
The amount of fuel required for a 3-hour run depends on various factors, including the runner's pace, effort level, body weight, and individual differences in metabolism and digestion. Generally, for runs lasting between 1 hour and 3 hours, it is recommended to consume 30 to 60 grams of carbohydrates per hour. This can include sports drinks, carbohydrate gels or chews, fruit, granola bars, or real food like bananas, pretzels, or oatmeal. However, it is important to consider individual tolerances and preferences, as some runners may experience GI issues or flavour fatigue with certain types of fuel. Proper fuelling during long runs can help improve performance, aid in recovery, and prevent symptoms like lightheadedness associated with low blood sugar.
| Characteristics | Values |
|---|---|
| Fuel needed | 30 to 60 grams of carbohydrates per hour |
| Water | 10-24 fl oz of water per hour |
| Carbohydrate-rich food | Bananas, porridge, toast, peanut butter, poached eggs, pretzels, potatoes, low-fibre dry cereal, white bread with honey or jam, granola bars, etc. |
| Other tips | Practice your race day nutrition strategy during training runs; eat a balanced breakfast; fuel within the first 30-45 minutes and every 20-30 minutes after that; consider GI issues and adjust fueling strategy accordingly |
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What You'll Learn

Carbohydrates are key
It is important to note that these recommendations are based on optimising performance and may not be necessary for slower or less intense runs. The amount of carbohydrates you need may also depend on factors such as gut tolerance, exercise intensity, and individual variation. For example, if you have GI issues, you may need to focus on pre- and post-workout meals instead of mid-run fuel.
To ensure you have sufficient carbohydrate stores before your run, it is recommended to have a light but carb-dense meal or snack 2 to 3 hours beforehand. Bananas, raisins, and dried apricots are popular choices for runners because they are simple carbohydrates and high in potassium, an electrolyte lost in sweat. Other options include sports drinks, carbohydrate gels or chews, fruit, or a granola bar.
During your run, you can continue to fuel with sports drinks, gels, or chews, which make it easy to calculate and control your carbohydrate intake. Alternatively, you can fuel with real food such as salted boiled potatoes or sweet potatoes, low-fibre dry cereal, white bread with honey or jam, or pretzels. However, it may be more challenging to determine the exact amount of carbohydrates you are consuming with real food.
Finding the right fuelling strategy for a three-hour run may take some trial and error, but it is important to ensure you are providing your body with the carbohydrates it needs to perform at its best.
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Bananas and raisins
Bananas are a great food to eat before a run. They are tasty, convenient, and inexpensive. Bananas are also a healthy fruit with fibre, protein, and potassium. Many runners eat a banana before a run, and some even eat bananas during their run. One runner on Reddit mentions that they eat a banana and a Clif Bar before a 10-mile run. Another runner mentions that they eat a banana before almost any run.
If you're looking for a way to make bananas more interesting, you could try a recipe for raisins and bananas from a hundred-year-old cookbook. The recipe involves baking the bananas with raisins in a light sugar syrup. The bananas are peeled and cut in half, then arranged in a baking dish with the raisins and syrup poured on top. The dish is then baked until the syrup is hot and bubbly, and the bananas are tender.
Raisins are also a food that runners eat before and during runs. Raisins are high in carbohydrates, fibre, and iron. They also have more thiamin and riboflavin than bananas, although bananas contain more pantothenic acid and folate.
If you're looking to fuel for a 3-hour run, you will need to take on fuel during the run. For runs lasting between 1 hour and 3 hours, it is recommended to consume 30 to 60 grams of carbohydrates per hour. For runs lasting longer than 3 hours, it is recommended to increase this to 30 to 90 grams of carbohydrates per hour. Bananas and raisins are both good sources of carbohydrates.
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Pre-run meals
Preparing for a three-hour run involves fuelling up on the right pre-run meals to minimise fatigue and speed up recovery. Here are some guidelines on what to eat and when to ensure you're properly fuelled for your run:
Timing of Pre-Run Meals:
It is recommended to eat your pre-run meal three to four hours before a long-distance run. This allows adequate time for digestion and absorption. If you're running less than 90 minutes, you may not need a full pre-run meal, and a light snack closer to the run might suffice. However, everyone's digestive system is different, so it's important to experiment and figure out what works best for you.
