What to Eat Before a Half Marathon

A half marathon is long enough for fuelling to matter.

It is not a marathon, and you do not need an extreme race-week routine. But 13.1 miles, or 21.1 km, is far enough that poor timing, skipped breakfast, untested gels or panic drinking can make the final miles feel far harder than they should.

The aim is simple: start fuelled, comfortable and calm, then take in enough carbohydrate and fluid to support the effort.

You do not need the perfect plan. You need one you have practised.

The simple answer: what to eat before a half marathon

Before a half marathon, build your plan around carbohydrates your stomach already trusts.

That means steady carbohydrate-based meals in the final day or two, a race-morning breakfast you have practised, and a during-race fuel plan if you expect to be out for around 90 minutes or more.

The foods do not need to be dramatic. They need to be repeatable.

Think along these lines:

• Porridge with banana or honey
• Toast, crumpets or a bagel with jam
• Cereal with milk or a familiar plant milk
• Rice, pasta, potatoes or noodles with a protein food
• Rice cakes with jam or honey
• Banana
• Malt loaf
• Sports drink, if solids are difficult
• Gels or chews, if you have practised them

Carbohydrate matters because it is stored as glycogen in your muscles and liver. As the race goes on, especially if you are working hard, carbohydrate availability becomes more important. If you start low or do not fuel during a longer effort, the later miles can feel heavy, flat and strangely emotional.

You do not need to eat everything in sight. You need enough easy-to-digest carbohydrate, at the right time, in a form you know works.

The job of food before a half marathon is not to make you feel full. It is to help you start steady and finish with something left.

For a wider guide to everyday run fuelling, read RunFuel's guide on what to eat before and after running.

Why half-marathon fuelling matters

A half marathon is different from a 10K because duration starts to change the job.

For many runners, a 10K is over before during-run fuel becomes a big factor. A half marathon usually lasts long enough for carbohydrate stores, hydration, gut comfort and pacing to all meet each other.

That does not mean you should copy marathon advice exactly.

The half marathon sits in the middle:

• Long enough that stored carbohydrate can become limiting
• Short enough that most runners do not need a huge marathon-style carbohydrate plan
• Fast enough that high-fat or high-fibre foods close to the start can cause problems
• Long enough that practising gels, chews or sports drink is worth doing

Runners usually come unstuck in one of three ways:

• They eat too little because they are worried about feeling heavy.
• They wait until they already feel empty before taking fuel.
• They try a new breakfast, gel or sports drink on race day.

Good half-marathon fuelling is not complicated. It is just less optional than it was for 5K or 10K.

How finish time changes your half-marathon fuel plan

Finish time matters because a 75-minute half marathon and a 2.5-hour half marathon are different fuelling problems.

The distance is the same. The time on feet is not.

Use this as a starting point:

Under 90 minutes

If you expect to finish under 90 minutes, you may race well with a solid race-week routine, breakfast and a small amount of carbohydrate around the start.

Fuel is still useful for some runners. A small carbohydrate option before the start, a carbohydrate mouth rinse, sports drink or one gel during the race can help if you have practised it. Under 90 minutes often means less fuel, not necessarily no fuel.

90-120 minutes

This is the classic half-marathon fuelling zone.

Most runners in this range benefit from planned carbohydrate during the race. A practical range is around 30-60 g carbohydrate per hour, but treat it as something to practise rather than a target you must hit perfectly.

For a 90-minute half marathon, that may simply mean one or two gels total, depending on breakfast and tolerance. For a longer 2-hour effort, you may need a more regular plan. It could also mean sports drink, chews, or a mix of smaller options.

2-3 hours or run-walk

If you expect to be out for 2-3 hours, fuelling and hydration deserve more attention.

You are moving for longer, often through changing weather, course stations, walk breaks and nerves. A plan can help you avoid feeling empty, dizzy, nauseous or overwhelmed late on.

For many first-time half marathoners, the goal is not an aggressive carbohydrate target. It is a routine you can actually follow:

• Breakfast you can digest
• Fuel you can carry
• Water or sports drink you know how to use
• A first carbohydrate option before you feel desperate
• Nothing brand new on race day

What to eat in the week before a half marathon

Race-week nutrition should feel calm.

