Jane Wardle on food

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Why do some people always reach for that extra chocolate
biscuit, while others seem to have no problem holding back?
Professor Jane Wardle, a health psychologist at UCL, is
investigating factors that determine our food choices and what they
mean for our future health. She talks to the Wellcome Trust's
Daniel Glaser about why overeating is not the simple matter
of willpower you might think it is.