How can one create a DIY isotonic solution?
A simple DIY isotonic solution can be made by mixing 600ml (20.3 fl oz) of water with 35g of sugar, a pinch of salt (0.5–1g NaCl), and a splash of lemon juice. This mixture approximates the 6% carbohydrate concentration found in commercial isotonic drinks, providing a cost-effective alternative.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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