His stomach has been reduced in size to that of a 16-year old.
How might this affect the New York Jets?
They certainly won't get to hear anymore fat jokes, many of which Ryan makes up himself.
Coach Ryan has always made jokes about his weight, including comments after a photo of him shirtless, while changing into a Carolina Hurricanes jersey for a Florida-Carolina NHL game last month aired on television and made it's way around the Internet.
The defensive-minded head coach even went as far as to blame his weight on why the Atlanta Falcons didn't hire him after the 2007 season.
Sports heads from all around the country have poked fun at the rotund coach for his lack of control when it comes to eating.
They won't be laughing soon.
Weighing 340-pounds when he was hired by the Jets in January 2009, he has reportedly gained over 30 lbs. since.
According to a report by the New York Post, Ryan's average daily intake of 7,000 calories a day was the main culprit.
The coach is reported to be resting peacefully in his home in New Jersey.
Coach Ryan will have to consume a modified liquid diet for the next couple months while the body adjusts to the device, then he can resume eating regular meals.
A lap-band procedure is the insertion of a plastic band intended to wrap around the top of a larger stomach.
Once in place, it shrinks an enlarged stomach allowing less room for food and thus gives the user a feeling of being full.