Has our nation's top doctor, Surgeon General Vivek H. Murthy, turned into a spin doctor? His latest public health initiative, the Step It Up campaign to promote walking, is so misleading that it's got me wondering whose health he's protecting: the American people's or the food and beverage industry's? The Step It Up campaign is alarmingly similar to Coca Cola's Coming Together campaign, which enlisted scientists with impressive-sounding credentials to promote the idea that the root cause of our obesity epidemic is not over-consumption of sugary beverages and processed foods, but rather a lack of exercise. This is just flat-out false.