Lifestyle related diseases are caused by both controllable and uncontrollable risk factors and result from unhealthy behaviors. The document discusses major lifestyle diseases like cardiovascular diseases, diabetes, and depression. Cardiovascular diseases are caused by factors like smoking, alcohol, poor diet, and lack of exercise. Diabetes occurs when the body does not properly use or produce insulin and can be prevented by maintaining a healthy weight and lifestyle. Depression is characterized by feelings of sadness and lack of motivation and can be prevented through healthy eating, exercise, meditation, sleep, social interaction, and avoiding a sedentary lifestyle.