The campaigning US cardiologist once chose medicine over political activism, writes Jeanne Lenzer, now he works to combine them

Earlier this year the Boston cardiologist Vikas Saini, along with journalist Shannon Brownlee, led an international team of 27 co-authors to publish a series of articles for the Lancet about the global scourges of undertreatment and overtreatment. The series comprised a call to action against the physical, psychological, and social harms to…