The goal is to arrive rested, fuelled and comfortable. This is not the week to overhaul your diet, cut out food groups, add a new supplement routine or suddenly decide your body loves bran cereal.

3-4 days before

Three to four days before the race, keep your meals familiar.

You do not need to eat only plain beige food for four days. You also do not need to make every meal a pasta party. Just make sure your meals include carbohydrate and enough total food to support taper week.

You might build meals around:

• Rice bowl with chicken, tofu, eggs or beans if they sit well
• Pasta with tomato sauce and a protein food
• Jacket potato with tuna, cheese, beans or hummus if those toppings suit you
• Noodles with tofu, prawns, chicken or eggs
• Porridge, cereal or toast at breakfast
• Sandwiches, wraps or bagels at lunch
• Soup with bread

If you are reducing training volume, your appetite may shift. That is normal. Do not use taper week as a reason to under-eat. The race still needs fuel.

24-48 hours before

In the final 24-48 hours, many runners benefit from increasing easy-to-digest carbohydrate, especially if they expect to race for over 90 minutes.

This can look very normal:

• Add toast, bagels or cereal at breakfast.
• Choose rice, pasta, potatoes, noodles or bread at meals.
• Use lower-fibre carbohydrate options if your stomach is sensitive.
• Add a carbohydrate snack between meals if needed.
• Use smoothies or fruit juice if solid food feels difficult and you know they sit well.

You are not trying to feel stuffed. You are trying not to start low.

If high-fibre foods make your stomach unpredictable, reduce the very heavy fibre load in the final day or two. That might mean less bran cereal, fewer large salads, smaller portions of beans and lentils, and more simple carbohydrate choices such as rice, pasta, potatoes, toast or bagels.

What not to change in race week

Race week is not the time to test your curiosity.

Avoid:

• New gels, chews or drinks
• New caffeine routines
• New supplements
• A sudden high-fibre diet
• A sudden low-carbohydrate diet
• Very large portions if you are not used to them
• Unfamiliar takeaway
• Alcohol-heavy meals
• New "race week" foods you only bought because someone online mentioned them

If you have not tested it before a long run, be careful about putting it into race week.

Do you need extra carbs before a half marathon?

Often yes, but not always as a strict carb-load.

Carbohydrate-focused eating becomes more relevant for events lasting around 90 minutes or more. Many half marathon runners fall into that range, so increasing carbohydrate in the final 24-48 hours can help.

That does not mean every runner needs a strict marathon-style carb-load.

Think of it as a carbohydrate-centred race build:

• Keep meals familiar.
• Include carbohydrate at each meal.
• Add simple carbohydrate snacks if needed.
• Reduce very high-fibre foods if your stomach is sensitive.
• Avoid arriving under-fuelled because you were worried about feeling heavy.

Useful carbohydrate foods include rice, pasta, potatoes, bread, bagels, toast, crumpets, oats, cereal, noodles, rice cakes, malt loaf, bananas, smoothies or juice if you tolerate them.

For a faster runner expecting to finish well under 90 minutes, a full carb-load may be unnecessary. For a 2-hour runner, first-time half marathoner or anyone who fades badly late on, a more deliberate carbohydrate-focused final 24-48 hours can make a real difference.

The best version should still feel normal. You should not arrive at the start line feeling like dinner is still in your chest.

What to eat the day before a half marathon

The day before a half marathon matters more than the night-before dinner alone.

If you eat very little all day, one big pasta bowl at 8 pm will not magically fix everything. Aim for steady meals across the day, with carbohydrate as the base and foods you already trust.

