Chances are that if you’re overweight, you’re carrying around more than just the extra pounds — the feelings of guilt and hopelessness often associated with being out of shape can be crippling. People often dread going to the doctor for fear of being scolded. But what if the doctor himself is fighting the same battle? Dr. Jonathan Pierce, a Grass Valley physician, found himself in exactly that position. “I had put on a lot of pounds during my residency, and they just never came off,” he said. “Obviously I knew it wasn’t healthy — I had to do something.” After …