Lifestyle diseases (also sometimes called diseases of longevity or diseases of civilization interchangeably) are defined as diseases linked with the way people live their life. This is commonly caused by alcohol, drug and smoking abuse as well as lack of physical activity and unhealthy eating. Diseases that impact on our lifestyle are heart disease, stroke, obesity and type II diabetes. The diseases that appear to increase in frequency as countries become more industrialized and people live longer. They can include Alzheimer's disease, arthritis, atherosclerosis, asthma, cancer, chronic liver disease or cirrhosis, chronic obstructive pulmonary disease, type 2 diabetes, heart disease, metabolic syndrome, chronic renal failure, osteoporosis, stroke, depression, and obesity. In the U.K the death rate is four times higher from respiratory disease caused by an unhealthy lifestyle
Some commenters maintain a distinction between diseases of longevity and diseases of civilization. Certain diseases, such as diabetes, dental caries and asthma, appear at greater rates in young populations living in the "western" way; their increased incidence is not related to age, so the terms cannot accurately be used interchangeably for all diseases.