Day-before meals

A simple day-before structure:

• Breakfast: porridge, cereal, toast, bagel or pancakes with familiar toppings
• Lunch: sandwich, wrap, rice bowl, pasta, jacket potato or noodles
• Dinner: familiar carbohydrate-based meal with a protein food
• Fluids: drink steadily with meals and snacks

Day-before meals can be simple:

• Bagel with eggs, yoghurt or a familiar plant yoghurt if tolerated
• Porridge with banana and honey
• Rice bowl with chicken, tofu or eggs
• Pasta with tomato sauce and a protein food
• Jacket potato with tuna, cheese, beans or hummus if those toppings suit you
• Noodles with simple sauce and a protein food
• Sandwich or wrap with fruit and a drink

If you are stomach-sensitive, keep fats and fibre a little lower as the day goes on. That does not mean avoiding vegetables completely. It means not making the day before a half marathon your biggest salad, bean chilli or lentil curry day if those foods often rush through you.

Day-before snack ideas

Snacks can help if nerves reduce your appetite or you struggle to eat enough at meals.

Easy snacks:

• Banana
• Toast with jam or honey
• Bagel with jam
• Rice cakes
• Cereal bar
• Malt loaf
• Small bowl of cereal
• Yoghurt, if it suits you
• Smoothie or juice, if liquids sit well
• Pancakes or crumpets

Do not force snacks if your meals are enough and you feel comfortable. Use them when they solve a real problem.

What to eat the night before a half marathon

The night before a half marathon should be boring in the best way.

Choose a dinner you know sits well: carbohydrate-based, built with a protein food, not too greasy, not too spicy and not wildly different from your usual food.

Reliable dinners before a half marathon

Dinner could be:

• Pasta with tomato sauce and chicken, tuna, tofu or lentils if they sit well
• Rice bowl with chicken, tofu, eggs or prawns
• Jacket potato with tuna, cheese, beans or hummus if those toppings suit you
• Noodles with tofu, chicken, eggs or prawns
• Simple stir-fry with rice or noodles
• Pizza, if you know it suits you and it is not very greasy or huge
• Soup with bread, plus yoghurt or fruit if you need more food
• Wraps with potatoes, rice or bread on the side if needed

You do not need a massive dinner. You need a dinner that helps you sleep and wake up ready to eat breakfast.

Foods to avoid the night before

The main issue is timing, not whether a food is good or bad.

Be cautious with:

• Fried foods
• Very fatty meals
• Creamy sauces
• Very spicy food if you are not used to it
• Huge salads
• Large portions of beans, lentils or pulses if they upset your stomach
• Unfamiliar takeaway
• Excess alcohol
• New desserts, supplements or "race fuel" products

If a food often gives you reflux, bloating, urgency or poor sleep, keep it away from the night-before slot.

Best breakfast before a half marathon

Race-morning breakfast has one job: give you usable energy without causing stomach trouble.

For a half marathon, most runners do better with some carbohydrate before the race. Running a half marathon completely fasted is not ideal for many runners, especially if you are racing, newer to the distance, prone to dizziness, worried about under-fuelling or expecting to be out for a long time.

Practise breakfast before long runs. Race morning should feel familiar.

3-4 hours before

If you have 3-4 hours before the start, you have time for a larger breakfast.

Choose carbohydrate first, with a little protein food if it sits well. Keep fat and fibre moderate if your stomach is sensitive.

Breakfast could be:

• Porridge with banana and honey
• Bagel with jam, honey or a small amount of peanut butter if that works for you
• Toast or crumpets with jam
• Cereal with milk or a familiar plant milk
• Pancakes with syrup, honey or jam
• Rice pudding or creamed rice
• Banana smoothie with oats, if liquids sit well
• Yoghurt with granola, if you know it suits you

If your race starts at 10 am, breakfast at 6.30-7 am may work well. If the race starts earlier, you may need the smaller plan below.

1-2 hours before

One to two hours before a half marathon, go lighter.

This is a good window for a smaller breakfast or snack if you cannot eat earlier.

Try one of these:

• Toast with jam
• Banana
• Crumpet with honey
• Rice cakes with jam
• Cereal bar
• Small bowl of cereal
• Malt loaf
• Sports drink if solids are difficult
• Half a bagel

If nerves are high, the easiest food may be the best food. A banana and sports drink may be more useful than forcing porridge you do not want.

