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The food you eat is turned into glycerol by your liver, which becomes glucose in your bloodstream – body fuel in its purest form. “This is absorbed by our cells providing the energy they need,” says Sanders.

Energy boost

A sports drink with 6-8% glucose gives an ideal instant energy surge. High5, Boots Isotonic and Lucozade Sport all deliver the requisite hit. “If you can’t lay your hands on a sports drink, jelly babies and even white bread with jam will do,” says Ruth McKean, dietician at the Scottish Institute of Sport.