Lifestyle diseases are the diseases associated with the way a person or group of individuals lives. They include atherosclerosis, heart disease, stroke, obesity, type 2 diabetes, and smoking and alcohol and drug abuse conditions. They usually react to changes in one's lifestyle and somehow have some common property among them. One of such features is low oxygen in the body. Some of the lifestyle diseases known are heart disease, cancer, diabetes, obesity, arteriosclerosis, high blood pressure, swimmer's ear, stroke, chronic obstructive pulmonary disease, and nephritis. All the Best!