Substrate Digest
Issue 01: Two sugars beat one, even on an empty tank
14:23
A double blind crossover trial found a 2:1 glucose to fructose blend oxidized more of the carbohydrate athletes actually swallowed, whether they were fully fueled or two days into an energy deficit. Elsewhere this week, carb loading research turned out to be mostly unblinded, and at the IRONMAN Worlds it was logistics and nerves, not knowledge, that broke women's fueling plans.
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