The right nutrition before a run decides how long you can hold your pace and whether digestive trouble shows up during the effort. The key is to balance your energy intake and choose foods that agree with your body even under physical load.
Why eat before a run
A meal before a run tops up muscle and liver glycogen stores and supplies the energy the body needs under load. The main role is played by carbohydrates – the body can convert them into glucose quickly and use them efficiently as fuel for the muscles.
Taking carbohydrates even in the last hour before the start does not cause a drop in blood sugar, as used to be assumed. On the contrary, it helps keep glucose levels stable and may improve performance.
Which foods to choose
Carbohydrates
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Complex carbohydrates (e.g. porridge oats, rice, pasta, white bread) – suitable if you eat 2–4 hours before the run.
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Simple carbohydrates (banana, dates, white toast, an energy gel) – suitable in the last hour or just before the start.
Protein
A smaller amount helps stabilise blood sugar, but an excess slows digestion and can trigger digestive problems.
Fats
Fats are digested slowly. Before a short or medium-length run they are not suitable.
A small amount is acceptable only if you eat 3–4 hours before the effort.
When to eat before a run
3–4 hours before the start
The ideal time for a larger meal dominated by carbohydrates, with a moderate amount of protein and a minimum of fat and fibre.
1–2 hours before the run
Choose a lighter meal with faster-digesting carbohydrates.
0–60 minutes before the run
You can eat in the last hour too – as long as you choose easily digestible carbohydrates and a small amount.
Taking carbohydrates just before the start (within 15 min) or even during the first minutes of the effort does not worsen performance – on the contrary, it may improve it.
What to avoid and why
The most common causes of gut trouble before a run relate to the composition of your food and drinks:
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Too much fibre, fat or protein – slows digestion and increases the risk of cramps.
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Drinks with high osmolality (carbohydrates and electrolytes that are too concentrated) – can cause diarrhoea.
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Fructose without glucose present – is absorbed less well and often causes bloating.
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Milk with lactose – in sensitive people it can lead to wind and nausea.
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Unfamiliar foods or supplements – if you have not tried them in training, they can cause trouble.
Summary
Your pre-run food should supply energy without burdening digestion.
The basis is easily digestible carbohydrates, a small amount of protein and a minimum of fat and fibre.
What matters most is timing:
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a full meal 3–4 hours before,
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a lighter meal 1–2 hours before,
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a small snack just before the start.
Train not only your body but also your digestive system – so you can rely on your nutrition fitting you during the effort just as well as your pace does.
References:
- Lorang, J., & Sandbakk, Ø. (2019). The Science of Running: Improving Performance and Preventing Injury. Oslo: Human Performance Publishing, str. 132–148.
- Jeukendrup, A., & Gleeson, M. (2010). Sport Nutrition: An Introduction to Energy Production and Performance. Champaign: Human Kinetics, str. 67–84.
- McArdle, W.D., Katch, F.I., & Katch, V.L. (2015). Exercise Physiology: Nutrition, Energy, and Human Performance. Baltimore: Lippincott Williams & Wilkins, str. 245–261.
- Burke, L. M. (2015). Practical Sports Nutrition. Champaign: Human Kinetics, str. 92–108.
- Ivy, J.L., & Portman, R. (2004). Nutrient Timing: The Future of Sports Nutrition. North Bergen: Basic Health Publications, str. 34–48.
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