What to eat before, during and after a run
Under an hour you probably need nothing. Over 90 minutes the rules change. Here is what to eat before, during and after, and how to work out which category your run is in.
Table of contents
Most running nutrition advice is written for marathoners and then applied to a 5K, which is why so much of it feels like overkill. The honest answer depends almost entirely on how long you are out for.
Under 60 minutes
You need approximately nothing.
Your muscles already hold enough stored glycogen for well over an hour of easy running. If you have eaten normally in the last several hours, you can head out as you are. Eating "for energy" before a 30-minute run mostly gives you something to digest while running, which is the opposite of helpful.
If you run first thing and feel light-headed, half a banana or a slice of toast twenty minutes before is plenty. That is about blood sugar and comfort, not fuel.
60 to 90 minutes
This is the transition zone. A small carbohydrate-based meal one to two hours before helps: porridge, toast with honey, a banana with a bit of nut butter.
Keep fat and fibre low in that pre-run meal. Both slow gastric emptying, and anything still sitting in your stomach when you start bouncing is a problem you will hear about.
Over 90 minutes
Now fuelling during the run matters. The rough working figure is 30–60g of carbohydrate per hour, starting at about 45 minutes rather than waiting until you feel empty. Once you have run yourself flat, eating does not rescue the session.
That can be gels, chews, dried fruit, or a sports drink — the format matters far less than whether you can stomach it while moving. Which brings us to the important part.
Practise it in training. The single most common long-run disaster is trying a new gel on race day. Your gut adapts to carbohydrate intake during exercise the same way your legs adapt to mileage. Train it.
Afterwards
The 30-minute "anabolic window" has been oversold. For most people running most distances, what matters is that you eat a proper meal within a couple of hours, containing both carbohydrate and protein.
Where the timing genuinely matters is if you are training twice in a day, or running again within about 12 hours. Then getting carbohydrate in quickly measurably speeds glycogen replacement.
A useful rule for a normal training day: eat a real meal you would have eaten anyway, and stop optimising.
Two things worth taking seriously
Underfuelling is more common than overfuelling among women who run. Running is not a reason to eat less. If you are consistently training and consistently losing weight without intending to, that is a signal to eat more, not a sign the plan is working.
Iron matters more for female runners than for most people. Menstrual losses, plus some loss through sweat and foot-strike, make deficiency genuinely common — and its main symptom is exactly what you would expect from training hard: everything feels heavy. It is a simple blood test. If you are unusually flat for weeks on end, ask for one rather than assuming you need to try harder.
Hydration, briefly
Drink to thirst. For runs under an hour in temperate weather you generally do not need to carry anything. Beyond that, or in heat, carry water and drink when you want it.
Overdrinking is a real risk at the long end and is more dangerous than mild dehydration. If you finish a long run heavier than you started, you drank too much.
Where this fits
If you are still building up to the hour mark, most of this is theory for later — the eight-week plan is the practical starting point.
