Nutrition in trail running: a comprehensive guide for 2026
Nutrition in trail running is one of the most important aspects of a trail runner’s preparation, yet it is often one of the most overlooked.
Many athletes devote significant attention to training plans, equipment selection and race scheduling, while overlooking the fact that the body requires adequate energy and nutrients to sustain the demands of trail running.
A proper nutrition strategy does more than improve performance during training sessions and races. It also supports recovery, helps reduce the risk of injury and promotes the physiological adaptations stimulated by training.
In other words, nutrition should be considered an integral part of the training process, just like running workouts themselves.
The nutritional needs of a trail runner can vary considerably depending on:
- training volume
- race distance being prepared for
- phase of the season
- individual athlete characteristics.
For this reason, there is no universal strategy that works for everyone. However, some fundamental principles can help build effective and sustainable eating habits over time.
In this article, we will explore the key aspects nutrition in trail running, from the role of macronutrients to the organization of meals before, during and after training sessions.
Enjoy the reading
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Why nutrition in trail running is essential
Trail runners and ultra runners place exceptionally high energy demands on their bodies. Long training sessions, significant elevation gain, limited recovery periods, and races that may last many hours—or even several days—require careful management of energy resources.
When nutrition is not aligned with training demands, the consequences can appear quickly through reduced workout quality, slower recovery and a gradual decline in performance.
Conversely, a well-planned nutritional strategy allows athletes to support their training load and approach both preparation and competition more effectively.
A structured nutrition plan helps:
- provide the energy needed to support training
- promote muscle recovery after demanding efforts
- enhance training-induced physiological adaptations
- support the immune system during periods of heavy workload
- maintain a body composition suited to the sport
- reduce the risk of energy crashes during training and racing.
These factors become increasingly important as race distances and performance goals grow. An athlete preparing for a 20 km trail race will have different nutritional needs than someone training for a 100 km or 100-mile event, but in both cases nutrition remains a key component of performance.
Body weight and performance in trail running
Body weight is often discussed in overly simplistic terms within trail running, when in reality it represents a delicate balance between performance, health and long-term training sustainability.
When nutrition is inadequate or calorie intake does not match training volume, the body may gradually accumulate excess body fat. This is not merely an aesthetic concern—it can directly affect performance.
Excess body fat may lead to:
- increased energy expenditure while running
- reduced climbing efficiency
- greater difficulty managing technical descents
- increased stress on lower-limb joints
- a higher risk of injury, particularly during downhill running.
At the same time, it is important to avoid extreme or overly restrictive approaches. Severely cutting calories or eliminating major macronutrients can lead to low energy availability, impaired recovery, and a reduced ability to train consistently over time.
The key is to find a sustainable balance that supports training demands without compromising health or performance quality.
The goal should never be to become as light as possible, but rather to reach a condition where the body is efficient, resilient, and capable of handling substantial training loads over the long term.
From this perspective, body weight should not be viewed as a number to chase, but as the natural outcome of a well-designed nutrition strategy aligned with both activity levels and seasonal objectives.
Nutrition in trail running: macronutrient distribution
In trail running and ultra running, macronutrient management forms the foundation of any nutritional strategy. The objective is not to follow rigid rules, but rather to understand how energy intake should be adjusted according to training demands.
A general guideline may be summarized as follows:
- carbohydrates: approximately 65–70% of total daily calories
- protein: up to 1.5 g per kilogram of body weight
- fats: approximately 20–25% of total energy intake.
These values are not absolute recommendations but useful reference points for building a balanced nutrition plan tailored to endurance training.
Every trail runner has unique nutritional needs based on training volume, seasonal goals, and individual characteristics. For this reason, TRM coaches develop PERSONALIZED NUTRITION PLANS designed to help athletes manage carbohydrates, protein intake and recovery according to their specific preparation.
The role of carbohydrates
Under normal training conditions, trail running nutrition is largely based on carbohydrates, which represent the primary fuel source during endurance exercise.
Key carbohydrate sources for trail runners include:
- pasta
- rice
- bread
- cereals
- potatoes
- fruit
- legumes.
The goal is not simply to increase carbohydrate consumption, but to distribute intake appropriately throughout the day to ensure consistent energy availability and support recovery between sessions.
Carbohydrate requirements fluctuate throughout the year according to activity levels. In particular:
- during recovery or reduced training periods, carbohydrates may account for approximately 55% of daily calories
- during periods of increased training load, carbohydrate intake should gradually increase
- before long runs or important races, carbohydrate intake may rise to approximately 75% of total calories.
