Ultramarathon Nutrition: A Food-First Plan for Long Race Days
An ultra is not a marathon with more gels. Duration changes appetite, texture tolerance, sleep and logistics.
Successful plans use repeatable carbohydrate early, broader food options later and enough flexibility to respond without abandoning the numbers.
Updated 25 August 2026. This is general sports nutrition information, not individual medical advice.
build a minimum repeatable intake
The ISSN ultra position stand describes 30–50g carbohydrate and 150–400kcal per hour as practical racing ranges, with individual variation and higher needs in some athletes. Start from what you can repeat, then train it.
Use gels for countable carbohydrate and add familiar food for calories, salt and flavour variety. 2THRV Whole Food Fuel Gel supplies 30g carbohydrate per pouch.
plan flavour and texture changes
Sweet fatigue is real. Rotate neutral, sweet and savoury options before aversion becomes total. Smaller portions are easier to restart after a low patch than one large aid-station meal.
Keep a simple record by hour or checkpoint. Memory becomes unreliable after many hours.
caffeine and night running
Caffeine can support vigilance and endurance, but late dosing may cause anxiety, gut symptoms or sleep disruption after the race. Set a maximum before the start and count all sources.
Use drop bags to reset the plan: fresh bottles, known food, spare gels and a written checklist.
the bottom line
An ultra is not a marathon with more gels. Duration changes appetite, texture tolerance, sleep and logistics. Build the numbers, practise the timing and keep what works under real training pressure.
For a food-first 30g carbohydrate option with 250mg sodium, see 2THRV Whole Food Fuel Gel. For broader context, read our Australian natural energy gel comparison.
frequently asked questions
can i fuel an ultra with gels only?
Some athletes can for shorter ultras, but many benefit from texture and flavour variety. Test the complete mix.
how many calories per hour for an ultra?
The ISSN position stand gives a broad 150–400kcal per hour range. Body size, pace, duration and tolerance change the appropriate target.
when should i use caffeine?
Many ultrarunners save some for later or night sections. Practise dosage and set a pre-planned maximum.
research and guidance
whole-food endurance fuel