Chipotle Mexican Grill Inc (CMG.N), known for its indulgent burritos, is battling a “Chubby Chipotle” ad campaign from the food industry group whose “Nanny” ads helped sink New York City’s ban on super-sized sugary drinks. The Center for Consumer Freedom’s full-page advertisement in Thursday’s New York Post depicts a smiling, shirtless, overweight young man flexing one arm and resting the other on his ample tummy.