30-60 minutes before

Thirty to sixty minutes before the start is top-up time.

This is not the moment for a new breakfast. It can help if you ate early, feel slightly hungry, or want to start with a small carbohydrate boost.

Small top-ups include:

• A few bites of banana
• A few jelly sweets
• Half a slice of toast
• Rice cake with jam
• A gel if practised
• A few sips of sports drink

Keep it small and familiar. The goal is to feel ready, not full.

What to eat before an early morning half marathon

Early starts are one of the hardest parts of half-marathon nutrition.

You may not want breakfast at 5.30 am. You may feel nervous. You may be travelling, queueing for toilets or trying to find the bag drop. That is why the decision-making needs to happen the night before.

Before bed:

• Put breakfast out.
• Pack gels, chews or drinks.
• Check travel time.
• Decide when you will have coffee, if you use it.
• Choose a backup option in case your appetite disappears.

If time allows, use a small, low-fibre carbohydrate breakfast 1-2 hours before the start:

• Toast with jam
• Bagel with honey
• Banana
• Rice cakes
• Cereal bar
• Small bowl of cereal
• Sports drink

If solids feel impossible, a drink-based option may help: sports drink, smoothie if you already tolerate it, or a small amount of juice with water. Practise this first, because liquids can still upset some stomachs.

Avoid racing a half marathon with no fuel unless you have tested it, feel good doing it, and it is appropriate for your health and training context. For most runners, a small carbohydrate option is a better compromise than starting empty.

What to drink before and during a half marathon

Half-marathon hydration should support the race, not dominate it.

You want to start normally hydrated, drink to need, and avoid both dehydration and overdrinking.

Hydration the day before

The day before, drink steadily with meals and snacks.

Water is fine. Milk, tea, coffee and other drinks can also contribute to daily fluid intake for many people. If you are travelling, spending time in the sun or eating saltier foods than usual, pay a little more attention.

Do not force huge amounts of plain water. More is not automatically better, and a sloshy stomach is not a performance advantage.

Race morning hydration

On race morning, have a drink when you wake and sip with breakfast.

In the final 30-60 minutes, take small mouthfuls if thirsty. Leave time for the toilet. Avoid suddenly drinking a full bottle because you feel anxious at the start line.

Urine colour can be a rough clue, but it is not a perfect test. Pale yellow often suggests you are reasonably hydrated. Very dark urine, strong thirst or low urine output may suggest you need more fluid. Very clear urine can mean you have overdone it. Supplements, foods, timing and some medications can all affect colour.

During the race

During the race, fluid needs depend on weather, sweat rate, pace, body size and how long you are out.

Some runners need only small sips. Others, especially in hot or humid conditions, need a more deliberate plan.

Before race day, check:

• Where the water stations are
• Whether sports drink is available
• What brand or flavour is offered
• Whether cups or bottles are used
• Whether you need to carry your own soft flask, bottle or hydration vest

If you are taking gels, check whether they need water. Most standard gels are better tolerated with water unless the product says otherwise.

Electrolytes before and during a half marathon

Electrolytes are not mandatory for every half marathon.

They may help if:

• It is hot or humid.
• You sweat heavily.
• You have a longer time on feet.
• You are using a sports drink you have practised.
• You know from training that electrolytes help you feel better.

Salt marks on kit can be a clue, but they are not a prescription on their own. Use them alongside weather, duration, sweat rate and what you know from training.

Electrolytes do not make overdrinking safe. The bigger mistake is forcing large amounts of fluid beyond thirst or need.

Coffee and caffeine before a half marathon

Coffee helps some runners feel more alert and ready to work.

Caffeine can also cause jitters, anxiety, reflux, urgent toilet trips, a racing heart or stomach discomfort. Use it only if you have practised it before running.

Coffee can fit if:

• It is part of your normal pre-run routine.
• You know how much suits you.
• You have time for the toilet.
• You are not taking multiple caffeinated products on top.

Avoid stacking coffee, energy drinks and caffeinated gels unless you have tested that exact routine. If you are pregnant, keep caffeine below 200 mg per day in line with NHS guidance and speak to a healthcare professional if you are unsure.

