Rosalie Bradford (USA) (b. 27 August 1943) is claimed to have registered a peak weight of 544 kg (1,200 lb or 85 st) in January 1987.
Rosalie passed away on 29 November 2006.
In August of 1987, she developed congestive heart failure and was rushed to hospital. She was consequently put on a carefully controlled diet and by February 1994 weighed 128 kg (283 lb or 20 st 3 lb). Her target weight is 68 kg (150 lb or 10 st 10 lb).
Comments below may relate to previous holders of this record.