The importance of marathon training nutrition cannot be overstated. You can start a marathon training block full of motivation, complete every session on your plan, and still fall short of your goals if your nutrition is not supporting your training. Marathon preparation places a huge demand on the body, and without the right fuel your recovery, performance and adaptation to training will suffer.
Understanding your nutritional needs during a marathon training block is essential. Hitting your calorie targets is important, but so is understanding the balance of carbohydrates, protein, and fats your body requires during the different stages of training. Proper marathon training nutrition can make the difference between finishing your race strong or struggling in the final miles. During training, it can also determine how well you recover after long runs and high mileage weeks.
Marathon training involves pushing your body to new limits, but in order to do that consistently you need to fuel properly. In this post we will look at why good nutrition is so important during marathon training, how to set nutritional objectives, tips for tracking your intake, race weight considerations, fuelling the different phases of training, and how to approach carb loading before race day.
Why Good Marathon Training Nutrition is so Important
Training for a marathon involves a significant increase in energy expenditure. As your mileage builds, your body burns more calories both during running and during recovery. It can be tempting to use marathon training as an excuse to eat whatever you want, especially when you have completed a long run and your body is crying our for food.
Your body requires carbohydrates, protein, healthy fats, vitamins, and minerals whether you are training or not. During marathon training your carbohydrate needs increase because carbohydrates are your primary fuel source for running. Your protein needs also increase because your muscles need amino acids to recover, repair, and adapt after hard sessions and long runs.
Energy is stored in the muscles and liver in the form of glycogen. These stores are limited and generally provide enough fuel for around 60 to 90 minutes of running depending on the intensity of the effort. Once glycogen stores become depleted, fatigue increases rapidly and performance begins to decline. Many runners know this feeling as “hitting the wall”.
For shorter and easier runs, your existing glycogen stores may be enough to get through the session comfortably. Longer runs, marathon pace workouts, and harder sessions require additional preparation. Eating a carbohydrate rich meal before these sessions helps top up glycogen stores and provides a more reliable source of energy.
The timing and type of carbohydrates also must be considered. The closer you get to your run, the whiter the carbs. Foods such as white bread, rice, rice cakes, bagels, or rice krispies, can provide quick energy without causing digestive discomfort.
After your sessions, nutrition becomes just as important. Recovery nutrition helps repair muscle tissue, replenish glycogen stores, and prepare the body for the next session. Consuming protein within an hour after training is a simple way to support recovery. Chocolate milk has become popular among runners because it provides a combination of carbohydrates, protein, and fats in an easy to consume form, although there are many other suitable options such as protein smoothies, yoghurt with fruit, eggs on toast, or rice with chicken.
Hydration also plays a major role in your marathon training nutrition. The body functions more efficiently when it is properly hydrated. Water supports circulation, temperature regulation, nutrient transport, and muscle function. Staying hydrated consistently throughout your training block will improve performance and recovery while reducing the risk of fatigue and cramping.
Setting Marathon Nutrition Objectives
Most runners spend a lot of time organising their marathon training plan, scheduling their long runs, workouts, recovery days, but very few runners put the same thought into their marathon training nutrition plan.
If you want to get the most from your training, setting nutritional objectives is extremely valuable. Your nutritional needs will change throughout the training cycle depending on your mileage, training intensity, and recovery demands. Setting weekly calorie goals based on your training load can help ensure you are fuelling adequately. Higher mileage weeks require more calories and more carbohydrates. Recovery weeks may involve slightly lower calorie requirements, but higher protein. Having a rough structure in place prevents under fuelling and helps maintain consistent energy levels throughout the block.
Nutritional objectives should also include hydration goals, protein intake targets, and strategies for long run fuelling. Practising your race nutrition during training is just as important as practising your pacing.
Nutrition Tracking Tips
Tracking your nutrition can be one of the most useful tools during marathon training. Many runners underestimate how much or how little they are eating until they actually record it. Using an app such as MyFitnessPal for even one or two weeks can provide valuable insight into your eating habits and macro breakdown. You may discover that you are not consuming enough protein to support recovery or enough carbohydrates to sustain higher mileage weeks.
