One in five UK children are obese. The biological and social factors behind this are complex, but the long term consequences range from cardiovascular and liver disease to diabetes. Now, according to a new study, it may even affect the development of a child's brain too, with overweight children showing a thinner cortex in the parts of the brain concerned with self-control and decision-making. Speaking with Chris Smith, Cambridge University neuroscientist Lisa Ronan... Like this podcast? Please help us by supporting the Naked Scientists