Drinking a mix of glucose and fructose after exercise might help your stomach feel better and refill liver energy stores faster, and sometimes gives a big boost in endurance—but not always.
Claim Context
Consuming glucose-fructose mixtures (e.g., 2:1 ratio) at 1–1.2 g·kg⁻¹·h⁻¹ during recovery likely enhances gastrointestinal comfort and liver glycogen resynthesis compared to glucose alone, and may improve endurance capacity by up to 33% in some scenarios, though performance benefits are inconsistent across exercise types.
“Maunder et al. found that the maltodextrin–fructose combination increased subsequent endurance running capacity by ~33% over the maltodextrin–glucose mix, highlighting the potential of glucose–fructose to enhance endurance capacity.”
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Quantify the average performance benefit of glucose-fructose vs glucose across diverse recovery and exercise protocols.
A systematic review and meta-analysis of RCTs in endurance athletes (n > 400), comparing glucose-fructose (2:1) vs glucose-only at 1.2 g·kg⁻¹·h⁻¹ over 4–24 h recovery, with time-to-exhaustion or time-trial performance as primary outcomes.
Determine causal effects on both glycogen resynthesis and performance.
A double-blind RCT with 70 trained cyclists, randomized to glucose or glucose-fructose (2:1) at 1.2 g·kg⁻¹·h⁻¹ over 6 h post-exercise, with liver and muscle glycogen measured via MRS, and a 40-km time trial 24 h later.