Most notably, the overall death rate for Americans increased because mortality from heart disease and stroke increased after declining for years. Deaths were also up from Alzheimer's disease, respiratory disease, kidney disease and diabetes. More Americans also died from unintentional injuries and suicide. In all, the decline was driven by increases in deaths from eight of the top 10 leading causes of death in the U.S.
"When you see increases in so many of the leading causes of death, it's difficult to pinpoint one particular cause as the culprit," Anderson says.
The obesity epidemic could be playing a role in the increase in deaths from heart disease, strokes, diabetes and possibly Alzheimer's. It could also be that doctors have reached the limit of what they can do to fight heart disease with current treatments.
The epidemic of prescription opioid painkillers and heroin abuse is probably fueling the increase in unintentional injuries, Arun Hendi, a demographer at Duke University, wrote in an email. The rise in drug abuse and suicide could be due to economic factors causing despair.