Race Day Nutrition: The Complete Guide to Performing Your Best

You have been training for weeks. Your legs are ready. But a poor nutritional decision on race day can ruin all that hard work. The good news is that planning your race day nutrition is straightforward if you follow a few basic rules (World Athletics).

2-3 days before: carb loading

Your body stores energy as glycogen in the muscles and liver. To fill those stores to the max, increase the proportion of carbohydrates in your meals during the 2-3 days leading up to the race (Mayo Clinic) (WHO). This is not about eating double the amount, but about shifting the ratio:

• Increase: Pasta, rice, bread, potatoes, oats, fruit
• Reduce: Fats and fibre (which can cause gastrointestinal discomfort)
• Avoid: Alcohol, heavy meals, new foods, spicy dishes

Pre-race breakfast

Eat breakfast 2-3 hours before the start. It should be high in carbs, low in fat and fibre, and familiar (something you have eaten before long training runs).

Safe options:

• White bread with jam + banana
• Porridge (not too much) with honey and banana
• Toast with peanut butter and jam
• Rice pudding (a classic that works brilliantly)

Absolutely avoid: Too much dairy, high-fibre cereals, acidic fruits, fatty foods, excess coffee if you are not a regular drinker.

Nutrition during the race

Your needs change drastically depending on the distance:

Distance	Typical duration	Need gels?	Hydration
5K	20-35 min	No	Water if it is hot
10K	40-70 min	Optional (1 gel if 55+ min)	Water at aid stations
Half marathon	1:30 - 2:30 h	Yes (2-3 gels)	Sports drink + water
Marathon	3:00 - 5:00 h	Yes (5-7 gels)	Full sports drink plan

Recommended gels

• SiS Go Isotonic Gel - No water needed, easy to take while running
• Maurten Gel 100 - Hydrogel technology, minimal digestive issues

See our complete gel guide with the top 10.

Hydration during the race

Drink at aid stations, but do not overdo it. Hyponatraemia (drinking too much) is more dangerous than mild dehydration while running. General rule: drink when thirsty, 150-250 ml every 15-20 minutes. Sports drinks like Isostar provide electrolytes along with fluid. See our hydration drinks guide (ACSM).

Post-race recovery

The first 30-60 minutes after the race are the optimal window to kickstart recovery. Your body absorbs nutrients more efficiently during this period.

• First 30 min: Recovery drink with protein + carbs. A recovery shake like 226ERS Recovery is the most practical option. See our recovery supplements guide.
• 1-2 hours later: A real meal with carbs, protein and vegetables. Pasta with chicken, rice with salmon, or similar.
• Rest of the day: Keep hydrating and eat normally. Your body needs calories to repair itself.

Common mistakes

• Trying new gels on race day. Around 30% of runners experience gastrointestinal issues from using untested gels. Always train with the same gel you will use in competition.
• Drinking too much. Hyponatraemia is a real risk. Drink to thirst, do not force it.
• Eating too much for breakfast. More food does not mean more energy. A moderate breakfast 2-3 hours before the start is enough.
• Not eating anything afterwards. If you skip food in the first 60 minutes, recovery is significantly delayed.
• Heavy dinner the night before. The pre-race dinner should be normal, not a three-course pasta party. Carbs + light protein is enough.

Frequently asked questions

How many hours before should I eat breakfast?

2-3 hours before the start. If the race begins at 9:00 AM, eat breakfast at 6:00-7:00 AM. If waking up that early is tough, a light snack 60-90 minutes before also works.

Do I need gels for a 10K?

If your 10K takes less than 50-60 minutes and you had a proper breakfast, you do not need them. If it is going to take longer, one gel at the 30-minute mark is good insurance. For a 5K, never.

What happens if I eat something new on race day?

Your digestive system can react badly. Never try new food, gels or drinks on race day. Everything should have been tested during long training runs.