This document discusses lifestyle diseases. It defines lifestyle diseases as those linked to one's lifestyle and includes non-communicable diseases caused by lack of physical activity, unhealthy eating, alcohol, substance abuse and smoking. The most common lifestyle diseases are heart disease, stroke, obesity, type 2 diabetes and lung cancer. It provides examples of other lifestyle diseases and discusses the risk factors, which include modifiable behavioral factors like smoking and diet, non-modifiable genetic factors, and metabolic factors that can increase blood pressure, obesity, blood glucose and lipids.