The price tag in the pharmacy is falling. In the grocery aisle, the rules are tightening. The Trump administration wants Americans slimmer from both ends of the checkout line: make weight-loss drugs cheap—as low as $149 a month for some doses—while letting states bar soda and candy from SNAP. It’s the same problem attacked two ways—the shot, and the shopping cart—and it could be the start of a quiet revolution in how America tackles obesity. The populist pitch is simple: Deliver a headline