This 1977 study “The Questionable Contribution of Medical Measures to the Decline of Mortality in the United States in the Twentieth Century,” by John B. McKinlay and Sonja M. McKinlay of Boston University, analyzed U.S. mortality trends from 1900–1973 and found that the vast majority of the increase in life expectancy occurred before most modern medical treatments or vaccines were introduced. They concluded that medical interventions accounted for only a few percentage points (like 3%!!) of the

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