Trail and ultra fuel
Aid stations can lighten the load. Your own tested food and drink make the gaps less uncertain. Use both, and build enough flexibility for changing weather, terrain, appetite and tired decisions.
The short answer
Plan around time on feet, climbing, terrain, weather and what the event aid stations actually give you. Carry enough familiar fuel to reach the next dependable stop, then use aid stations and drop bags to save weight and give yourself some variety.
Ready-made fuel packs
Compare our ready-made trail running bundles by brand. Each pack includes fuel for the main effort and one rehearsal; adjust it around aid stations, carrying space and fluid access. These are based around a six hour effort.
Loading available fuel packs…
Use support without depending on perfect support
Supported
Confirmed water, familiar food and dependable drop-bag access can reduce what you carry. Check this year’s event guide rather than trusting an old plan as events often change routes, aid station points and terrain.
Personal
Take enough tested fuel to reach the next dependable option, especially when a particular product type or dietary requirement matters. And always carry some contingency in case you can't get what you need at the next aid station.
Contingency
A spare gel, a different texture or a small planned caffeine reserve can cover a delay or flavour fatigue without turning your running vest into a shop!
When the event runs into the night
Flavour fatigue
Sweet gels can become hard work after several hours. Mix drink, chews, bars and suitable normal food around the effort and what your stomach will accept.
Night running
Set prompts before fatigue builds. Choose wrappers, bottles and storage you can handle with a headtorch, gloves or cold hands.
Caffeine
Caffeine can help some athletes, but it may also upset the stomach, increase anxiety or disturb sleep later. Test the dose, timing and total amount in training.
Conditions
Heat
Do you see salt marks on your clothes after more intense or longer efforts? You may be a heavy sweater. Pay attention to any cramping, you may need to think about your electrolyte intake.
Cold
Cold can dull thirst and heat appetite. Use warm options where available in the cold, drink at regular intervals in the heat, and keep your fuel handy, especially when under gloves and layers.
Self-supported
Water capacity, quality and fuel/food access become part of the route itself. Follow the event rules and local safety guidance.
After the finish
Immediate
There’s no prize for forcing the perfect recovery product into an unsettled stomach. Begin with fluid and food you can comfortably keep down and take it from there.
Next day
Return to regular meals, spread protein across the day and use gentle movement when it leaves you feeling better, not more tired.
Training
Sleep, mood, soreness and how normal life feels can all show whether fatigue is still building.
Compare the options
| Scenario | Event support | What you carry | Main risk | How to mitigate |
|---|---|---|---|---|
| Supported 50 km | Frequent aid | Tested fuel between stations | Starting too hard or fuelling too late | Settle into an early routine, use watch or phone alerts to remind you about fuelling or hydration |
| Longer ultra with drop bags | Aid plus bag access | Core fuel and critical spares | Assuming every bag appears exactly when wanted | Duplicate some of your essential fuel |
| Mountain event with limited aid | Longer gaps | More fluid, food and weather margin | Underestimating time on feet | Plan by time between points, carry back up fuel |
| Self-supported long day | None or informal | Food, fluid and water-treatment plan | Access failure, terrain change or delay | Separate emergency reserve |
On a phone, swipe the table sideways to compare every column.
Shop trail and ultra fuel
Compare current gels, chews, drink mixes and bars. Prices and availability come from the live product range.
Compact carbohydrate for climbs, harder efforts or limited carrying space.
Combine fluid with carbohydrate, or keep hydration separate when conditions keep changing.
Useful earlier in a long day when the effort is steady and chewing feels comfortable.
A lot to carry?
Add the event, expected duration, conditions, experience and preferences. Fuel Finder will suggest a practical product plan for you to test and adjust on long training days.
General endurance fuelling guidance, not medical advice. Test products and quantities in training before race day.
Common questions
General guidance for healthy adults. Your health, experience and event still matter.
No. Use dependable event support where it helps, while carrying enough familiar fuel for the gaps, your dietary needs and one sensible backup.
Practice the products and timing during relevant training. Build the demand gradually, and change one thing at a time if nausea, bloating or urgency appears.
There’s no universal timing. Consider your usual intake, sensitivity, event duration and the sleep you still need. Test the plan in training and keep a clear count of the total amount.
Sources and further reading
We’ve used research and recognised sports guidance to shape the practical advice above. Open the sources when you want the detail behind a recommendation.
Position stand covering variety, gut training, fluid, sodium and caffeine in very long races.
Systematic review showing possible benefits, alongside uncertainty, from repeated race feeding practice.
Current consensus on heat, hydration, individual sweat losses and sodium.
Explains why products should have a clear job and be trialled before competition.