This flexibility allows athletes to match energy availability to actual physiological demands while avoiding both deficiencies and unnecessary excess.
The role of protein
Alongside carbohydrates, protein plays an essential role in trail running nutrition by supporting muscle recovery and tissue repair following training.
Important protein sources include:
- lean meat
- fish
- eggs
- dairy products
- legumes
- tofu and soy-based foods.
A daily intake generally not exceeding 1.5 g per kilogram of body weight is sufficient to support physiological adaptations in most endurance athletes.
In some situations, supplementation with branched-chain amino acids (BCAAs) may be considered. However, this strategy should always be evaluated carefully and implemented with guidance from a qualified professional rather than through self-prescribed approaches.
The role of fats
Fats are often viewed as the least important nutrient for endurance athletes, but they perform several essential functions within the body.
In addition to contributing to energy production during lower-intensity exercise, fats support hormone production, assist in the absorption of certain vitamins and contribute to overall health and well-being.
Quality fat sources include:
- extra virgin olive oil
- nuts
- seeds
- avocado
- oily fish.
The goal should not be to eliminate fats from the diet, but to include them in appropriate amounts within an overall nutrition strategy that aligns with performance goals. For most endurance athletes, an intake representing approximately 20–25% of total daily calories is appropriate.
How to organize nutrition in trail running around your training sessions
A large portion of performance is built through proper nutritional planning throughout the training week.
The objective is to adapt nutrition to the specific workout being performed, ensuring that the body has sufficient energy to complete the session while also supporting recovery afterward.
For this reason, it is always advisable to plan meals in advance according to training time, workout duration and training location.
An effective trail running nutrition plan should consider:
- workout timing
- time available between meals and training
- the need for a pre-workout snack
- energy requirements during the session
- post-workout recovery meals
- food and drink availability at the training location.
Making these decisions ahead of time helps eliminate guesswork and allows athletes to approach each workout in the best possible condition.
In the following sections, we will explore how to organize nutrition before, during, and after trail running training sessions.
What to eat before training
The purpose of pre-workout nutrition is to provide adequate energy availability without causing digestive discomfort or feelings of heaviness during exercise.
Food choices depend largely on the amount of time available between eating and the start of training. The closer the meal is to the workout, the more important it becomes to select easily digestible foods while limiting excessive amounts of fat and fiber.
If training is scheduled for early afternoon, lunch should provide gradual and sustainable energy. In these situations, lower-glycemic-index carbohydrate sources may be beneficial.
An example of a pre-workout meal for trail runners could include:
- 100 g of basmati rice
- seasonal vegetables
- 10 g of extra virgin olive oil
- 10 g of Parmesan cheese.
This combination provides readily available energy without excessively burdening digestion during the following hours.
When training is scheduled more than three hours after lunch, athletes can generally consume their usual meal provided it is balanced and well tolerated.
For workouts performed in the morning before lunch or later in the evening, a snack during the two hours preceding the session may help prevent starting exercise with depleted energy stores.
Practical options include:
- a carbohydrate-focused energy bar
- approximately 30 g of dried fruit
- 30 g of dark chocolate containing more than 70% cocoa
- a ripe banana
- a slice of bread with honey or jam.
The ideal choice depends on individual tolerance and the type of workout being performed. As always, nutritional strategies should be tested during regular training rather than immediately before an important race.
Proper pre-workout nutrition allows trail runners to begin each session with adequate energy levels, improving training quality and reducing the risk of performance declines during exercise.
What to consume during long training sessions
When a training session lasts longer than one or two hours, nutrition becomes progressively more important in trail running. The body’s energy stores are not unlimited, and inadequate fueling can compromise both workout quality and subsequent recovery.
For this reason, it is advisable to plan your nutrition strategy in advance for longer training sessions. Besides providing energy, these workouts offer the perfect opportunity to test products, quantities and timing strategies that can later be used during races.
Among the primary energy sources commonly used by trail runners are:
- energy gels (approximately 80–115 kcal per serving)
- energy bars (approximately 130–180 kcal per serving)
- sports drinks (approximately 300–350 kcal per 500 ml)
- dried fruit
- small, easily digestible solid foods.
For experienced athletes tackling particularly long training sessions exceeding 60–70 km, energy management requires even greater attention. In these situations, it becomes essential to account for all calories consumed during the session, including solid foods, sugary drinks or even cola, which can significantly contribute to total sugar intake.
The goal is not simply to consume calories, but to build a sustainable nutrition strategy that maintains stable energy levels throughout the entire workout without overwhelming the digestive system.
