Acknowledgements

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Figure 2 Department of Health, 2011. Reproduced under the terms of the OGL, www.nationalarchives.gov.uk/doc/open-government-licence

Figure 3 © shironosov / iStock / Getty Images Plus

Figure 5 http://www.glycemicindex.com/about.php

Figure 6 Jeukendrup, A. (2014). 'A step towards personalized sports nutrition: carbohydrate intake during exercise'. Sports Medicine, 44(1). Adis International Ltd

Figure 7 © comotion_design / iStock / Getty Images

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