing stress levels.