Dr. Ed Livingston is chief of gastrointestinal surgery at the University of Texas Southwestern Medical School.

NPR: Weight-Loss Surgery: It's Not for Everyone

"If you're male, you're going to have to go through the rectum, " said Dr. Sayeed Ikramuddin, director of gastrointestinal surgery at the University of Minnesota Medical School.

CNN: Use of natural openings may ease weight-loss surgery