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What to Eat Before, During, and After a Run

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You do not need a complicated nutrition plan to become a better runner.

You probably do not need a shelf full of supplements either.

For most runners, nutrition around training comes down to a few simple questions:

What am I doing today?

How long will I be running?

How hard will I be running?

When do I need to perform again?

The answers determine how much attention you need to pay to what you eat before, during and after your run.

A 30-minute easy run does not require the same nutrition strategy as a two-hour long run.

A hard interval session is different from an easy recovery jog.

And race day is different from both.

Carbohydrate is particularly important because it provides a major fuel source during moderate and high-intensity endurance exercise. Protein becomes particularly important for recovery and tissue repair. Fluid and electrolytes matter according to how much you sweat and how long you exercise.

The goal is not to make every run a nutrition project.

It is to give your body what it needs for the session in front of you.

Before the Run

The purpose of eating before a run is fairly simple.

You want to start adequately fueled and hydrated without putting your stomach under unnecessary stress.

What you eat, and how much, depends largely on the session.

Easy Short Runs

If you are heading out for an easy 30 to 45-minute run, you usually do not need a special pre-run meal.

If you have eaten normally during the day and are not hungry, you can generally run without eating immediately beforehand.

This is particularly true for an easy session rather than a demanding workout.

If you are hungry, however, there is no reason to avoid food simply because the run is short.

A banana, toast, cereal, yogurt, fruit or another familiar snack can be perfectly reasonable.

The key is comfort.

There is limited evidence that deliberately exercising in a fasted state provides a meaningful long-term performance advantage for endurance athletes, while carbohydrate consumed before longer exercise can improve performance.

So there is no need to turn every easy morning run into a fasted-training experiment.

Eat if you need to.

Do not eat simply because a nutrition rule tells you that you must.

Long Runs

The longer the run, the more useful pre-run carbohydrate becomes.

Muscle and liver glycogen are important sources of carbohydrate during endurance exercise. Starting a long run with adequate carbohydrate availability can help delay the point at which carbohydrate availability becomes limiting.

Research has found that consuming carbohydrate in the hours before prolonged endurance exercise can improve subsequent endurance performance.

For a long run, a carbohydrate-rich meal several hours beforehand is a practical approach.

That could be:

• Oats with banana and honey
• Toast with jam and yogurt
• Rice with a light protein source
• Cereal with milk and fruit
• A bagel with banana
• Potatoes with a small amount of protein

You do not need to find a magical "runner's breakfast."

You need food that provides carbohydrate, sits comfortably in your stomach and is familiar to you.

The closer you get to the run, the smaller and simpler the meal usually needs to be.

A large, high-fat meal immediately before running is unlikely to be comfortable for many people because fat slows gastric emptying.

High-fibre foods can also cause gastrointestinal problems for some runners when consumed close to exercise.

This is why your normal healthy diet and your immediate pre-run meal do not necessarily look identical.

A large salad might be a great lunch.

It might not be the best meal 30 minutes before a long run.

Hard Workouts

Hard workouts require more from your body than easy running.

Intervals, threshold sessions and race-pace workouts depend heavily on carbohydrate availability.

This makes eating before these sessions particularly useful.

If you are training in the morning, you do not need to eat an enormous breakfast.

A smaller carbohydrate-rich snack may be enough if you ate a normal dinner the night before.

If you have several hours before the workout, you can have a more substantial meal.

The amount should reflect your individual needs, body size, timing and tolerance.

One important point is that the old fear of eating carbohydrate shortly before exercise causing a "sugar crash" is not supported by the evidence as a universal phenomenon. A review of pre-exercise carbohydrate feeding found that the risk of impaired performance from carbohydrate consumed 30 to 60 minutes before exercise appears to be minimal for most people.

So if a banana or sports drink before your workout works for you, there is no scientific reason to avoid it because you are worried about an automatic blood sugar crash.

Race Day

Race-day nutrition should not be experimental.

This is probably the most important nutrition rule a runner can follow.

If you have never eaten a particular gel before, race morning is not the time to try it.

If you normally eat toast and banana before long runs, there is little reason to replace that breakfast with something completely different because you are racing.

The days before a long race also matter.

For endurance events lasting around 90 minutes or longer, increasing carbohydrate intake in the days before competition can increase muscle glycogen and improve endurance performance.

This is the basic idea behind carbohydrate loading.

It is most relevant to longer races, particularly the half marathon and marathon, rather than a short easy event.

Race morning should then be about topping up carbohydrate availability without creating gastrointestinal problems.

Keep it familiar.

Keep it simple.

And give yourself enough time to digest it.

During the Run

The question during a run is not always "What should I eat?"

Sometimes the answer is nothing.

The need for carbohydrate during exercise increases with duration and intensity.

