Molecular characterisation of fructose transport in equine small intestine.

Summary

# Molecular characterisation of fructose transport in equine small intestine Fructose has gained traction as an alternative carbohydrate supplement for endurance horses because it produces a more stable blood glucose profile than glucose—with lower insulin spikes and reduced fluctuation risk during exercise—potentially helping athletes avoid hypoglycaemia-related fatigue. Fernandez-Castaño and colleagues investigated the molecular mechanisms underlying fructose absorption in the equine small intestine, characterising the specific transporters responsible for moving this sugar across the intestinal epithelium. Their molecular analysis identified key fructose transport proteins in equine enterocytes, providing mechanistic insight into how effectively horses can actually utilise fructose supplementation at the absorption level. These findings matter considerably for nutritional strategy in endurance work, confirming that the intestinal capacity exists to absorb fructose efficiently, which supports the physiological rationale for its use as a performance supplement. Practitioners recommending fructose-based feeds during competition now have evidence that the intestinal machinery is equipped to handle this substrate, though individual variation in transporter expression and practical feeding protocols warrant further investigation.

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Key Findings

• •Fructose transport mechanisms in equine small intestine were molecularly characterised
• •Fructose ingestion produces lower insulin peaks compared to glucose
• •Fructose causes less marked blood glucose fluctuations during exercise
• •Fructose supplementation may prevent hypoglycaemia-induced exhaustion in endurance horses

Conditions Studied