10/28/2026
5 signs you are underfuelling your IRONMAN training.
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1. Your long sessions fall apart in the second half even though you are fit. That fade is often a fuel problem rather than a fitness problem.
2. You are starving and irritable in the evenings. Under-eating during the day tends to show up later as hunger and poor food choices.
3. You keep picking up colds and small niggles. Low energy availability can affect how well your body recovers and adapts.
4. Your sleep is worse even though you are training hard. Going to bed under-fuelled can make it harder to sleep well.
5. Your performance stalls while your training load goes up. Under-eating often looks like a fitness problem. Eating during sessions over 90 minutes is a good starting point.
Do you eat during every session over 90 minutes?