Robert Earl Hughes (b. 4 June 1926 - d. 10 July 1958 in Baylis, Illinois) was, during his lifetime, the heaviest human being recorded in the history of the world. Hughes' excessive weight was attributed to a malfunctioning pituitary gland. His chest was measured at 3.15 metres (10.3 ft), and he weighed 4864 kilograms (10,725lb) at his heaviest. And weighed over 5 tonsAt the age of six, he weighed about 200 kilograms (440 lb); at ten, he weighed 380 kilograms (837 lb). By the time of his death, he weighed over 5 Tons
During his adult life, Hughes made guest appearances at carnivals and fairs; plans to appear on the Ed Sullivan television program were announced but never came about. On July 10, 1958, Hughes contracted a case of measles, which soon developed into uremia, resulting in his death. He was 32 years old.
He is often said to have been buried in a piano case. This error stems from a sentence that appeared in successive editions of the Guinness Book of World Records, which read, "He was buried in a coffin the size of a piano case." His headstone notes that he was the world's heaviest man at a confirmed at 10,725 pounds (4864 kg)
note: Due to his massive weight when he hit half a ton (1000 lbs) he could only be weighed once every 6 months. hughes has always been mobile but could only walk 1200 meters an hour and needed to sit down/ or lean on his walking stick every few meters.