Cycling nutrition during a ride has three separate numbers: carbohydrate, fluid and sodium. They interact, but one cannot be inferred from another. Start with the ride’s duration, intensity, purpose and conditions, then build a plan the rider can carry and repeat.
Roadman’s podcast conversations with practitioners such as Asker Jeukendrup and Dr David Dunne help identify the practical questions. The boundaries below come from published reviews, trials and consensus statements. This is a planning framework, not a diagnosis or a personalised medical prescription.
The quick cycling nutrition guidelines
| Ride demand | Carbohydrate starting frame | Fluid and sodium decision |
|---|---|---|
| Short or easy ride | During-ride carbohydrate may be unnecessary when starting adequately fuelled | Drink to thirst; carry enough for conditions and remoteness |
| Longer or harder performance ride | About 30–60 g/h is a common range | Use thirst and representative sweat-rate observations; count sodium already in food and drink |
| Event beyond roughly 2.5 hours | Up to about 90 g/h can be useful, usually with glucose or maltodextrin plus fructose | Rehearse the exact bottle, refill and food plan in comparable weather |
| Selected high-performance event | About 120 g/h is an advanced and developing strategy, not a default | High carbohydrate concentration makes fluid coordination and gut rehearsal more important |
These are planning ranges, not minimums. A two-hour easy social ride, a two-hour road race and two hours of threshold intervals do not have the same nutrition job.
Step 1: define what the ride must accomplish
Record:
- expected duration and intensity;
- whether performance is the priority or the ride is deliberately easy;
- temperature, humidity and exposure;
- climbing, technical sections and safe opportunities to eat;
- bottle, feed-station and shop access;
- products the rider has already tolerated; and
- medical or gastrointestinal considerations that require qualified advice.
The 2023 meta-analysis of 136 studies found an overall endurance-performance benefit from carbohydrate during exercise, with larger effects in longer exercise and differences by protocol and participant training. That supports matching fuel to the work; it does not prove that every recovery spin needs a high intake.
Step 2: choose the carbohydrate range
Established guidance on carbohydrates for training and competition and carbohydrate during exercise commonly uses 30–60 g/h for longer exercise and up to 90 g/h for events beyond roughly 2.5 hours. At higher rates, multiple transportable carbohydrates—typically glucose or maltodextrin plus fructose—support greater exogenous carbohydrate delivery than glucose alone.
Do not turn those ranges into a compulsory staircase. The correct starting target is the lowest reliable intake that supports the required performance and recovery.
Where 120 g/h fits
Very high intake is a developing, event-specific practice. In 11 highly trained male cyclists, 120 g/h increased exogenous carbohydrate oxidation relative to 90 g/h but did not spare more endogenous carbohydrate; the protocol did not test performance. In a 2026 crossover study of 16 trained cyclists and triathletes, 120 g/h preserved critical power after three hours better than 60 g/h or water under the study conditions.
That is meaningful evidence, but it is not a general instruction. Use 120 g/h only when the event demand justifies it, lower targets are already reliable and the exact plan has been rehearsed.
Step 3: count every food and drink source
Carbohydrate per hour is the sum of:
drink mix + gels + chews + bars + bananas, rice cakes or other food
If the target is 60 g/h and the bottle provides 30 g/h, food and gels need to provide the remaining 30 g/h—not another 60. Check labels because a “gel” can contain very different amounts between products.
Use the Cycling Nutrition Calculator to create an initial estimate. Then write the actual packet, bottle and food arithmetic. The cycling gels guide covers packet format, caffeine and water directions without pretending one brand is universally best.
Food is not metabolically inferior by definition. A systematic review of food-first carbohydrate supplementation found broadly similar performance or capacity outcomes between food and supplements, although some food comparisons caused more gastrointestinal symptoms. Gels and drinks are often easier at race intensity; food can provide variety and satiety during long, lower-intensity riding.
Step 4: set fluid from the rider and conditions
There is no evidence-based reason to assign every cyclist 500–750 ml/h. Sweat rate varies with body size, intensity, heat, clothing, acclimation and the individual. Both insufficient replacement and excessive drinking can cause problems.
The NATA fluid-replacement position statement recommends individual sweat-rate assessment and avoiding both hypohydration and hyperhydration. A review of personalised fluid and fuel in the heat likewise treats sweat rate and the interaction between liquid fuel and fluid needs as central.
