"Middle-aged, non-Hispanic white Americans saw a 'marked increase' in mortality between 1999 and 2013, a reversal from a decades-long decline that can be largely explained by a spike in suicide, substance abuse and liver disease, new research shows.... The change in overall mortality was driven by those with a high-school degree or less, the study found ... Those with a bachelor's degree or higher saw death rates fall -- though they too posted an increase in mortality from suicide and drug and alcohol poisonings."