 Pfeiffer's in Sioux Falls, serving the region for over 75 years. Become a Pfeiffer for life. Go to pfeiffersonline.com. Hi, this is Greg Delfridge for Sioux Falls Secret for Weight Loss. I love sharing news about Dr. Ben's unique program for losing weight because it works. I've lost 40 pounds and inches off my waist by following the Sioux Falls Secret for Weight Loss plan.