Should obese teens have gastric bypass surgery?

That was the focus of Monday’s “Oprah.”

The talk show queen interviewed a Houston family and their doctor.

Nathaniel Williams, 18, used to weigh 340 pounds.  Then he had gastric bypass surgery at Texas Children’s Hospital last month.

Dr. Nancy Brandt, the director of the Bariatric Surgery program at the hospital, performed the surgery.

She said Williams should lose 30 pounds in the first month after the operation.