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Diet for runners

What’s the best diet for runners? Nutrition tips and more

This article dives deep into the best diet for runners and how nutrition can enhance your performance, whether you run a mile or a marathon.

This article is based on scientific evidence, written by experts, and fact-checked by experts.
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What’s the best diet for runners? Nutrition tips and more
Last updated on February 2, 2023, and last reviewed by an expert on September 30, 2021.
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Whether you want to reach new levels with your running or just maintain your current routine, you’ll need to focus on your diet.

What’s the best diet for runners? Nutrition tips and more

For all runners, food is fuel.

The types of food you choose to eat can play a major role in your energy levels and performance. They can also help you reduce the chance of having mid-run stomach issues.

Whether you’re an avid marathon runner or prefer a short jog in the neighborhood, knowing the right foods to eat — and when to eat them — is crucial to performing and feeling your best.

This article dives deep into the best diet for runners and how nutrition can enhance your performance.

Nutrition basics for runners

Before you grocery shop for optimal foods for running, it’s important to know the science behind them.

The three macronutrients important for your overall diet are:

Along with this, eating a diverse diet will ensure you’re also obtaining micronutrients and antioxidants, which play a key role in muscle function and recovery.


Carbohydrates are the body’s main energy source and are critical for long-distance running.

When you consume them, your body breaks down dietary carbohydrates into their simplest form, the sugar glucose.

Glucose is a vital energy source for humans. This is because your body needs it to produce the energy currency of your cells, called adenosine triphosphate (ATP).

During a run or exercise, your body may send glucose to muscle cells as an immediate source of energy. Any additional glucose in your bloodstream is sent to the liver and muscle cells to be stored as glycogen.

During a run, your body initially pulls glucose from the blood to power working muscles. As levels of glucose begin to dip, the body begins to convert stored glycogen back into glucose through a process called glycogenolysis.

Your VO2max is the maximum rate at which your body can use oxygen during exercise, and it increases with higher intensity exercise.

This limits the oxygen available for energy production. As a result, your body turns to anaerobic (absence of oxygen) energy production, which mainly relies on carbohydrates.

What to eat before running
Suggested read: What to eat before running

As your exercise intensity increases, such as in shorter distance runs and sprints, your body uses carbohydrates as a primary fuel source and fat as a secondary source.

Due to the shorter time duration of a sprint, most people will have adequate blood glucose and glycogen stores to support their run.

During lower intensity longer runs, your body increasingly relies on fat stores to produce energy. This might happen with runs greater than 6 miles (10 km), for example.

Along with this, most long-distance runners will also need to refuel with simple sugars to sustain their run. That’s why many long-distance runners consume sports beverages or energy gel.

Consuming about 45–65% of total daily calories from carbohydrates is a good goal for most runners.


Stored body fat is another excellent fuel source, especially during long-distance running.

Generally, you should aim to get between 20–30% of your total daily calories from mostly unsaturated fats. Avoid eating less than 20% of your calorie intake from fat.

A low fat intake is linked with deficiencies in fat-soluble vitamins and essential fatty acids.

During long-lasting endurance exercise, your body turns to its fat stores as a primary source of energy.

This happens through a process called fat oxidation. It involves breaking down stored triglycerides into fatty acids, which your body then converts into glucose.

Suggested read: Pre-workout nutrition: What to eat before a workout

While the process of fat oxidation is useful in long-distance running, it’s less efficient during high-intensity exercise than using carbohydrates. That’s because fat takes extra time to be converted into energy, and this process also requires oxygen.

Furthermore, dietary fat is less efficient as a workout fuel than carbohydrates, which are used very quickly and are more readily available during exercise.

So, instead of consuming fat specifically to power your running, you may want to eat it as part of a balanced diet to support your body’s functions.

Dietary fat is crucial for:

It also supports the absorption of fat-soluble vitamins (A, D, E, and K), making it a crucial component of your diet.

If you experience stomach upset, you may want to consume lower-fat meals a few hours before a run. Instead, aim to consume higher-fat meals during recovery hours.


