Key takeaways
- You do not need to carb-load like a marathoner. A half is short enough that normal, slightly carb-leaning meals do the job.
- Eat a familiar, carb-based breakfast 2-3 hours before the start. Never try something new on race day.
- For most people, one gel or none plus water is plenty for 13.1 miles.
- Get something with carbs and protein in within an hour of finishing, then just eat a normal meal.
A half marathon is one of the most rewarding distances there is: long enough to feel like a real achievement, short enough that you do not have to upend your life to prepare. The good news: fuelling for it is simpler than the internet makes it sound. You do not need a spreadsheet, a scale or a cupboard full of gels.
This guide walks through exactly what to eat in the days before, on race morning, during the run and afterwards, all with real, everyday food. No counting, no rules you will resent by Tuesday.
Why fuelling matters for a half
Your body stores carbohydrate as glycogen in your muscles and liver. On an easy day that store is plenty. But running 13.1 miles draws it down steadily, and when it runs low, your pace fades, your legs feel heavy and your head gets foggy. That is the wall, and fuelling well is how you push it past the finish line.
The aim is not to eat more. It is to eat the right things at the right times so you start topped up and stay steady. Most runners who bonk in a half did not train badly; they just under-fuelled the morning of, or tried something new their stomach rejected.
The week before your half marathon
Forget dramatic diet changes. The week before is about consistency, not loading. Keep eating the meals that have got you through training.
Days 7 to 2: keep it normal
Eat balanced meals with a carb base: oats, rice, pasta, potatoes or bread, plus protein and vegetables. Stay hydrated through the day. This is also the worst possible week to clean up your diet or cut carbs; you want those glycogen stores full, not depleted.
The 2 days before: lean a little more on carbs
This is carb-loading, simplified. You do not need to double your dinner. Just shift the balance of your plates slightly toward carbs and slightly away from heavy fats and fibre, so your stomach is calm on race morning. A bigger bowl of pasta two nights before, a rice-based lunch the day before: that is the whole trick.
The night before
Eat a carb-rich dinner you have eaten before and know agrees with you. Pasta with a simple tomato or chicken sauce is the classic for a reason. Eat at a normal time, not super late, and do not stuff yourself. You are topping up, not bingeing. Have a glass of water with dinner and another before bed, and go easy on alcohol.
Race-morning breakfast
This is the meal that makes or breaks a half. The goal: top up your liver glycogen, which drains overnight, with easy-to-digest carbs, without sitting heavy in your stomach.
How early to eat
Aim to finish breakfast 2 to 3 hours before the gun. That gives your body time to digest so you are not running on a full stomach. If you are an early-wave runner and cannot face a full meal at 5am, a smaller carb snack 60-90 minutes before works too.
| Time before start | What to eat |
|---|---|
| 2-3 hours | Porridge with banana and honey, or toast with jam and a little peanut butter |
| 60-90 min | A banana and a slice of toast, or a small bagel with honey |
| 15-30 min | Optional: half a banana, a few sips of sports drink, or one chew |
Drink water steadily through the morning, but stop big gulps around 45 minutes out so you are not queuing for the loo at the start.
The one rule: nothing new
Whatever you eat on race morning, you should have eaten it before a long training run first. Race day is not the time to discover that a new energy bar disagrees with you. Practise your exact breakfast on your last few long runs.
Fuelling during the race
Do you actually need gels for a half?
For most runners finishing in around 1.5 to 2.5 hours, the honest answer is: not many. If you ate well beforehand, your stores will carry most of the distance. A small amount of carbohydrate in the second half can help maintain energy and focus, but you are not refuelling the way a marathoner does.
A simple during-run plan
- Sip water at the stations, especially in the first half and when it is warm. Little and often beats one big drink.
- Take one gel or a few chews around the halfway point if you use them. Wash it down with water, not sports drink, to avoid an upset stomach.
- Do not experiment. Use exactly what you trained with, and know which drink the race hands out at stations.
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Recovery starts in the first hour. You do not need anything fancy. The goal is to replace fluids and give your muscles carbs and protein to start repairing.
- Straight away: water or an electrolyte drink, plus something easy: a banana, chocolate milk or a recovery shake.
- Within a couple of hours: a proper meal with carbs and protein. Eggs on toast, a burrito, a roast. Whatever you fancy.
- Then enjoy it. You ran a half marathon. The post-race meal is part of the reward. Eat the thing you have been looking forward to.
Common half-marathon fuelling mistakes
Skipping breakfast to feel light
You will feel light for about 8 miles, then empty. Eat the breakfast.
Trying a new gel or food on race day
The classic cause of mid-race stomach trouble. Practise everything first.
Over-drinking at every station
Sloshing and toilet stops slow you more than mild thirst. Sip to thirst.
Cutting carbs the week before
This is the one week to keep them in. Low stores means an early wall.
Frequently asked questions
What should I eat the night before a half marathon?
A carb-rich dinner you know agrees with you: pasta, rice or potatoes with a simple protein. Eat at a normal time, do not overdo it, and go easy on fibre, heavy fats and alcohol.
How many gels do I need for a half marathon?
Most runners need zero to one or two. If you fuelled well beforehand, one gel around halfway is plenty. Faster runners may take none; those out longer than around 2.5 hours may want two. Always test in training first.
Should I carb-load for a half marathon?
Not in the dramatic marathon sense. Just lean your meals a little more toward carbs for the two days before. You do not need to eat huge volumes. Consistency matters more than a single giant pasta dinner.
What if I cannot eat early in the morning?
Have something small you can stomach: a banana, a slice of toast with honey, or a few sips of a smoothie, 60 to 90 minutes before. Practise it on early long runs so race morning feels routine, not forced.
