Fuel for Triathlon: Complete Triathlon Nutrition Guide | FTP Endurance Fuel
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Fuel for Triathlon: One Plan, Three Disciplines
You cannot eat in the water and it is hard to eat at run pace — which makes the bike leg your moving buffet. Here is how to plan all three.
Shop Race FuelPastilles that live happily in a bento box or race belt
Quick answer: fuel a triathlon by front-loading before the swim, taking on the bulk of your carbs during the bike leg (60–90g per hour for races over 90 minutes), and switching to small, frequent doses on the run. Two FTP pastilles are roughly 30g of carbs — easy to count on the bike, easy to carry in a race belt.
Why triathlon fuelling is its own puzzle
Multisport racing splits your fuelling window into three unequal parts. The swim gives you nothing — you race it on whatever you ate beforehand. The run gives you a jostling stomach and limited carrying space. Only the bike offers steady posture, easy access to food and time to digest. Triathletes who fuel well treat the bike leg as the engine room of their whole race, banking carbs that will pay out on the run.
Get it wrong and the bill always arrives in the final discipline: the classic triathlon fade is a run collapse caused by a bike leg spent under-eating. Get it right and you overtake people jogging home on empty.
Race-day fuelling plan, leg by leg
| Race phase | Strategy | Practical notes |
| Pre-race | Carb-rich meal 2–3 hours out; sip fluids to the start | This meal fuels your entire swim |
| Swim | No intake possible | Nothing to do but swim well |
| T1 | Grab your first carbs as you mount | Pastilles pre-loaded in your bento box |
| Bike | 60–90g carbs per hour, every 15–20 minutes | The moving buffet — bank carbs for the run |
| T2 + Run | Small doses little and often; ease off if the gut protests | A few pastilles in the race-belt pocket |
| Finish | Carbs within the hour to kick-start recovery | Especially if you race again soon |
Rehearse your race plan in training
The first rule of triathlon nutrition: never try new fuel on race day.
Race-belt and bento-box logistics
Triathlon punishes fiddly packaging. In T1 your hands are wet and shaking; at run pace nobody wants to tear foil with their teeth. Pastilles solve both: tip a bike leg's worth into your bento box before the start, and drop three or four into the race-belt pocket for the run. No wrappers to litter, no half-squeezed gels glueing your fingers to the bars.
Because glucose and fructose cross the gut wall via different transporters (SGLT1 and GLUT5), the 1:1 blend in FTP pastilles supports absorption of up to 90g per hour — exactly the range you want on the bike leg of a middle- or long-course race. On the run, drop to smaller, more frequent doses: your gut gets less blood flow at run intensity, so little and often wins. Pair with an electrolyte bottle on the bike, and use the aid stations for water on the run.
Kit for your race kit bag
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Season-long supply for training and race day alike.
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Tart Cherry Taster Pack
Test your race fuel in training before committing to bulk.
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FTP Electrolyte Tablets — Cherry
Bike-bottle hydration to run alongside your carb plan.
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Shop ElectrolytesCommon Questions
How do I fuel during the swim?
You do not — and that is fine. A carb-rich meal two to three hours before the start carries you through. The key is starting to eat quickly once you are on the bike, not making up for the swim later.
How many carbs per hour on the bike leg?
For races over 90 minutes, target 60–90g per hour on the bike. That is 4–6 pastilles per hour, spread in small doses every 15–20 minutes rather than eaten in one go.
Do I need to eat during a sprint triathlon?
Mostly no. Sprint races generally finish inside 90 minutes, so a good pre-race meal covers you. A couple of pastilles on the bike will not hurt if you are racing at the longer end, but sub-90-minute efforts do not demand in-race carbs.
How do I carry fuel on the run?
A race-belt pocket or tri-suit pocket holds several pastilles without bouncing or leaking. Take one or two at a time between aid stations, washed down with water, rather than trying to force a big hit mid-run.
Nail your nutrition before the gun goes
Train with it, race with it — award-winning fuel for swim, bike and run days.
Shop Race FuelKeep reading: The Complete Triathlon Nutrition Guide · Energy Chews vs Gels · Glucose:Fructose Ratios Explained. Related guides: Hydration & Electrolytes · Carb Loading Guide.
