Tragic story of world's heaviest woman

After years of gorging on burgers, French fries and chocolate chip cookies Renee Williams tipped the scales at 64 stone. She was just 29 years old.

The mother of two, who weighed almost half a ton, was bedridden and knew her only chance of survival was to beg doctors for a gastric bypass to reduce the size of her stomach.

Before her death she let cameras into her home in Austin, Texas, to raise awareness of the dangers of obesity.