Building Your Marathon Fuelling Plan From Week One

Training for a marathon is daunting enough on its own, and adding fuelling into the mix can make it feel even more complicated. The good news is that fuelling doesn’t need to be overwhelming. By thinking about nutrition from week one, you can build simple, sustainable habits that support your training, give you time to practise fuelling, and grow confidence in what works for your body.

This article outlines the key fuelling areas to focus on during marathon training, helping you lay strong foundations early on.

What Is Marathon Fuelling?

Marathon fuelling can be split into two equally important areas: everyday fuelling and fuelling during your runs.

Everyday fuelling focuses on ensuring your body has enough energy to cope with the training load. Staying in energy availability helps reduce injury risk, supports training adaptations, improves performance, and ensures your wider nutrition needs are met.

Fuelling during runs becomes increasingly important as training progresses. The body can only store enough glycogen to fuel around 60–90 minutes of running at higher intensities. When runs extend beyond this, taking on fuel during the session helps delay fatigue and reduces the risk of “hitting the wall”, allowing you to maintain pace for longer.

Daily Eating Foundations

A strong fuelling plan starts with good everyday nutrition. This means eating regular meals, avoiding skipped meals (especially on training days), and including a variety of food groups.

Carbohydrates are particularly important during marathon training. Including a source of carbohydrate at meals helps maintain muscle glycogen levels and ensures you have the energy needed to train consistently and recover well.

Fuelling Around Your Runs

Before your run, particularly if you are running within 60 minutes of eating, a small carbohydrate snack can help increase blood glucose levels and provide an initial energy boost. Simple, easy to digest options such as a banana, flapjack, sports drink, or gel work well.

After your run, recovery should be a priority. Having a snack or meal containing both carbohydrates and protein as soon as you can helps kick start recovery, replenish energy stores, and prepare your body for the next training session.

Fuelling During Your Runs

Many runners struggle with fuelling during runs, often because they only try it on race day. Introducing fuel during long runs allows you to practise in a low-pressure environment.

Start with small amounts, gradually increase your carbohydrate intake, and trial different products such as gels, chews, or sports drinks. This helps you identify what works best for you and reduces the risk of unwanted gastrointestinal issues. Training is the time to experiment, so race day holds no surprises.

Hydration

Hydration does not need to be complicated. Drinking regularly throughout the day and responding to thirst cues is usually enough to maintain good hydration.

However, some situations require extra attention. In cold weather, thirst may be blunted despite ongoing fluid needs. In hot conditions, water alone may not be sufficient due to higher sweat losses. In these scenarios, electrolyte supplements can be useful, helping replace lost electrolytes, improve fluid absorption, and encourage adequate fluid intake.

Key Takeaways

• Don’t overcomplicate fuelling, build habits gradually and learn what works for your body
• Practise fuelling during training, not on race day
• Include carbohydrates regularly in meals, especially around key sessions
• Prioritise recovery to support consistent training
  

Your nutrition doesn’t need to be perfect or complex. By focusing on these key areas throughout your training block, you’ll be well prepared for marathon day and give yourself the best chance of reaching your goal.