None of my patients has ever lost 650 lb (295 kg), but I’ve no doubt that skin that has been stretched out for decades doesn’t spring back into place.
NYT has an interesting article on it:
“It has been more than six years since Paul Mason, who once weighed 980 pounds and could not move from his bed, pulled himself back to life with gastric bypass surgery and his own strength of will. But he still carries his past with him.
On Wednesday, Mr. Mason, who is 55 and now lives in rural Athol, Mass., took another important step in a process that has been long and uneven, marked by small triumphs and unexpected setbacks. He had the second of two surgeries to eliminate the excess skin that enveloped his body like a shroud. Fifty pounds of it was removed from his abdomen last year; this time, about 10 pounds’ worth was excised from his arms and hip in a multihour operation in Manhattan.”
Source: Hundreds of Pounds Lighter, and Now Shedding Another Burden of the Past – The New York Times