Running out of fuel is one of the most common reasons marathons fall apart in the last 10K. The fix is simple: take in carbs on a steady schedule, starting early, and practice it in training before race day.
The quick answer
Most marathoners do well with one energy gel every 30 to 45 minutes, plus one about 10 to 15 minutes before the start. For a runner finishing in around 4 hours, that usually means 6 to 8 gels. Faster runners need fewer, and runners on the course longer may need more.
Why the timing matters
Your body stores a limited amount of carbohydrate. On runs longer than about an hour, those stores start to run low. General sports nutrition guidance suggests 30 to 60 grams of carbohydrate per hour for longer efforts, and some trained athletes go higher. Fueling on a schedule, before you feel tired, keeps your energy steady instead of waiting until you hit the wall.
A sample marathon fueling plan
- 10 to 15 minutes before the start: one packet
- Around mile 4 to 5: first packet on the course
- Every 30 to 45 minutes after that: one packet with a few sips of water
- Final 10K: a caffeinated option can help with focus when the miles get hard
Don't forget electrolytes
You lose sodium and other electrolytes in sweat, especially on warm days. Many gels only provide carbs, so runners end up juggling salt tabs or sports drinks. A gel with sodium, potassium, and magnesium built in covers both needs in one packet.
Practice it in training
Race day is not the time to try something new. Use your long runs to test your gel, your timing, and how your stomach handles it. If a plan works on your 18 to 20 mile runs, it will work on race day.
A natural option
Beonixe Energy Honey is a natural energy gel made from raw honey and electrolytes, with no maltodextrin, corn syrup, or artificial flavors. Pure Raw is caffeine-free for early miles, and Dark Chocolate adds natural caffeine for the late ones. The slim packets fit easily in a shorts pocket or race belt.
This article is general information, not medical advice. Fueling needs vary, so adjust based on your body, pace, and conditions.
