I didn’t think our relationship would last, but neither did I think it would end so soon.My patient had struggled with bipolar disorder his entire life, and his illness dominated our years together. He had, in a fit of hopelessness, tried to take his life with a fistful of pills. He had, in an episode of mania, driven his car into a tree. But the reason I now held his death certificate — his sister and mother in tears by his bed — was more pedestrian: a ruptured plaque in his coronary artery. A heart attack.Americans with depression, bipolar disorder or other serious mental illnesses die 15 to 30 years younger than those without mental illness — a disparity larger than for race, ethnicity, geography or socioeconomic status. It’s a gap, unlike many others, that has been growing, but it receives considerably less academic study or public attention. The extraordinary life expectancy gains of the past half-century have left these patients behind, with the result that Americans with serious mental illness live shorter lives than those in many of the world’s poorest countries.