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There's a common belief that to avoid being obese you just have to take more exercise and eat less. Well, Cambridge geneticist Dr Giles Yeo says that obesity is a much more complex condition, which is mostly related to the way some people just feel hungrier than others. He spoke to Â鶹Éç Newsday. (Picture: A man with a large belly eats junk food in Leipzig, Germany. Credit: Sean Gallup/Getty Images)