You've laced up, headed out for a run, and hit a wall at the halfway point, legs heavy and energy gone, even though you felt fine the day before. If that sounds familiar, the problem is very often what (or when) you ate beforehand, rather than your fitness itself. Nutrition is one of the most underrated parts of running performance, and it's a topic I enjoy working through with clients who run recreationally or are training for their first event.
You don't need to be an elite athlete or follow a rigid plan to benefit from better fuelling. A few practical adjustments around your runs can make a genuine difference to how you feel, both during the run and for the rest of the day.
Fuelling before you run
What you eat before a run depends heavily on timing and the length of the run ahead. For a short, easy run, especially first thing in the morning, many people manage perfectly well on an empty stomach or with something light. For anything longer than about 45 minutes to an hour, though, having some carbohydrate on board beforehand tends to make a noticeable difference to how strong you feel.
If you're eating two to three hours before running, a balanced meal with carbohydrate, some protein and moderate fat works well, think porridge with fruit, or wholemeal toast with eggs. Closer to your run, within 30 to 60 minutes, it's best to keep things lighter and easier to digest, such as a banana, a small handful of dried fruit, or a slice of toast with honey. Rich, high-fat or high-fibre meals too close to a run are a common cause of stomach discomfort mid-run, so it's worth experimenting to find what sits well for you personally.
For anyone training towards a longer event, a half marathon or marathon in particular, the day or two before matters more than the morning of the race. Gradually increasing your carbohydrate intake slightly over the final day or two, while keeping meals familiar and easy to digest, helps top up your glycogen stores without overloading your gut right before the start line. This is exactly the kind of race-week planning I help clients work through, since it's very individual and depends on what your gut has tolerated well in training.
Recovering well after a run
The post-run window is where a lot of recreational runners miss an easy opportunity. After a run, particularly a longer or more intense one, your body needs both carbohydrate to replenish glycogen stores and protein to support muscle repair.
- A glass of milk, a smoothie, or a yoghurt with fruit are simple, effective post-run options
- Wholegrain toast with peanut butter or eggs covers both carbohydrate and protein well
- A balanced meal within an hour or two of a longer run helps recovery along nicely
- Don't skip eating after a run because you feel you've "earned a deficit"; consistent under-fuelling catches up with performance and recovery over time
Aim to eat something within an hour or two of finishing where possible, particularly after longer runs, rather than waiting until you're next due a meal.
It's also worth thinking about protein across your whole week, not just immediately after training. Runners who are increasing their mileage need slightly more protein overall to support the repeated muscle repair that comes with regular training, so spreading protein-rich foods like eggs, dairy, tofu, beans and fish across your meals, not just your post-run snack, tends to serve recovery better than one large hit after each session.
Hydration and electrolytes for runners
Staying on top of your fluids matters just as much as food, and it starts before you even head out the door. Turning up to a run already dehydrated makes everything feel harder than it needs to. For most runs under an hour, plain water before and after is generally sufficient.
For longer runs, particularly in warm weather or if you're a heavy sweater, you lose electrolytes like sodium alongside water, and replacing these becomes more important. An electrolyte drink, or even a pinch of salt and a squeeze of lemon in water, can help maintain your fluid balance on longer efforts. It's a good habit to notice your urine colour after a run too; dark urine is a fairly reliable sign you need to rehydrate more thoroughly.
A practical way to judge your own sweat losses is a simple before-and-after weigh-in around a longer run in similar conditions to what you're training for. A noticeable drop in weight after a run suggests you're under-drinking relative to what you're losing, and it gives you a personal benchmark rather than relying purely on general guidance.
Common mistakes I see with runners' nutrition
A few patterns come up again and again in my consultations with recreational runners, and they're usually easy to fix once identified.
- Trying a completely new food or drink on race day rather than testing it during training first
- Under-eating overall, especially when training volume increases, which leads to fatigue and poor recovery
- Skipping breakfast before a morning run longer than 45 minutes to an hour
- Not replacing fluids and electrolytes adequately after longer or hotter runs
- Relying on caffeine or energy products without also addressing the basics of regular, balanced meals
It's also worth saying that nutrition needs are genuinely individual. Two people running the same distance at the same pace can have quite different fuelling needs, depending on body size, training history, gut tolerance and even the time of day they run. This is exactly why I prefer working through a runner's actual training week with them in a consultation, rather than handing over a generic plan that ignores how differently everyone responds.
Good nutrition for running doesn't need to be complicated or restrictive. It's about consistent, well-timed meals that support your training, proper hydration, and enough overall fuel so that your body can adapt and recover between sessions. This overlaps closely with broader goals like sustainable weight loss for runners who are also trying to manage their weight, where under-fuelling around training can actually work against progress rather than for it.
If you would like personalised support with nutrition for running, I offer one-to-one online consultations. View my consultation packages or book a free discovery call to discuss how I can help.