WHY THIS HAPPENS
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Glycogen depletion — 400-500g of stored carbohydrate exhausted without replacement
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Starting fuelling too late — waiting until hungry means glycogen is critically low
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Under-dosing carbs — 30g/hour when the ride demands 60-90g/hour
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Pre-ride nutrition gap — skipping breakfast or riding fasted without adjusting intensity
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Pacing too hard early — burning glycogen at threshold when the ride demands endurance pace
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Heat and dehydration amplifying glycogen use rate