Are you struggling to determine how many gels to take, what to eat during long runs, or how to avoid energy crashes and digestive issues? With a personalized TRM NUTRITION PLAN, you can develop a tailored fueling strategy that can be tested in training and confidently applied during races.
What to eat after training
Recovery begins the moment your workout ends. Many trail runners devote significant attention to preparing for training sessions and fueling during exercise, but underestimate the importance of the hours immediately afterward.
During this phase, the body must replenish depleted energy stores, repair muscle tissue and prepare for future training sessions. A proper trail running nutrition strategy can significantly improve recovery and reduce fatigue in the days that follow.
For this reason, it is advisable to plan your post-workout meal in advance, particularly after long or demanding sessions.
Immediately after training, it is beneficial to:
- replenish carbohydrates used during exercise
- consume an adequate amount of protein
- restore hydration levels
- promote muscle recovery
- avoid excessive fat intake that may slow digestion.
Generally, the period between 30 and 70 minutes after training represents an ideal window for initiating nutritional recovery.
A practical example of a post-workout meal could include:
- 150 g of pasta
- 2 slices of bread
- 1 banana
- a recovery drink.
Naturally, quantities should be adapted to the athlete’s characteristics and the workload completed. A one-hour run requires different nutritional support than a five- or six-hour mountain training session.
Proper recovery nutrition improves the quality of subsequent workouts and represents one of the most important factors for athletes seeking long-term performance improvements.
Example of a daily nutrition plan for trail runners
After reviewing the fundamental principles nutrition in trail running, it can be helpful to look at a practical example of how meals may be organized throughout a typical training day.
The purpose of this example is not to provide a universal template, but rather to demonstrate how meals can be distributed to meet the energy demands of a training-focused day.
A possible daily nutrition schedule for a trail runner is outlined below.
| Time of Day | Goal | What to Eat | Practical Example |
|---|---|---|---|
| Breakfast | Replenish energy after the overnight fast | Carbohydrates + protein + light fats | Bread with honey, yogurt, fruit, coffee |
| Morning Snack | Maintain stable energy levels | Light carbohydrate-based snack | Fresh fruit, dried fruit, yogurt, simple energy bar |
| Lunch | Support training or recovery | Balanced complete meal | Rice or pasta, vegetables, olive oil, lean protein source |
| Pre-Workout (2 hours before) | Provide energy without digestive discomfort | Easily digestible carbohydrates | Banana, bread with jam, or a carbohydrate snack |
| During Training (if >1–2 hours) | Maintain energy and performance | Gels, bars, sports drinks | 1 gel every 40–60 minutes + isotonic drink + optional energy bar |
| Post-Workout (30–70 minutes after) | Replenish glycogen and support muscle recovery | Carbohydrates + protein | Pasta, bread, banana, recovery drink |
| Dinner | Complete recovery and nutritional balance | Balanced complete meal | Meat or fish, carbohydrates, vegetables, olive oil |
| Evening Snack (optional) | Support overnight recovery | Light protein + light carbohydrates | Greek yogurt with nuts or milk with simple biscuits |
Meal distribution should always take into account:
- workout timing
- training intensity
- the athlete’s specific goals.
During periods of heavy training, it is often necessary to increase total energy intake, whereas during recovery or reduced-load phases, a reduction may be appropriate.
The most important factor remains consistency. A well-structured trail runner nutrition plan practiced day after day will always produce better results than occasional nutritional adjustments made only before races.
Common nutrition mistakes in trail running
Even experienced athletes can make nutritional mistakes that gradually limit training quality and race performance.
In many cases, the problem is not a single poor choice, but the accumulation of small habits that progressively impair recovery, energy availability, and the ability to sustain high training volumes.
Understanding the most common mistakes can help prevent them and support the development of a more effective nutrition strategy.
Common errors include:
- frequently training with insufficient energy stores
- underestimating the importance of post-workout recovery
- consuming excessive amounts of sugar within a short period
- neglecting daily hydration
- testing new foods shortly before a race
- copying another athlete’s nutrition strategy without personalization
- completely eliminating specific macronutrients without necessity
- relying exclusively on gels and supplements while neglecting overall dietary quality.
Many of these mistakes arise from the search for quick solutions or the belief that a single nutrition protocol works for everyone. In reality, trail running nutrition is highly individual and should be adapted to each athlete’s characteristics, goals, and needs.
Before making major dietary changes, it is always advisable to evaluate the broader context and ensure that any modifications are consistent with your overall training program.
