Fueling That Works for You: Learn, Practice, and Adjust
There is no shortage of advice about endurance nutrition. Different products, higher carbohydrate targets, and stories about what worked for someone else can make it difficult to know where to start.
Learning from other athletes is valuable. But your fueling plan needs to work for your body, your event, and the conditions you will face.
Start with your needs and experience
Before changing your fueling, consider:
How long will you be exercising?
What intensity will you need to sustain?
Will you be cycling, running, or doing both?
What conditions are you preparing for?
What have you already tolerated successfully?
A product recommendation gives you something to investigate. Training gives you the opportunity to find out whether it works for you.
Understand carbohydrate targets
Higher carbohydrate intakes have helped move endurance athletes away from underfueling. However, a bigger number is only useful when it supports your performance and you can tolerate it consistently.
There is no universal limit of 300 calories per hour. For exercise lasting roughly 1–2.5 hours, established guidance commonly recommends 30–60 grams of carbohydrate per hour. For longer events, intakes up to 90 grams per hour may be appropriate, generally using combinations of carbohydrates such as glucose and fructose. These are guidelines to individualize, rather than a requirement for every session or athlete.
You may hear about athletes consuming 100 grams per hour or more. Before copying that approach, look at the context: their event, preparation, practiced tolerance, and support.
The question to ask is: What amount can I consistently tolerate that helps me sustain the effort and finish well?
Match your fueling to the activity
The same fueling approach may feel very different on the bike and run.
On a steady training ride, you may comfortably use a combination of drinks, gels, chews, and solid food. As intensity increases, chewing and managing food can become less practical.
During a triathlon, your bike fueling also needs to leave you ready to run. A bottle or food combination that feels comfortable while cycling still needs testing in sessions that include running afterward.
Gels and drinks can be convenient on the run, but they also require practice. Consider the amount you take at once, the product’s water instructions, and how you will carry or access everything.
Heat, exercise intensity, hydration, and individual tolerance can all contribute to gastrointestinal symptoms. If something goes wrong, review the whole situation before blaming one ingredient or product.
Know what is in your products
Read the carbohydrate amount per serving and check how many servings you are actually using.
A bottle, gel, and several chews all contribute to the same hourly total. Knowing that total makes your plan easier to practice and adjust.
Ingredient names also need context. Ingredient order alone cannot tell you how long a product will provide energy. Some athletes tolerate particular ingredients or combinations better than others. Your repeated experience matters more than a product’s popularity.
Practice your plan and report what happens
Fueling is a skill you can develop alongside fitness. Repeated practice can improve your ability to tolerate carbohydrate and fluid during exercise. Build gradually from an intake you already manage successfully.
After key sessions, record:
What you ate and drank, including amounts.
How long and hard you exercised.
The conditions.
How your energy and stomach felt.
Whether you could maintain the planned effort.
Share that information with your coach. “My nutrition didn’t work” starts the conversation; the details help us make a useful adjustment.
Reflect before planning what comes next
Before rushing into next season’s goals, look back at this season.
Where did you feel strong? When did your energy fade? Which fueling choices worked repeatedly? What needs more practice?