What changed since 1776 to allow Americans' lifespan to double

Key Points:

• Average life expectancy in the U.S. has roughly doubled since 1776, increasing from around 35-40 years to about 79 years today, largely due to reductions in infant mortality and infectious diseases.
• Key factors contributing to increased longevity include advances in sanitation, clean water, vaccination, antibiotics, and medical care, as well as improved treatments for chronic diseases such as heart disease, cancer, and diabetes.
• Public health milestones such as the development of municipal water systems, acceptance of germ theory, food safety regulations, and the introduction of vaccines and antibiotics significantly boosted life expectancy throughout the 19th and 20th centuries.
• Recent declines in life expectancy have been linked to drug overdoses, suicides, alcohol-related deaths, and the COVID-19 pandemic, though life expectancy has begun to recover since 2021.
• Current challenges to further increasing lifespan include rising obesity rates, especially in children, and an increase in certain cancers among younger adults, emphasizing a shift from surviving infectious diseases to managing chronic health conditions and promoting healthier lifestyles.