Calories consumed minus calories burned: it’s the simple formula for weight loss or gain. But dieters often find that it doesn’t work. Cynthia Graber and Nicola Twilley of Gastropod investigate.
Written by Cynthia Graber, read by Charlotte Hussey, produced by Graihagh Jackson.
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If you liked this story, we recommend The fat city that declared war on obesity, by Ian Birrell, also available as a podcast.