A new report from the Institute for Health Metrics and Evaluation estimates that by 2040, the US will break 64th in the world for life expectancy. The US ranked 43rd in 2016, the largest decline among high-income countries.
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According to the study recently published in The Lancet, Americans' average lifespan will increase, but only 1.1 years from 78.7 years (2016) to 79.8 years in 2040.  With an average lifespan of 82.9 in 2016, Japan ranks first in the world and is expected to fall into second place by 2040, with Spain receiving the highest award.
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Using data from the Global Burden of Disease study, researchers looked at a variety of factors that affect life expectancy. Of the 250 causes of death that were studied in 1
They value these problems Diabetes, chronic kidney disease, obesity and lung cancer will lead to a significant increase in deaths by 2040.
"The future of world health is not predetermined, and there is a wide range of plausible trajectories." Lead author Kyle Foreman said in a statement. "But whether we see significant progress or stagnation depends on how well or poorly health systems address key health determinants."
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Researchers concluded that "the overlap of targeted policies, technological innovation, and careful attention to rising environmental, social, and geopolitical risks is likely to shape the range of possible health care pathways in the future."
Last month, the Atlanta-based Center for Disease Control and Prevention also stated that overall life expectancy has fallen in the country, mainly due to the increasing deaths from overdose, chronic liver disease, suicide, Alzheimer's and bloodstream infections.
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The 10 countries with the highest expected average life expectancy for 2040, according to IHME:
- Spain (85.8 years)
- Japan (85.7 years)
- Singapore (85.4 years)  Switzerland (85.2 years)
- Portugal (84.5 years)
- Italy (84.5 years)
- Israel (84.4 years)
- France (84.3 years)  Luxembourg (84.1 years)
- Australia (84.1 years)
Read the full study on thelancet.com.