Glucose uses SGLT1 transporters; fructose uses GLUT5. Combining them allows total intake to exceed the ~60g/hour ceiling of glucose alone. The 1:0.8 ratio (previously 2:1) reflects Prof. Asker Jeukendrup's research showing this ratio delivers the highest oxidation rate without GI distress. Modern sports-nutrition products like Maurten, SIS Beta Fuel, and Precision Hydration use this ratio. Amateurs should gut-train up to the levels they plan to use in racing.
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