Easy Short Runs

For an easy run lasting less than about an hour, you generally do not need to consume carbohydrate during the run.

Water may be useful depending on the weather, your sweat rate and personal preference.

The American College of Sports Medicine notes that during exercise lasting less than one hour, there is little evidence of meaningful performance differences between consuming a carbohydrate-electrolyte drink and plain water.

So you do not need a gel for every 5K.

Your body already has stored fuel.

The purpose of eating during a run is to support performance and extend your ability to exercise, not to make nutrition part of every workout.

Long Runs

Long runs are different.

Once exercise becomes prolonged, carbohydrate intake can help maintain blood glucose availability and delay fatigue.

A commonly supported target for prolonged endurance exercise is around 30 to 60 g ofcarbohydrate per hour .

More recent research supports the performance benefit of carbohydrate during endurance exercise and suggests that the benefit becomes more pronounced as exercise duration increases.

For a runner, this could come from:

• Gels
• Sports drinks
• Chews
• Bananas
• Raisins
• Honey
• Other easily digested carbohydrate foods

You do not have to use gels.

Research comparing food and sports products has not shown a consistent performance advantage for one carbohydrate source over another when appropriate amounts can be consumed and tolerated.

The practical limitation is convenience.

A gel contains a concentrated amount of carbohydrate in a small package.

A banana does not.

That is why gels are popular.

Your long runs are the place to find out what works for you.

Hard Workouts

Most hard workouts do not require carbohydrate during the session if they are relatively short.

A 45-minute interval workout is very different from a two-hour progression run.

If you have eaten adequately beforehand, your stored carbohydrate is generally sufficient for a shorter quality session.

But if the workout is long, particularly if it includes substantial running at moderate or high intensity, carbohydrate during the session can become useful.

The longer the workout lasts, the more relevant it becomes.

This is one reason the nutrition strategy should match the workout rather than simply following a fixed rule.

Hydration During the Run

Nutrition and hydration are related, but they are not the same problem.

Your fluid needs depend heavily on how much you sweat.

Sweat rate varies between individuals and changes with temperature, humidity, clothing, pace and duration.

The American College of Sports Medicine recommends individualized fluid replacement rather than a single universal drinking volume.

For a short run in mild conditions, you may not need to carry water.

For a long run in hot weather, you probably need a plan.

And if you are a heavy sweater running in high heat, sodium may become relevant alongside fluid.

The important thing is to avoid both extremes.

Arriving dehydrated is not ideal.

Drinking far more than you need is not ideal either.

Your goal is to manage fluid losses, not eliminate every gram of body-mass change.

After the Run

Post-run nutrition has two main jobs.

Replace what you used.

Provide the materials needed for recovery.

Carbohydrate helps restore glycogen.

Protein provides amino acids needed for muscle protein synthesis and tissue remodeling.

Fluid and electrolytes help restore what was lost through sweat.

How urgently you need to do this depends on what happens next.

After an Easy Short Run

You do not need to sprint home and drink a recovery shake within 30 minutes of finishing a 30-minute easy run.

If you are eating normally, your next regular meal can usually take care of recovery.

For example:

Breakfast after a morning run could be oats with milk and fruit.

Lunch could be rice, dal and vegetables with a protein source.

Dinner could be potatoes or rice with fish, chicken, tofu or another protein source.

The important thing is your overall diet.

Recovery does not begin and end with a post-run drink.

After a Long Run

After a long run, recovery nutrition becomes more important.

You have used more carbohydrate.

You have created more muscle stress.

You may have lost substantial fluid.

And you may have another important workout coming within the next day or two.

A meal containing carbohydrate and protein is a practical choice.

For runners with a short recovery window, carbohydrate intake becomes particularly important because rapid glycogen restoration may be necessary.

Research on endurance recovery suggests that when the recovery window is short, carbohydrate intake combined with protein can support glycogen restoration and muscle protein synthesis.

If you have a full day or more before your next demanding session, there is less urgency.

You can simply focus on eating enough across the day.

How Much Protein?

You do not need an enormous amount of protein immediately after every run.

A review of endurance recovery nutrition suggests approximately 0.25 g/kg of protein per meal as a practical amount for supporting muscle protein synthesis during recovery.

The International Society of Sports Nutrition similarly describes approximately 20 to 40 g of high-quality protein per serving as a useful general range for athletes, depending on body size and other factors.

The bigger point is consistency.

Protein should be distributed across the day rather than concentrated entirely into one post-run meal.

For most runners, normal foods are enough.

Eggs.

Milk.

Yogurt.

Chicken.

Fish.

Soy.

Tofu.

Dal and other legumes.

You do not need a supplement if you can comfortably meet your needs through food.

The Difference Between Training and Racing

This is perhaps the simplest way to think about running nutrition.