For more detail, read RunFuel's running hydration guide.

What to eat during a half marathon

During a half marathon, the main fuel question is carbohydrate.

The longer you are racing, the more helpful planned carbohydrate becomes. The aim is not to replace every calorie. It is to keep enough carbohydrate available so the final miles do not become a slow fade.

Under 90 minutes

If you expect to finish under 90 minutes, you may need less during-race fuel.

Some runners race well with breakfast, race-week carbohydrate and maybe a small top-up before the start. Others still like a carbohydrate option such as a gel, sports drink or mouth rinse because it makes the routine feel sharper.

This is optional and personal. If you use fuel, practise it first.

90-120 minutes

For many runners finishing between 90 minutes and 2 hours, carbohydrate during the race is worth planning.

A practical range is around 30-60 g carbohydrate per hour, adjusted for product, tolerance and finish time. You do not need to hit a perfect number, and a 90-minute runner may not need the top end of that range. You need a plan your gut accepts.

This might look like:

• 1 gel around 30-45 minutes, then another around 70-80 minutes
• Chews split into small amounts every 20-30 minutes
• Sports drink at course stations if you have practised it
• A carbohydrate option before the start, then 1-2 gels during the race

Start before you feel empty. If you wait until you are already fading, fuel has less time to help.

2-3 hours or run-walk

For runners taking 2-3 hours, fuel becomes more important.

Breakfast alone may not be enough. You also need to think about carrying fuel, using aid stations and keeping your stomach comfortable.

Options that travel well:

• Gels
• Chews
• Sports drink
• Dates
• Jelly sweets
• Banana pieces
• Small pieces of malt loaf
• Other easy-to-carry foods you have tested

For run-walkers and first-time half marathoners, the best fuel is the one you can actually use while moving. That might mean opening packets before the race, carrying gels somewhere easy to reach, or setting a watch reminder before you forget.

Half-marathon gels and alternatives

Gels are popular because they are small, portable and easy to dose.

They are not compulsory.

You can fuel a half marathon with gels, chews, sports drink or small real-food options, as long as they give carbohydrate and your stomach tolerates them.

How many gels for a half marathon?

It depends on finish time, breakfast, product size and tolerance.

Many gels contain roughly 20-25 g carbohydrate. Check the label because products vary.

As a rough guide:

This is not a prescription. It is a starting point for practice.

If you are using sports drink as well, count that carbohydrate too. Combining strong sports drink with gels can be too much for some stomachs unless practised.

When to take gels

Do not wait until you feel empty.

A common pattern is:

• First gel around 30-45 minutes
• Then another every 30-40 minutes if needed
• Small sips of water with gels, unless the product instructions say otherwise

Some runners prefer a gel 10-15 minutes before the start, then one during the race. Others prefer to wait until 30 minutes in. Both can work if practised.

The right timing is the one that helps you feel steady and does not upset your stomach.

Should you take gels with water?

Usually, yes.

Most standard gels are better tolerated with water, unless the product instructions say otherwise. Water helps dilute the carbohydrate and can reduce the chance of stomach discomfort.

Avoid taking gels with strong sports drink unless you have practised that exact combination. For some runners, the carbohydrate concentration becomes too high and increases the risk of nausea, cramps or urgent toilet stops.

Some isotonic gels are designed to be taken without extra water. Even then, practise in training.

Alternatives to gels

If gels do not suit you, you have options.

Try one of these instead:

• Sports drink
• Chews
• Dates
• Jelly sweets
• Banana pieces
• Malt loaf pieces
• Jam sandwich squares
• Rice cakes
• Small bars designed for sport, if they suit your stomach

The slower you expect to run, the more realistic small real-food options can become. At faster race effort, gels, chews or drinks are often easier because they are quicker to take and lighter to carry.

The rule is simple: fuel has to be portable, easy to use while running, and friendly to your gut.

How to avoid stomach problems before and during a half marathon

Stomach problems are common in half marathons because the race is long enough for fuel and fluid to matter, but hard enough that digestion can feel awkward.

