Donna Simpson, the 42-year-old woman from New Jersey, U.S, who already weighs 43st, but she is determined to nearly double her size to become the world’s fattest woman. She want to reach the 1,000lb mark (71st) in just two years. Ms Simpson already holds the Guinness World Record as the world’s fattest mother, when she gave birth in 2007 weighing 38stone.