Health, Wealth, and Welfare
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy (narrative historical review/expert commentary, not clinical CEBM)
OpenAlex W2161147280 · doi:10.5089/9781451953411.022.a006
What was done
This is a narrative historical review and economic commentary examining global trends in life expectancy and their relationship to economic growth over the past 150 years, synthesizing historical and demographic perspectives on the drivers of mortality decline.
What was found
Between the 16th century and the mid-19th century, average global life expectancy fluctuated below 40 years without an upward trend. Life spans increased gradually in the late 19th century—linked to rising incomes, sanitation, and food availability—and accelerated markedly in the 20th century due to technological and medical advances such as the germ theory of disease. The abstract notes that HIV/AIDS has undermined progress in Africa and elsewhere. No quantitative effect sizes or precise economic return estimates are reported in the abstract.
Why it matters
It provides a broad historical synthesis of how public health improvements and economic development reinforce one another, shifting from income-driven to technology-driven longevity gains.
Limits
This is a narrative overview and commentary rather than an empirical or systematic study. No primary datasets, statistical analyses, or quantitative estimates are presented in the abstract.
Cited by
- supports Human life expectancy and longevity increased reliably following the acceptance of germ theory in the 19th century.