Food Choices for Pre-Run Meals:
- Carbohydrates: Focus on consuming easily digestible carbohydrates. This includes foods like oatmeal, bananas, white bread with honey or jam, pretzels, crackers, and sports drinks. The recommended amount is 30 to 60 grams of carbohydrates per hour for runs lasting 1:15 to 3 hours. For runs longer than 3 hours, you may need up to 90 grams of carbohydrates per hour.
- Protein: Include a moderate amount of protein in your pre-run meal. A carb-to-protein ratio of 3:1 works well for most runners.
- Limit High-Fat and High-Fiber Foods: Foods high in fat and fibre can slow digestion and put stress on your digestive tract. Keep your pre-run meal low in fat and fibre to prevent gastrointestinal issues.
- Dairy Products: Some people may be sensitive to dairy products, so it's best to limit or avoid them before a run. If you tolerate dairy well, yogurt tends to be a better option due to its lower lactose content.
- Hydration: Proper hydration is crucial. Start hydrating in the days leading up to your run, and continue to drink fluids throughout. The general guideline is to consume 10-24 fl oz of water per hour to avoid dehydration.
Remember, it's important to experiment with different foods and find what works best for your body. The key is to maintain optimal blood sugar levels for your exercising muscles and minimise fatigue during your three-hour run.
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Fuel every 30-45 minutes
For a 3-hour run, you will need to start thinking about fuelling your body with carbohydrates before and during your run. According to nutrition coach Monica Gonzales, your body's glycogen stores will begin to deplete after about 60 minutes of endurance-based exercise. Therefore, for a 3-hour run, you will need to take on fuel during your run.
The recommended intake of carbohydrates during a long run is dependent on the time spent running. For runs lasting between 1.5 to 2.5 hours, it is recommended to take on 30-60 grams of carbohydrates per hour. For runs lasting longer than 2.5 hours, the recommendation increases to 60-90 grams of carbohydrates per hour. However, this may vary depending on individual factors such as body size, intensity, training status, gut tolerance, and exercise intensity.
To ensure you are taking on enough fuel during your 3-hour run, aim to take on fuel every 30-45 minutes. This could include easily digestible carbohydrates such as sports drinks, carbohydrate gels or chews, fruit, or a granola bar. Bananas and raisins are also effective options, as they are high in simple carbohydrates and potassium, an electrolyte lost in sweat. If you are running for 3 hours, you may also want to consider taking on some protein and fat, such as a few almonds, in addition to carbohydrates.
It is important to note that fuelling for long runs may take some trial and error to find what works best for you. Practising your fuelling strategy during training runs will help your body become more accustomed to handling fuel and hydration.
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Sports drinks
Some sports drinks also contain protein, which has been shown to enhance performance during endurance tests. University of Texas researchers found that subjects who consumed a sports drink with added protein performed better than when they drank a carbohydrate-only beverage. When choosing a sports drink with protein, look for a 4:1 carb-to-protein ratio, such as Accelerade drinks. However, it is important to note that these drinks are essentially sugar drinks with little nutritional value, so they should be consumed only during training.
The amount of sports drink you need during a 3-hour run may vary depending on individual factors such as age, sex, weight, exercise intensity, and environmental temperature. As a general guideline, it is recommended to consume 3 to 8 ounces of a sports drink every 15 to 20 minutes during a long run to maintain hydration and energy levels. Additionally, it is essential to listen to your body and adjust your fluid intake accordingly, as drinking too much can also lead to health issues.
To determine your personalised fluid needs, you can perform a sweat test. Weigh yourself before and after a one-hour run at your race pace, and the difference in weight will indicate your fluid loss. This information can guide your fluid replacement strategy, ensuring you stay adequately hydrated during your 3-hour run.
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Frequently asked questions
For a 3-hour run, you should aim for 30 to 90 grams of carbohydrates per hour. This is highly individualised, and you may need to adjust the amount depending on how your body responds.
Good sources of carbohydrates include sports drinks, carbohydrate gels or chews, fruit, granola bars, bananas, oatmeal, pretzels, and maple syrup.
It is recommended to start fuelling within the first 30-45 minutes of your run and then continue to fuel every 20-30 minutes after that.
On average, runners need 10-24 fl oz of water per hour to stay hydrated. It is important to drink enough water, especially if you are consuming carbohydrates, as they can pull water into the stomach and intestines and potentially worsen dehydration.








































