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Page last updated at 07:48 GMT, Monday, 11 January 2010

Why is willpower so weak?

According to neuroscientists, having a lack of willpower isn't a character flaw, it could all be down to the physical make-up of the brain.

US science writer Jonah Lehrer explains an experiment by a psychologist at Stanford University which shows "just how weak your willpower muscles are".

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