Protein is not a primary fuel source during endurance exercise. Instead, your body uses it to support:

Your muscles break down as you run, which makes refueling with protein important for rebuilding that muscle. Without protein, the muscles are unable to rebuild efficiently, which can lead to muscle wasting, an increased risk of injury, and poorer performance.

Though individual needs vary, most research suggests consuming around 0.6–0.9 grams of protein per pound (1.4–2.0 grams per kg) of your body weight per day.

This is sufficient for recovery and may help prevent muscle loss in extreme endurance athletes.


Exercise stresses your body’s metabolic pathways, so you’ll need a diet rich in micronutrients to support their function.

Suggested read: Post-workout nutrition: What to eat after a workout

While each athlete will have different needs, some micronutrients are especially important:

For most people, consuming a diet full of a variety of whole foods will ensure you’re getting enough micronutrients.

If you believe you may have a deficiency or want to try a new supplement, speak with a healthcare professional.

Summary: Carbohydrates are your body’s main source of energy during exercise. As you increase the distance and time of your runs, your body will also begin to use stored fat as fuel. Prioritizing your nutrition can help improve your performance.


Timing your eating well may make all the difference to your runs. Your timing will largely depend on:

The best way to find what works for you is through trial and error.

Pre-run nutrition

Most people who run for fewer than 60 minutes can safely exercise without eating beforehand. Still, you might want to have a small, carbohydrate-rich snack to provide a quick source of glucose. Examples include:

If you plan on running for longer than 60–90 minutes, you’re going to want to have a small meal or snack that contains around 15–75 grams of carbohydrates at least 1–3 hours before your workout.

Suggested read: What to eat before a morning workout: Weight loss and more

This will give your body enough time to digest your food.

Examples of carbs to eat include:

You may want to avoid high fiber foods a few hours before a run because they take longer to digest and can lead to stomach upset during exercise. Examples include whole grains, beans, lentils, and some vegetables.

Finally, people who run longer than 90 minutes may wish to carb load a few days before an event.

This involves eating a large number of carbohydrates before a long-distance run to make sure your body is storing as much glycogen as possible to supply quick energy.

During carb loading, many people will aim to eat 3.2–4.5 grams of carbs per pound (7–10 grams per kilogram) of their body weight per day, 36–48 hours before their run. The best sources are complex carbohydrates, such as:

During your run

The only macronutrient you need to focus on during a run is carbohydrates. What you consume should largely depend on the length and intensity of your run.

Here are general guidelines you can follow for different run lengths:


Whether you eat right after a run will depend on the intensity of the exercise, how long you ran, and your personal preferences.

8 healthy drinks rich in electrolytes
Suggested read: 8 healthy drinks rich in electrolytes

If you want to eat right away, try a small snack containing carbohydrates and protein, such as chocolate milk or an energy bar.

Within 2 hours after your run, try to have a meal that provides plenty of carbohydrates and protein.

Aim to get between 20–30 grams of protein. Research has shown this may promote increased muscle protein synthesis.

Some examples of protein-rich foods include:

You’ll also want to replenish your glycogen stores by eating complex carbohydrates, such as whole-wheat pasta, potatoes, brown rice, and whole-grain bread, which will provide a steady source of glucose for hours after your run.

Summary: In most cases, the foods you eat before, during, and after your run will depend on many personal factors. Try a few of these pointers and tweak them as necessary to figure out what works best for you.

Other diet tips for runners

If you’re looking to improve your performance, here are some diet tips that might help:

Summary: Eating enough, listening to your body, trial, and error, staying hydrated, and several other tips may help improve your running.

The bottom line

The foods you eat play a major role in your running performance.

Suggested read: Carb cycling: Overview, benefits, example menu, and tips

Depending on your personal and performance goals, the length of your run, and your level of experience, you’ll need to make sure you’re eating the right foods to help you run your best.

Since each runner is different, you may need to practice trial and error to see which foods and other diet factors work best for you.

Just taking a look at your nutrition habits may make all the difference.

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