A year ago, plastic surgery practice Physician Body Solutions in Voorhees, Center City and Bala (877-433-5476, physicianbodysolutions.com) became a franchise of Dr. Robert Posner’s non-prescription serotonin-pill-based diet. The diet’s premise: Boost your mood, and you’ll crave (and eat) fewer carbs. Sounds crazy. Seems to have worked. About 200 PBS patients have completed the typically 12-week, medically supervised, $1,500 regime—most reporting a loss of 25 to 40 pounds. No stats, however, on the dieters’ gain in actual happiness.