Critically comment on the lifestyle diseases and their impact on human health.

Pattern and mechanisms

Cardiovascular disease, type-2 diabetes, obesity, chronic respiratory disease and several cancers dominate the category. Energy-dense diets, tobacco, sedentary work, air pollution, hypertension and metabolic dysregulation interact with age and genetic susceptibility. Abdel Omran’s epidemiological transition describes the population shift from infectious mortality toward chronic and degenerative disease, but many low- and middle-income populations face both simultaneously.

Evolutionary accounts propose mismatch between earlier environments and rapid urban-industrial change. James Neel’s “thrifty genotype” was influential but is neither a proven single genotype nor an adequate explanation of population differences. David Barker’s developmental-origins hypothesis is better supported: fetal and early-life undernutrition can alter later cardiometabolic risk. Biology therefore carries a life history.

Anthropological critique

• Nutrition transition: Barry Popkin describes shifts toward processed foods, fats and sugars alongside declining activity.
• Ethnographic change: Turkana moving from pastoral settings to towns experienced altered diet, activity and stress; such cases show transition, not a timeless ethnic predisposition.
• Political economy: Cheap ultra-processed food, unsafe walking space, long work hours, advertising and unequal preventive care structure behaviour. Tobacco or diabetes cannot be reduced to willpower.
• Syndemics: Merrill Singer’s concept explains mutually reinforcing disease under inequality—for example diabetes with tuberculosis, depression or food insecurity.

In India, urbanisation and changing work coexist with persistent anaemia, undernutrition and infection. A low-birth-weight child may later encounter caloric abundance: the “double burden” can occur in one household. Tribal and migrant populations may face market displacement from traditional diets without gaining reliable care.

Impact

Chronic disease produces premature mortality, disability, renal and vascular complications, catastrophic household spending and long-term care burdens. Gendered caregiving and late diagnosis magnify effects. Prevention must combine tobacco control, food and urban policy, primary screening and culturally intelligible care—not only advice to exercise.