Life-long friends Faye and Laura are baffled by their weight gain. Eating well and working out down at the gym, they can't understand why they're having no slimming success.
They agree to be put under 24-hour surveillance in the hope of finding out if their diets reveal any clues to their puzzle.
The cameras are also in use down at a London food market to see what people eat when they think no one is watching, and neuropsychologist Dr David Lewis, examines if lack of sleep makes you eat higher calorie treats the next day.
Secret Eaters, C4,
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