Open any popular running nutrition guide and you will find advice calibrated for a specific kind of runner: the one who starts a marathon at 7am and is eating brunch by 10:30. The gels are timed for a 3:30 finish. The hydration plan assumes two hours of effort, maybe three. The advice to "eat before you're hungry" is framed around a window that closes long before you cross the line.
If you're spending 5, 6, or 7 hours on your feet, that advice doesn't just fail to help. It can actively hurt you.
Here's what's actually different about fueling for longer time on feet, and what to do instead.
The Core Problem: You Are Not A Fast Runner With More Kilometers
The assumption baked into most race nutrition advice is that effort scales linearly with time. Run longer, eat more gels. But that's not how the body works for slower runners, and it misses the most important variable: how long your digestive system has been working under stress.
After about 3 hours of sustained effort, your gut starts to rebel against processed sugars. The gels that felt fine at kilometer 10 become genuinely difficult to tolerate by kilometer 30. This is not a personal failure. It is physiology.
Fast runners don't experience this because they're done before the window closes. You're still out there. So your strategy has to be different from the start.
After 3 hours, your gut starts to rebel. Plan for this before it happens.
Real Food Is Not Optional, It's The Strategy
For runners spending more than 4 hours on course, real food is not a nice addition to a gel plan. It is the plan. Your digestive system handles solid, familiar food better than concentrated sugar gels at the 4 and 5 hour mark. The runners who bonk late in long races are often the ones who over-relied on gels and didn't transition to food.
What works: bananas, boiled potatoes with salt, rice balls, peanut butter sandwiches on white bread (low fiber, quick energy), dates, small pieces of banana bread. Aid stations at larger races often have these from kilometer 30 onwards. Know what's available at your race in advance.
What to avoid: anything high in fiber or fat mid-race (they slow gastric emptying), anything carbonated, anything you haven't tested in training. Race day is not the day to discover that a particular gel flavor disagrees with you at hour four.
The golden rule: Nothing new on race day. Every food and drink you plan to consume in the race must have been tested on a long training run first. This is even more important for slower runners because you are eating across more hours and more gastrointestinal stress.
Sodium Is More Important Than You Think
Electrolyte loss becomes critical past the 3-hour mark. Most commercial sports drinks are formulated for shorter efforts and don't account for the sodium lost over a 5+ hour race in warm conditions. Hyponatremia, drinking too much plain water without enough sodium, is actually more common in slower runners than fast ones, precisely because of the longer time on course.
Practical steps: carry salt tablets or electrolyte capsules and take them on a schedule (typically every 45-60 minutes), not just when you feel thirsty. If the race offers sports drink at aid stations, alternate it with water rather than drinking water only. Salty snacks at aid stations (pretzels, salted potatoes) are your friend.
Eating Schedule: Think In Windows, Not Kilometers
Fast runners often fuel by kilometer marker. "I'll take a gel at 15k, 25k, 35k." For slower runners, a time-based schedule works better because it accounts for the actual pacing variability of a longer race.
A workable framework for a 5+ hour half or full marathon: eat something small every 30-40 minutes from the first hour, prioritizing real food from the 3-hour mark. Don't wait until you're hungry. Hunger is a signal that you're already behind.
Sample schedule for a 6-hour marathon: Gel or chews at 45 min, 1:30, 2:15. Real food (banana, potato, rice) from 3:00 onwards every 30-40 min. Electrolytes every 45-60 min throughout. Water at every aid station. Adjust based on heat, effort, and how your stomach is responding.
Practice, Practice, Practice
Your long training runs are not just fitness. They are nutrition rehearsals. Every run over 90 minutes should involve testing your race-day food and drink strategy. What works in your kitchen or at 45 minutes might not work at hour 4 in race conditions.
Pay attention to what your stomach tells you on long runs. Keep notes. Some runners do fine on gels for 5 hours, others need to transition to real food at 2 hours. You won't know until you experiment in training, which is exactly when you should be experimenting.
The running world largely writes its nutrition guides for runners who aren't you. That doesn't mean the information doesn't exist, it means you have to seek it out deliberately, adapt what you find, and test everything on yourself.
You're out there longer than most. Your fuel plan should reflect that. And when you cross that finish line after 5, 6, or 7 hours on your feet, that's not a consolation prize. That's endurance.