When to consult a sports nutritionist
As race distances increase and athletic goals become more ambitious, nutrition management also becomes more complex. The needs of an athlete preparing for a 20 km trail race differ significantly from those of someone training for a 100 km race, a 100-mile event, or a multi-day competition.
In these situations, personalized planning can make a substantial difference both in training quality and race execution.
Professional support may be particularly beneficial when:
- preparing for long-distance races
- experiencing frequent gastrointestinal issues
- struggling with slow recovery
- aiming to optimize body composition
- facing periods of particularly demanding training
- developing race-specific nutrition strategies.
Professional guidance allows athletes to build a truly personalized plan while avoiding common mistakes and adapting nutrition to their individual requirements.
If you want to improve your nutrition and develop a strategy tailored to both training and competition, you can rely on the PERSONALIZED NUTRITION PLANS developed by TRM coaches. Each program is created according to the athlete’s individual characteristics, seasonal goals, and sport-specific demands to provide optimal support for both preparation and performance.
Conclusion
Proper nutrition n trail running is one of the most effective tools available for improving training quality, supporting recovery, and performing more effectively during competitions.
There are no magic formulas or universal strategies that work for everyone. Each athlete must learn to understand their own body, test different approaches during training, and gradually build a nutrition strategy that aligns with their goals.
The most important thing to remember is that nutrition is not only about race day. It is about the daily choices that support long-term athletic development. Just like training itself, effective trail runner nutrition delivers its benefits through consistency and commitment over time.
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Do You Want to Improve Your Trail Running Nutrition and Approach Training with More Energy and Consistency?
Take a look at our TRM NUTRITION PLAN programs
or download our free guide: THE COMPLETE GUIDE FOR SPORT AND NUTITION SUPPLEMENTATION
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Frequently Asked Questions (FAQ)
1. How many carbohydrates should a trail runner consume each day?
Carbohydrates are the primary energy source for trail runners and generally account for approximately 65–70% of total daily calorie intake.
However, this percentage is not fixed. It tends to decrease during recovery periods and increase significantly during heavy training blocks or in preparation for long runs. The most important factor is not achieving an exact percentage, but adapting nutrition to training demands.
2. How should nutrition in trail running change on rest days?
On days with little or no training, overall energy requirements decrease, and carbohydrate intake may drop to approximately 55% of total calories.
This does not necessarily mean eating less overall, but rather adjusting food choices to support recovery while avoiding unnecessary caloric excess.
3. What is the best thing to eat before a trail running workout?
The objective before training is simple: start with adequate energy availability without creating digestive discomfort.
If there is enough time before training, a balanced meal may be appropriate. If the session is closer, lighter carbohydrate-rich snacks such as bananas, bread with jam, or small energy bars are often effective.
4. How should nutrition in trail running be managed during a long trail run?
Once exercise exceeds one or two hours, nutrition becomes part of performance itself rather than simple supplementation.
Energy gels, bars, sports drinks, and small solid foods can help maintain stable energy levels and reduce the risk of sudden performance declines.
5. How often should you eat during a long run?
There is no universal rule, but consuming energy every 30–60 minutes provides a good starting point.
The ideal frequency and quantity should be tested during training because each athlete responds differently, and successful race nutrition strategies are built through experience.
6. How important is post-workout recovery nutrition?
Recovery is often underestimated, yet it is one of the most important phases of the training process.
During the 30–70 minutes following exercise, the body is particularly receptive to carbohydrates and protein needed to replenish energy stores and initiate muscle repair. Managing this phase effectively improves the quality of future workouts.
7. Are proteins really that important for trail runners?
Absolutely. Trail running is not only an endurance sport but also places significant stress on the muscular system, particularly during downhill running.
Protein supports both recovery and training adaptations. For most athletes, an intake of approximately 1.5 g per kilogram of body weight is sufficient when included as part of a balanced diet.
8. Does BCAA supplementation make sense for trail runners?
BCAA supplementation may be useful in specific situations, but it is not a universal solution.
Any supplementation strategy should be evaluated based on the athlete’s goals, workload, and individual needs. Personalized planning is generally preferable to standardized approaches.
9. Does body weight really affect performance?
Yes, but it should never be viewed in isolation.
Excess body fat can increase energy expenditure and make running more demanding, particularly on technical terrain and descents. However, the objective should never be extreme weight loss but rather achieving a healthy balance between body composition, health, and performance.
10. When is it worth working with a coach or nutritionist?
Professional guidance can be especially valuable when preparing for ultra trail events, 100 km races, 100-mile races, or when seeking significant improvements in performance management.
A personalized strategy helps avoid common mistakes and provides a sustainable long-term approach to both nutrition and performance.
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