Three American men have taken the unusual step of moving to China in an extreme attempt to shed huge amounts of weight at a fat reduction clinic and have become surprise local celebrities.

Alonzo Bland, 33, and brothers Walt and David Anderson, 56 and 50, have lived in the northern Chinese city of Tianjin since the middle of this year as part of an effort to break away from their unhealthy lifestyles back home.

Together, they have lost a combined 192 kilogrammes (427 pounds) and are aiming to shed over 100 more.

"The reason why I think it works here is that China is away from everything, all the stuff that I'm familiar with," said Alonzo, who has lost 103 kilogrammes from the 291 kilos he weighed when he first arrived in Tianjin.

He decided to come after winning a contest organised by China Connection, a US firm promoting traditional Chinese medicine, and was being treated free of charge for as long as it took to lose his target weight like Walt and David.

Alonzo, who had a tracheotomy in 2000 because the fat in his face was pressing down on his windpipe, left a fiancee and two children behind in Wisconsin.

For David, an unmarried dishwasher in a casino in Iowa who sold his car and ditched his job to come to China, the move was a life-saver.

"Before I came over, it got to the point that I couldn't walk 20 feet without gasping for breath," said David, who is down to 104 kilogrammes after losing 41 kilos.