What factors contributed to the transition from infectious diseases to chronic diseases as leading health concerns?

• A. Sanitation, mass production of food, immunizations, awareness and education
• B. Increased smoking only
• C. More antibiotic resistance
• D. Decreased life expectancy

Answer: (A)

The main idea here is the epidemiologic transition: as public health and living conditions improve, deaths from infectious diseases fall, and chronic, non-communicable diseases rise to become the leading health concerns, especially as people live longer.

Sanitation dramatically reduces transmission of pathogens, lowering infectious-disease mortality. Mass production of food improves nutrition and overall health, which strengthens resilience against infections and supports longer lifespans. Immunizations prevent many infectious diseases and their complications, further cutting infectious-disease deaths. Awareness and education empower people to adopt preventive health behaviors and seek care earlier, amplifying these gains.

Together, these factors reduce the burden of infections and support longer life, which allows chronic conditions like heart disease, cancer, and diabetes to emerge as the more prominent health issues.

The other options don’t capture this broad shift. Increased smoking contributes to chronic disease but doesn’t explain the large decline in infectious diseases; antibiotic resistance worsens infections but doesn’t explain the transition to chronic diseases as the dominant concerns; decreased life expectancy would not align with the pattern of chronic diseases becoming more prominent.