‘The Revelation Was That I Was the Problem’
Genetically, Xand and Chris van Tulleken are clones. Yet the 42-year-old twins do not look identical, because Xand is more than 30 pounds heavier than Chris. That is the biggest weight difference recorded in the long-running twin study at King’s College London.The van Tullekens live in London. They argue about food—specifically, how much Xand eats—all the time. They are also both medical doctors, and they present British television shows on health and diet.





