You cannot control everything. You can reduce the obvious risks.

Start here:

• Practise race breakfast before long runs.
• Practise gels, chews or drinks at a similar effort.
• Keep fat and fibre lower close to race time if your stomach is sensitive.
• Avoid unfamiliar foods and products.
• Do not overdrink before or during the race.
• Take gels with water if the product recommends it.
• Leave time for the toilet before the start.
• Check what fuel is available on course before race day.

If you have IBS or a sensitive stomach, individual tolerance matters more than generic food lists.

Simpler pre-race options often work best:

• White toast or bagel with jam
• Rice cakes
• Banana
• Low-fibre cereal
• Crumpets
• Creamed rice
• Sports drink
• Familiar gels or chews

Vegan runners can use toast with jam, oats with fortified soya milk, banana, dates, rice cakes, crumpets, suitable malt loaf, sports drink, gels labelled vegan, or a simple tofu and rice meal earlier in the day.

Dairy-free runners can use plant milk, soya yoghurt if tolerated, toast, bagels, rice, potatoes, fruit, sports drink, smoothies with familiar ingredients or dairy-free cereal bars.

Gluten-free runners can use rice, potatoes, gluten-free toast or bagels, gluten-free oats, rice cakes, banana, yoghurt if tolerated, eggs, tofu or suitable sports drinks and gels. Always check labels if you have coeliac disease or allergies.

If gut symptoms are frequent, severe or unpredictable, do not keep guessing with race-morning food changes. Get personalised advice.

How to practise your half-marathon nutrition plan

Your long runs are dress rehearsals.

You do not need to practise every detail every week. But before race day, you should know how your breakfast, gels, drinks and timing behave when you run for a long time.

Use long runs to test:

• Breakfast timing
• Breakfast portion size
• Coffee or caffeine, if using it
• First gel timing
• How much water you need with gels
• Whether sports drink suits your stomach
• How you will carry fuel
• What happens when the weather is warm

Also check the race website:

• What drink is on course?
• What gel brand is offered, if any?
• Where are the water stations?
• Are cups or bottles used?
• Can you carry your own fuel?

If the race offers a product you have never used, either practise it before race day or carry your own familiar option.

After a long run, write down what happened:

• What you ate the night before
• What you had for breakfast
• When you took fuel
• How your energy felt
• How your stomach felt
• Whether you would repeat it

This is one of the easiest ways to build a race-day plan that belongs to you.

Simple half-marathon race-day food examples

Use these as templates, not rules. The best plan is the one you have practised.

After the finish

This guide is mainly about what to eat before and during a half marathon, so keep recovery simple here.

After the finish, think fluids, carbohydrates and a protein food when you can manage it. If your stomach is unsettled, start small, then eat again later. A sandwich, yoghurt with granola, eggs on toast, a smoothie, jacket potato or rice bowl can all do the job.

For a full recovery breakdown, use RunFuel's dedicated guide on what to eat after running once published.

When to get personalised advice

Most runners can build a half-marathon fuelling plan with familiar foods and practice.

Get personalised advice if you:

• Have diabetes or blood glucose concerns.
• Are pregnant or breastfeeding.
• Have a medical condition affected by food, fluid, caffeine or exercise.
• Have food allergies, coeliac disease or complex dietary restrictions.
• Have IBS or recurring gut symptoms.
• Have a history of disordered eating or feel anxious about fuelling.
• Are worried about under-fuelling, RED-S, missed periods or recurring injuries.
• Repeatedly feel dizzy, faint, shaky or unusually weak when running.
• Are losing weight unintentionally or struggling to eat enough.
• Are using medication that affects hydration, blood pressure, digestion or blood glucose.

RunFuel can help with general running nutrition guidance, but it cannot assess your medical history, allergy risk or individual symptoms. If the same issue keeps showing up, get support from a qualified professional.

Half-marathon nutrition FAQs

These FAQs cover the common questions runners ask when turning the main guide into a race-day plan: extra carbs, breakfast, bananas, gels, electrolytes and whether you can race without eating.