What to Eat Before a Half Marathon: Your Guide to Starting Fully Fueled

Marathon nutrition gets plenty of attention, but what about lining up for a half marathon? After months of training, in the cold, the heat or even with a more relaxed plan, 21.1 km deserves to be taken seriously. It may look less intimidating than a marathon on paper, but it is still a demanding effort. What you eat in the days beforehand can help you finish strongly, whether you are chasing a fast time or simply aiming to reach the finish line. Nutrition matters throughout your training, but it becomes even more important as race day approaches: your muscles need to be topped up with energy so they can hold your pace to the end. Nothing too complicated, provided you make the right adjustments at the right time. The night-before meal, breakfast, mistakes to avoid: Marathons explains, with the research to back it up, how to fuel properly before your half marathon.

Why nutrition matters on the half marathon too

In a half marathon, as in most endurance events, your main fuel is glycogen. This is the form in which your muscles store carbohydrates, and it is what allows you to sustain a hard pace for a long time. The problem is that even if Eliud spent years insisting that “no human is limited”, his glycogen stores are very much limited. That is why you often hear about carb loading before a race. The fuller those stores are at the start, the more room you have to hold your pace all the way to the finish.

The whole question comes down to one number: 90 minutes. That is the effort duration used as a benchmark in the leading sports nutrition guidelines, published in 2016 by the American College of Sports Medicine, the Academy of Nutrition and Dietetics and Dietitians of Canada.

Target time	Recommended carbohydrate intake	Time frame
Under 1:30	7–12 g per kilogram of body weight per day	The 24 hours before the race
Over 1:30	10–12 g per kilogram per day	The 36–48 hours before the race

The half marathon sits right on that boundary. The best runners finish in just over an hour, while a large proportion of recreational runners take well over 1:30, sometimes more than two hours. In other words, your target time largely determines the strategy you should use.

And as the table above shows, this is not just about performance. The fastest runners do not actually need to push carb loading very hard because their effort lasts barely an hour. It is a different story for recreational runners, whose race can last several hours. Starting with half-empty stores is an invitation to hit the wall in the final kilometres. Yes, even in a half marathon, the wall is more than a myth. The longer the effort, the greater the risk of blowing up. Eating properly before a half marathon is therefore not just about your time. It is about making it to the finish, full stop.

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What to eat before a half marathon, from the night-before meal to breakfast, plus the mistakes to avoid for a strong race.

Two days to go: fuel up without stuffing yourself

Your half marathon is approaching. Time to top up. That does not mean eating twice as much. The final phase of training also includes the taper, when training volume drops and so does your energy expenditure. The idea is simply to increase the proportion of carbohydrates in each meal, at the expense of fats and very high-fibre foods.

Take a 70 kg runner targeting just under two hours. According to the recommendations, they should aim for 700 to 840 g of carbohydrates per day during the 36 to 48 hours before the race. That may look intimidating on paper. No need to panic: nobody is asking you to pile your plate high at every meal. The goal is certainly not to feel sick from the amount of food you have eaten. To make carb loading easier, spread your carbohydrates throughout the day: bread, rice, potatoes, cereal, fruit, applesauce, fruit juice...

If you are targeting under 1:30, you do not need an aggressive carb load. A carbohydrate-rich diet during the 24 hours before the race is enough.

A few pointers to get there without forcing it:

Add carbohydrates to every meal and snack instead of relying on one enormous dinner the night before. The traditional pasta party is not necessarily your best friend.
Consider “liquid” carbohydrates such as fruit juice, squash or a sports drink. They are easier to consume and sit lightly in the stomach. Just do not overdo it.
Gradually reduce fibre from two days out, especially raw vegetables and legumes, to limit digestive discomfort on race day.
Do not overlook the two-days-out mark. It is often forgotten, even though it may be the most important day: glycogen storage takes place over several days, not in one big dinner the night before...

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Gained weight during carb loading? Do not panic

Some runners see their weight rise slightly over these few days, sometimes by as much as 1.5 kg. That is perfectly normal for some people because glycogen stores water as they are replenished. There is no need to stress: your body is simply preparing for the effort ahead. The extra water will be flushed out during the effort.

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The night-before meal: yes to pasta, but do it properly

It is a fixture in every runner’s calendar: the famous pasta party. But the night-before meal should not be a feast. It should be a familiar, easy-to-digest meal eaten early enough not to disrupt your final night of sleep. Ideally, have dinner around 7 p.m. so digestion has time to do its work before you turn in.

Your plate should include:

A generous serving of starchy carbohydrates: Pasta, rice or potatoes to provide most of the carbohydrates.
A serving of protein, enough to satisfy you without weighing you down. Lean meat can be a good option.
Very little fat: Skip the cream, melted cheese and fried foods, which slow digestion.
Very little fibre: Choose a simple tomato sauce rather than a huge pan of vegetables.