Tracking also helps you understand the nutritional value of different foods. Over time you begin to recognise which meals provide the best macro break down and which choices leave you feeling sluggish or under fuelled.The goal is not to obsess over calories or become overly restrictive. The purpose of tracking is to create awareness and guide your marathon training nutrition plan.
Race Weight and Performance
There is a relationship between body weight and running performance. Carrying excess body weight can increase the energy cost of running, and studies have suggested that small reductions in body weight may improve running economy and marathon times.
However, chasing weight loss during marathon training should be approached carefully. The goal is not just about becoming lighter but to be lean and strong not skinny and weak. Losing too much weight too quickly can reduce muscle mass, weaken recovery, and increase injury risk. Marathon training already places significant stress on the body, so under fuelling can quickly lead to fatigue, poor performance, and illness.
Tracking your food intake and body weight can help you identify whether your marathon training nutrition is supporting your training properly. Gradual and sustainable changes are far more effective than aggressive dieting during a marathon block. Your ideal race weight is the weight at which you feel strong, energised, and capable of training consistently while recovering well.
For more detailed information on your ideal marathon race weight visit JMRuncoach.
Fuelling for Each Phase of Marathon Training
We break marathon training into three phases: Base, Pace, and Race. Each phase has slightly different nutritional demands.
Base Phase
The base phase focuses on building aerobic fitness, consistency, strength, and discipline. Training intensity is usually lower, but volume begins to increase steadily.
During this phase your macro breakdown may look something like:
20% protein
50% carbohydrates
30% fats
Carbohydrates provide the fuel needed for consistent running, while healthy fats and protein support recovery and overall health.
Pace Phase
The pace phase introduces harder workouts, increased volume, and more race specific sessions. Recovery becomes even more important during this stage.
Protein intake becomes increasingly important because your muscles require more nutrients to adapt and strengthen after tougher sessions.
A suitable macro breakdown during this phase could be:
25% protein
50% carbohydrates
25% fats
This balance supports muscle repair while still maintaining enough carbohydrates for quality training sessions.
Race Phase
The race phase includes peak mileage, marathon specific workouts, and tapering towards race day. Glycogen stores need to remain topped up in order to support performance and recovery.
A typical macro breakdown during this phase may shift to:
20% protein
60% carbohydrates
20% fats
Increasing carbohydrate intake during this phase helps maximise glycogen storage and prepares the body for marathon day.
The Carb Loading Phase
Carb loading generally begins around 48 hours before the marathon. The goal is to maximise glycogen stores so your body has the energy available to sustain marathon pace for longer.
General recommendations often suggest consuming around 8 to 10 grams of carbohydrates per kilogram of body weight during the carb loading period. However, individual needs vary depending on training background, body composition, muscle mass, and digestive tolerance. Experienced runners are often better adapted to storing glycogen efficiently, while runners with higher muscle mass may have greater storage capacity.
One of the biggest mistakes runners make is trying to carb load properly for the first time before race day. Marathon nutrition must be practised during training, particularly before long runs. Testing different meals and carbohydrate sources allows you to identify what works best for your body. The night before your marathon is not the time to experiment with huge portions or unfamiliar foods. The aim is to consume meals that leave you feeling energised and comfortable heading into race day.
Choose foods that digest well and avoid anything that causes bloating, stomach discomfort, or intestinal issues. Simple carbohydrate rich meals such as pasta, rice, potatoes, bread, pancakes, oats, or bagels are common choices among marathon runners. Carb loading should leave you feeling fuelled and ready, not heavy and uncomfortable.
Good Marathon Training Nutrition For Better Race Results
Marathon training is about much more than simply logging miles. Your body needs the right fuel to perform consistently across an entire training block. Good nutrition supports every aspect of training from energy levels and recovery to injury prevention and race day performance.
You do not need a perfect diet to run a strong marathon, but you should be aware of what your body requires in order to function and recover. Small improvements in your nutrition habits can have a huge impact over the course of a 16 to 20 week marathon block.
If you want guidance with your marathon training nutrition, structured coaching, strength sessions, and support from a community of runners working towards similar goals, check out Achieve Running Club. If you are training for your first marathon or chasing a new personal best, we can help you understand your nutritional needs so you can recover better, and arrive at the start line feeling confident and prepared.
For more detailed Marathon Training advice check out our range of running guide books.
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