A field sweat-rate estimate
On a representative ride, record nude or dry-clothing body mass before and after, fluid consumed, urine produced and ride duration:
sweat loss (L) ≈ pre-ride mass (kg) − post-ride mass (kg) + drink (L) − urine (L)
sweat rate (L/h) = sweat loss ÷ ride hours
One kilogram of acute body-mass change is commonly treated as approximately one litre of water for field planning. The estimate is not a command to replace 100% of loss during every ride. Use it with thirst, comfort, performance, course access and the need to avoid overdrinking. Repeat it when temperature or intensity changes.
Finishing heavier than starting is a clear warning that intake exceeded losses. The exercise-associated hyponatraemia consensus identifies excessive fluid consumption as the main behavioural risk. Sodium cannot make forced overdrinking safe.
Step 5: individualise sodium instead of guessing from duration
Sodium need depends on sweat volume, sweat sodium concentration, acclimation, diet and event conditions. A fixed “500–700 mg/h after two hours” rule hides that variability.
Start by adding the sodium already present in drink mix, gels and food. Review salt marks, repeated post-ride symptoms and measured sweat loss as observations—not diagnoses. When sodium replacement materially affects a long hot event or a rider has a relevant medical history, use a qualified sports dietitian or clinician and, where appropriate, a validated sweat assessment.
Do not use sodium as a cramp guarantee or a treatment for symptoms that have not been assessed. And do not respond to concern about low sodium by drinking more fluid than is being lost.
Step 6: build the event timeline and rehearse it
An event plan should show:
| Time or course point | Carbohydrate | Fluid | Sodium/caffeine | Carry or collect |
|---|---|---|---|---|
| Start to first feed | Exact product and grams | Bottle volume | Milligrams already present | Pocket/bottle |
| Feed to feed | Exact product and grams | Planned refill | Updated running total | Feed bag/shop |
| Final section | Exact product and grams | Remaining access | Whole-event total | On bike |
Test the plan at representative duration, intensity and temperature. Record total carbohydrate, fluid, caffeine, sodium, symptoms and execution failures. If the rider became nauseated, do not change carbohydrate type, dose, fluid and sodium together; one change preserves cause and effect.
The 2023 gut-training systematic review found varied protocols lasting four to 28 days. Some studies improved symptoms or malabsorption and several results were unclear. Practice is useful, but there is no guaranteed weekly increase or universal date at which 90 g/h becomes comfortable.
What to do when the plan goes wrong
Missed carbohydrate
Resume with a normal tolerable portion. Do not automatically swallow several gels at once; the sudden concentration may create another problem. Adjust the remaining timeline and use the next safe eating opportunity.
Gastrointestinal symptoms
Reduce intensity where safe, stop escalating the intake and note the timing, product, concentration, heat and fluid. Use the cycling gastrointestinal-distress guide for a controlled review.
Unexpected heat
Slow the pace if necessary, use available cooling and revise fluid access. Do not preserve a prewritten power or nutrition target when conditions have materially changed.
Persistent vomiting, confusion, severe headache, collapse, blood in the stool, severe abdominal pain or symptoms that continue away from exercise require appropriate medical assessment. Confusion, collapse or deteriorating neurological symptoms during a long event are urgent; do not assume the answer is another gel, salt tablet or bottle.
Common in-ride nutrition mistakes
- copying a professional carbohydrate number without the event demand or preparation;
- counting gels but forgetting carbohydrate in bottles and food;
- using a universal 2:1 ratio as proof of tolerance;
- forcing a fixed fluid volume despite low sweat loss or strong thirst cues in heat;
- assuming sodium prevents hyponatraemia while continuing to overdrink;
- testing products only on easy rides;
- changing dose, concentration, fluid and product at the same time;
- relying on aid-station products that have never been tested; and
- confusing a planning estimate with an individual medical prescription.
Roadman’s in-ride nutrition verdict
Use three separate targets. Set carbohydrate from the session demand; count every source. Bound fluid with thirst, representative sweat-rate observations and access; avoid both substantial dehydration and overdrinking. Add sodium from the rider’s losses and existing food or drink, not one internet number.
Then write the timeline and rehearse it. The plan that matters is not the one with the highest carbohydrate headline. It is the one the rider can execute safely at event demand.
This guide was last checked on 26 August 2026. For the wider system, use the cycling nutrition hub, cycling gels guide, hydration guide and race-day nutrition timeline. Corrections can be submitted through the Roadman corrections page.