What Was One Of the Most Important Advances in Health of the 20th Century?

                                

"What was the number one most important advance in health according to one of the most famous medical figures of the 20th century? The discovery that “Many of the major and commonest diseases in modern Western culture are universally rare in third-world communities, were uncommon even in the United States until after World War l” yet are now common in anyone following the Western lifestyle. So it’s not genetics—they’re lifestyle diseases (See Dr. Burkitt’s F-Word Diet). This means they must potentially be preventable."

Don’t Forget Fiber. NutritionFacts.org. Dr. Michael Greger M.D. February 19, 2015. http://nutritionfacts.org/2015/02/19/dont-forget-fiber/