Half Ton Mum is the story of the world’s heaviest woman. Texas resident Renee Williams weighs 896 pounds at the young age of 29. As a mother of two, she’s been told for years that she’s too heavy for a potentially life-saving gastric bypass, but now, finally, a pioneering doctor has agreed to operate. The operation is her last chance but it carries a high risk. Either she will be on the way to losing 700 pounds, or she’ll die.