A man who weighed about half a ton when he was admitted to a hospital was recovering Wednesday from obesity surgery.

Patrick Deuel, 42, underwent the procedure to reduce the size of his stomach four months after being admitted to the hospital at 1,072 pounds.

He had been bedridden since last fall and was malnourished because so many of his calories came from foods high in fat and carbohydrates.

Deuel had difficulty breathing and suffered from high blood pressure and diabetes linked to obesity that his doctor said were killing him.

Gastric bypass surgery was thought to be his best chance for permanent weight loss, but doctors said Deuel needed to lose some weight first, to gain enough strength so he could walk on his own and prove he was healthy enough to survive the surgery.

Before going into surgery on Tuesday, Deuel had lost 421 pounds. He said his diabetes and high-blood pressure were under control and credited the results to a 1,200-calorie-a-day diet and exercise.

Caregivers and others are starting to take notice of the changes, he said.

“Every time I move they don’t look at me like, ‘My God, he is going to fall down or something,’ ” Deuel told Sioux Falls TV station KELO in an interview before the surgery.

Last month, Deuel took his first steps with the help of nurses and two walkers for support. More recently, he has been walking up stairs and even swimming at the hospital’s pool.

Gastric bypass is the most common obesity surgery in the United States. The operation involves creating a pouch in the upper stomach and attaching it to a section of intestine, reducing the amount of food patients can eat.

Deuel, a former restaurant manager from Valentine, Neb., is just under 6 feet tall and has always fought his weight. He weighed about 90 pounds in kindergarten and more than 250 pounds in middle school.