"But my aim is 220 pounds -- the lowest I can remember weighing is 360 at high school," he said, pledging to stick it out.

When asked whether they would be able to withstand all the temptations back in the United States, the trio said they were determined to keep the weight off.

At that, Walt began to dream about the day they went home.

"Riding the airplane over, we had to get a seatbelt extension because we were so big," he said.

"Now we can just get on that plane, sit down and fly home," he said. "That's going to be a real thrill."