Dr. Charlie Seltzer MD is board certified in Obesity Medicine AND certified by the American College of Sports Medicine as a Clinical Exercise Specialist. \n\nBut what REALLY matters is that he used to be obese himself...and now he isn't. Practical knowledge from a Philly doc who's walked the walk.\n\nhttp://zdoggmd.com/against-medical-advice-038\nLearn more about your ad choices. Visit megaphone.fm/adchoices