Training nutrition supports the workout.

Race nutrition supports performance.

That means you do not necessarily need to fuel every training run as aggressively as you would fuel a marathon.

There is value in doing some easy runs without carbohydrate during the session.

There is also value in practising race fueling during long runs.

You need both.

Your training should prepare your body for the race, but it should also prepare your stomach.

If your marathon plan calls for 60 g of carbohydrate per hour, your long runs should give you opportunities to practise consuming that amount.

If your race is in hot conditions, practise your hydration strategy in similar weather.

If you are planning to use gels, find out which ones you tolerate before race day.

Research specifically recommends trialling carbohydrate sources during training before implementing them in competition because gastrointestinal tolerance varies between athletes.

Your long run is your dress rehearsal.

Race day is not.

A Simple Framework

You can reduce most running nutrition decisions to a simple framework.

Easy short run

Before: Normal meals. Eat a snack if hungry.

During: Usually nothing. Water according to conditions and thirst.

After: Normal meal.

Long run

Before: Carbohydrate-rich meal or snack.

During: Consider 30 to 60 g carbohydrate per hour for prolonged runs. Practise your race strategy.

After: Carbohydrate, protein and appropriate fluid replacement.

Hard workout

Before: Arrive adequately fueled, particularly with carbohydrate.

During: Usually unnecessary for shorter sessions. Consider carbohydrate if the workout is prolonged.

After: Normal meal containing carbohydrate and protein.

Race day

Before: Familiar carbohydrate-rich breakfast and appropriate hydration.

During: Use the strategy you practised in training. For prolonged endurance events, carbohydrate intake becomes important.

After: Replace carbohydrate, protein and fluids, particularly if another event or hard session is coming soon.

You Do Not Need to Eat Like a Professional Athlete

Running nutrition can become unnecessarily complicated.

You can spend hours calculating carbohydrate percentages, buying supplements and trying to optimize every meal.

Most runners do not need that.

Start with the fundamentals.

Eat enough.

Get enough carbohydrate to support your training.

Consume protein regularly.

Start well hydrated.

Fuel longer and harder sessions more deliberately.

Practise your race nutrition before race day.

And choose foods you actually tolerate and enjoy.

The biggest mistake is not failing to find the perfect gel.

It is under-fueling the training you are asking your body to perform.

An easy 30-minute run does not need the same strategy as a two-hour long run.

A marathon does not need to be fueled like an easy Tuesday morning.

The best nutrition plan is therefore not the most complicated one.

It is the one that matches the demands of the run.

Before, give your body what it needs to start.

During, replace what the session is using.

After, give your body what it needs to recover.

Then do it again tomorrow.

That is sports nutrition in its most useful form.

References

1. Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. Journal of the Academy of Nutrition and Dietetics.
2. Jeukendrup, A. E. (2014). A Step Towards Personalized Sports Nutrition: Carbohydrate Intake During Exercise. Sports Medicine.
3. Jeukendrup, A. E. (2011). Nutrition for endurance sports: Marathon, triathlon, and road cycling. Journal of Sports Sciences.
4. Stellingwerff, T., & Cox, G. R. (2014). Systematic review: Carbohydrate supplementation on exercise performance or capacity of varying durations. Applied Physiology, Nutrition, and Metabolism.
5. Ramos-Campo, D. J., et al. (2024). The Ergogenic Effects of Acute Carbohydrate Feeding on Endurance Performance: A Systematic Review, Meta-analysis and Meta-regression. Critical Reviews in Food Science and Nutrition.
6. Beelen, M., Burke, L. M., Gibala, M. J., & van Loon, L. J. C. (2015). Nutrition to Support Recovery from Endurance Exercise: Optimal Carbohydrate and Protein Replacement. International Journal of Sport Nutrition and Exercise Metabolism.
7. Jäger, R., et al. (2017). International Society of Sports Nutrition Position Stand: Protein and Exercise. Journal of the International Society of Sports Nutrition.
8. Sawka, M. N., et al. (2007). American College of Sports Medicine Position Stand: Exercise and Fluid Replacement. Medicine & Science in Sports & Exercise.
9. Ormsbee, M. J., et al. (2014). Pre-exercise Nutrition: The Role of Macronutrients, Modified Starches and Supplements on Metabolism and Endurance Performance. Nutrients.
10. McCubbin, A. J., et al. (2022). A Food First Approach to Carbohydrate Supplementation in Endurance Exercise: A Systematic Review. Sports Medicine.
11. Jeukendrup, A. E. (2011). The Myths Surrounding Pre-exercise Carbohydrate Feeding. Annals of Nutrition and Metabolism.
12. Jeukendrup, A. E. (2017). Training the Gut for Athletes. Sports Medicine.