Barilla Protein+, a simpler night-before plate

Carbohydrates remain the foundation of a pre-race meal, and Barilla Protein+ has plenty to offer runners. Made with just two ingredients, durum wheat semolina and pea protein, these products retain the carbohydrate content of traditional pasta while providing 20 g of protein per 100 g, all plant-based. They are available as Spaghetti, Penne Rigate and Fusilli, with a bronze-die finish that helps the sauce cling to the pasta.

Per 100 g (uncooked)	Barilla Protein+
Energy	354 kcal
Carbohydrates	63 g
Protein	20 g
Fat	1.7 g
Fibre	3.1 g

What matters the night before a half marathon is straightforward: plenty of carbohydrates, little fat and little fibre. Those are the priorities. Since the protein is already built into Barilla’s Protein+ range, there is no need to add meat in a rich sauce or a mountain of cheese to balance the plate. Carbohydrates are still king. Protein is there to support them, not replace them.

Our suggestion: Spaghetti or Fusilli Protein+ with homemade tomato sauce, a drizzle of olive oil, a few basil leaves and a little Parmesan. Add some bread and a simple dessert such as applesauce or rice pudding to round out your carbohydrate intake, and you have a proper champion’s meal. Simple and effective.

Race-day breakfast: do not skip it

Your body keeps working overnight, and the liver draws on its glycogen stores to maintain blood glucose. Breakfast is therefore not something to overlook. It helps top those stores back up before the start. The recommendations call for 1 to 4 g of carbohydrates per kilogram of body weight, consumed 1 to 4 hours before the race. The principle is simple: the earlier you eat, the more substantial the meal can be. As the start gets closer, keep it lighter.

For an 8 a.m. start, that means breakfast around 5:00 to 5:30 a.m. Yes, getting up hurts a little, but your stomach will thank you at mile 9. That much is certain.

Breakfast example for a 70 kg runner, eaten 2½ to 3 hours before the start

Slices of bread with honey or jam
A banana
Applesauce
A glass of fruit juice
A hot drink such as tea or coffee

No unnecessary extras, just simple foods you regularly eat and have already used before long runs.

Hydration

Food gets most of the attention, but hydration matters too. There is no need to down a litre bottle as soon as you wake up. The recommendations suggest 5 to 10 ml per kilogram of body weight during the 2 to 4 hours before exercise, or 350 to 700 ml for a 70 kg runner. That window gives your body time to get rid of any excess before the start. Anyone familiar with the start corrals knows the drill: as the excitement builds, bathroom breaks are inevitable...

Is coffee compulsory?

If you usually drink it, there is no reason to stop. Caffeine also has a well-documented effect on endurance performance, with effective doses in the region of 3 to 6 mg per kilogram, taken about an hour before exercise. It can also speed up gut motility in some runners, however. And if you never drink coffee, race morning is probably not the best time to start.

Mistakes to avoid

Trying a new food on race day. This is the golden rule. A new gel, a new drink, a “pro-style” breakfast spotted on social media: anything you have not tested beforehand stays in the cupboard. The same goes for products handed out on race day.
Turning the night before into an all-you-can-eat pasta party. Do not put all your faith in one meal; glycogen is stored over several days. An oversized dinner guarantees a restless night and a heavy stomach in the morning.
Extending the feast into Sunday morning. On race day, choose a light but sufficiently substantial breakfast. Avoid foods that take a long time to digest.
Overdoing the fibre. Lentils, chickpeas, raw vegetables and wholemeal bread: excellent day to day, much less so the day before a race.
Skipping breakfast. With an early start, setting off on 21 km with an empty stomach is asking for the final miles to become a survival exercise. Even if you are about to produce an extraordinary effort, do not pretend you are a superhero. You are a human being with physiological needs. Do not ignore them.
Drinking litres of water just in case. Overhydrating before the start achieves nothing except more trips to the toilet. In extreme cases, excessive water intake can even cause a dangerous drop in blood sodium levels.
Having a drink the night before. Alcohol disrupts sleep, recovery and hydration.

What about after the race?

Once the medal is around your neck, it is time to recover. This will disappoint many people, but no, the open bar is not the best recovery strategy. The basics are the same as before the race, just in different proportions: carbohydrates to replenish your glycogen stores, and protein to rebuild muscle fibres. The recommendations suggest around 0.3 g of protein per kilogram of body weight after exercise, then at every meal. A study on the Seville Marathon also showed that runners significantly underestimated this point...

For anyone who does not want to overthink it, a meal made with Barilla Protein+ on race evening therefore ticks both boxes at once.

Counterintuitive as it may seem, recreational runners have more to gain than elite athletes from taking carb loading seriously for a half marathon. Over 21.1 km, your target time determines the strategy: beyond 1:30, starting with well-stocked carbohydrate reserves can make all the difference between finishing strong and crawling over the line. The golden rule remains the same: never try anything new on race day. It would be a shame to derail months of training because your pre-race nutrition was poorly calibrated!

➜ Find all the information about the Barilla Protein+ range on the official Barilla.com website.