Fueling the Long Run: Nutrition Tips for Long-Distance Runners

The weekly long run is where most half marathon nutrition mistakes actually show up, not on a normal Tuesday, but on the Saturday you're out for 90-plus minutes without a fueling plan. This guide covers what to eat and drink before, during, and after your long run specifically, so you're rehearsing your race-day fueling every week instead of guessing on the day itself.

Fueling Before Your Long Run

Eat a carbohydrate-focused meal 2 to 3 hours before you head out, giving your body time to digest and store that fuel as glycogen. Good options include oatmeal with banana, toast with honey, a bagel with a thin layer of peanut butter, or a bowl of cereal with milk. Keep fat and fiber moderate at this meal; both slow digestion and raise your odds of a mid-run stomach problem.

If you're running first thing in the morning and can't fit in a full meal 2 to 3 hours out, a smaller carb snack, like a banana, a few crackers, or a small glass of juice, 30 to 60 minutes before still tops off your glycogen without requiring a big meal that early.

Fueling During Your Long Run

Once a long run passes about 75 to 90 minutes, your glycogen stores start running low enough that in-run fueling starts to matter — shorter long runs generally don't need it. From that point, aim for 30 to 60 grams of carbohydrate per hour, taken in small, steady amounts rather than one large dose.

Reliable options:

• Energy gels, typically 20 to 25 grams of carbs each, taken with water
• Chews or blocks, usually 20 to 25 grams per serving (check the label)
• Bananas or dried fruit, if you prefer whole food
• Sports drink, if you'd rather sip than chew

Start with the lower end of that range and adjust up if you're still fading late in the run. This is also where you find out which products your stomach tolerates at running pace, something you want to know weeks before race day, not during it.

Refueling After Your Long Run

Your muscles are most receptive to nutrients in the 30 to 60 minutes right after you stop, so don't skip this window because you're not hungry yet. Combine carbohydrate, to restock glycogen, with protein, to start muscle repair. Grilled chicken with quinoa and vegetables, a lentil salad with rice or whole-grain bread, or a protein smoothie with a banana all work well.

Skipping or delaying this meal doesn't ruin one long run, but doing it consistently adds up. You'll recover more slowly week over week and show up to your next hard session more depleted than you should be.

Hydration on Long Run Days

Long runs are also where dehydration does the most damage, since you're sweating steadily for an extended stretch. Drink consistently through the day leading into a long run rather than trying to load up right beforehand, and replace electrolytes as well as water on hot or humid days. For a full hydration plan and how to figure out your sweat rate, see Hydration Strategy for Half Marathon. A hydration calculator can turn your numbers into a specific fluid target for long run days.

Treat Every Long Run as a Race-Day Rehearsal

The point of dialing in long-run fueling isn't just comfort on that one Saturday, it's finding out, weeks in advance, exactly what food, timing, and hydration plan works for your stomach at race pace. For the bigger picture of how your day-to-day diet supports these long runs, see Healthy Nutrition for Half Marathon Training, and for the general principles behind all of this, see our complete half marathon nutrition guide.

Frequently Asked Questions

When should I eat before a long run?

Eat a carbohydrate-focused meal 2 to 3 hours before you start, choosing something moderate in fat and fiber so it digests fully before you run. If you're short on time, a small carb snack like a banana 30 to 60 minutes out still tops off your glycogen without needing a full meal.

How much should I eat during a long run?

Once you're past about 75 to 90 minutes of running, aim for 30 to 60 grams of carbohydrate per hour from gels, chews, bananas, dried fruit, or a sports drink. Start at the lower end and increase if you're fading late in the run, and use your long runs to figure out which products your stomach tolerates before race day.

What should I eat after a long run?

Aim for a meal combining carbohydrate and protein within 30 to 60 minutes of finishing, such as grilled chicken with quinoa and vegetables, a lentil salad with rice or bread, or a protein smoothie with a banana. Carbohydrate restocks glycogen and protein starts muscle repair, and consistently skipping this window slows your recovery over time.

How can I stay hydrated on long run days?

Drink consistently throughout the day leading into your long run rather than loading up right before you head out, and replace electrolytes as well as water on hot or humid days. A hydration calculator can turn your sweat rate and run length into a specific fluid target for long run days.