Lifestyle diseases are health problems caused by changes in lifestyle that make breathing heavier and lower oxygen in the body. The driving force behind lifestyle diseases is cell hypoxia. Lifestyle diseases are caused by certain habits like poor diet, inactivity, and smoking as well as factors outside our control like age, gender and heredity. Common lifestyle diseases include heart disease, cancer, stroke and diabetes which have risk factors such as smoking, high blood pressure, high cholesterol, obesity, physical inactivity, diet, alcohol and lack of exercise.