Consumers could be wasting their money on sports drinks, protein shakes and high-end trainers, according to a new joint investigation by BBC Panorama and the British Medical Journal.
'Lack of evidence' that popular sports products work
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Dr Carl Heneghan of Kellogg College, University of Oxford, explains his findings.
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Podcasts from Kellogg College, one of Oxford University's largest and most international graduate colleges.
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