What is wrong with American society?

I was saddened to hear about a recent report published in the Journal of American Medical Association (JAMA) that life expectancy in the U.S. is declining and has been on a downward trend for three years. Perhaps more disturbing is the fact that the group experiencing the largest decline is from the ages of 25–34 years. These figures are shocking for several reasons, not least because the United States has the highest per capita health care spending in the world. Moreover, this downward trend is going in the opposite direction of America’s peer nations, which continue to experience rising life expectancy. These worrying facts have me asking, what’s wrong with America and why are midlife adults dying in what should be the prime of their lives?