
Nutrition is an important aspect of triathlon preparation, and eating the right foods can help maximise performance. The ketogenic diet has become a popular approach for athletes looking to lose weight and reduce their reliance on carbohydrates for fuel. However, it's important to note that the keto diet may not be suitable for everyone and could potentially impact performance. In the days leading up to a triathlon, it's recommended to focus on consuming adequate carbohydrates, such as pasta, rice, potatoes, and bread. Lean protein is also beneficial, but the priority should be on carb-loading to ensure optimal energy levels during the race. The pre-race meal is crucial, and it's advised to eat familiar foods that are easy to digest and rich in carbohydrates, moderate in protein, and low in fat and fibre.
| Characteristics | Values |
|---|---|
| Timing | Eat 2.5-3 hours before bedtime the night before the race. Eat breakfast 2.5-3 hours before the race starts. |
| Carbohydrates | High-carb meals are recommended for pre-race meals to improve performance. Carbohydrates should make up about 70% of your plate. |
| Protein | Meals should be moderate in protein. |
| Fat | Avoid eating foods with high fat content. |
| Fiber | Keep fiber intake to a minimum to avoid digestive distress. |
| Caffeine | If you are a regular coffee drinker, stick to your routine. Avoid caffeine after 1 pm. |
| Hydration | Drink 5-7 ml of fluid per kg of body weight 2-4 hours before racing. |
| Familiarity | Eat familiar foods to avoid gastrointestinal issues. |
| Spicy foods | Avoid eating spicy foods. |
| Portion sizes | Avoid overeating. |
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What You'll Learn
- The night before: Eat familiar, easy-to-digest carbs, lean protein, and minimal fibre
- Breakfast: Eat 2.5-3 hours before the race. Include carbs and caffeine
- During the race: Consume gels, sports drinks, and energy bars for quick fuel
- Training diet: Focus on a wholesome, balanced daily diet with adequate calories
- Keto considerations: Consider potential performance impact and adjust carb, protein, and fat intake

The night before: Eat familiar, easy-to-digest carbs, lean protein, and minimal fibre
The night before a triathlon, your dinner should consist of familiar, easy-to-digest carbohydrates, lean protein, and minimal fibre. This meal should be planned to be eaten early, around 5 pm-6 pm, and at least 2.5-3 hours before bedtime. This timing ensures that digestion does not sabotage your sleep, which is crucial for race day.
For easy-to-digest carbohydrates, you can choose from white rice, pasta, bread, quinoa, or potatoes. Carbohydrates should be the priority, making up about 70% of your plate. You can also include some vegetables, such as cooked green beans or a small side salad, but it is important to minimise high-fibre plant foods to avoid digestive distress on race day.
When selecting protein sources, opt for lean proteins such as grilled chicken, salmon, or lean steak. The protein portion should be moderate, with carbohydrates taking centre stage.
It is important to avoid spicy foods, fried foods, carbonated beverages, uncooked meat, and unfamiliar foods. Stick to foods that you regularly consume and have practised during your training. This reduces the risk of gastrointestinal upset or foodborne illness, which could negatively impact your performance.
Additionally, hydration plays a crucial role in your pre-race routine. The American College of Sports Medicine recommends drinking 5-7 ml of fluid per kg of body weight slowly in the 2-4 hours leading up to the race. This will promote hydration and allow enough time for the excretion of excess water.
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Breakfast: Eat 2.5-3 hours before the race. Include carbs and caffeine
Breakfast is an important meal on the day of your triathlon. It's recommended that you eat breakfast 2.5 to 3 hours before the race starts to allow plenty of time for digestion. If you're not a breakfast person, you can still have a sports drink and half a sports bar or energy chews 90 minutes before the race.
For breakfast, you should aim to eat a high-carbohydrate meal. This could be pancakes, waffles, toast, or bagels. If you're on a ketogenic diet, you might not need to eat as many carbohydrates as your body can utilize more fat as fuel. However, for most athletes, eating a high-carb meal before a triathlon improves performance.
Along with breakfast, it's important to have some caffeine if you're a regular coffee drinker. This will give you a light performance boost and ensure you get a pre-race bowel movement.
- Blueberry oatmeal with coffee
- Peanut butter and jelly oatmeal with bananas and coffee
- Turkey sausage egg sandwich with coffee
- Pizza with coffee
- Cereal with milk and coffee
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During the race: Consume gels, sports drinks, and energy bars for quick fuel
The ketogenic diet is a low-carbohydrate method of eating that may lead to weight loss and improved body composition. It is popular among athletes, including triathletes, as it may help reduce body fat and reliance on carbohydrates for fuel. However, there is insufficient evidence to prove that the ketogenic diet improves performance, and some studies suggest that it may even impair race performance.
During a triathlon, it is essential to maintain proper nutrition to keep your energy levels high. The swim leg typically comes first, and if you have carb-loaded effectively, your muscles will be well-nourished. Consider taking a sports drink or gel before and after the swim, depending on the race length and your preference.
The bike leg is when you should kick-start your fuelling strategy. It is often easier to eat solid foods during this stage, such as sandwiches, flapjacks, and energy bars, which can be stored in zip-up food bags attached to the bike frame.
For quick fuel during the race, consume gels, sports drinks, and energy bars. These provide fast-release carbohydrates that deliver energy to your muscles rapidly. Other options include gummy sweets, dried fruit, and even sandwiches, depending on your preference.
If you are following a ketogenic diet, your body is adapted to utilise fat as fuel, so you may not need to eat as frequently during the race. However, it is crucial to maintain proper recovery nutrition to replenish energy stores and support muscle fibre repair.
Some keto-friendly options during the race include peanut butter and nuts, which are calorie-dense and can provide a quick energy boost. Remember, it is essential to experiment with different foods and find a fuelling strategy that works best for you.
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Training diet: Focus on a wholesome, balanced daily diet with adequate calories
A triathlon is a challenging event, and nutrition is often referred to as the fourth discipline of the sport, as it plays a crucial role in training and performance. A wholesome, balanced daily diet with adequate calories is essential for maximising training adaptations and recovery. Here are some key considerations for a triathlete's training diet:
Carbohydrates
Carbohydrates are the body's primary fuel source, especially for high-intensity exercises like triathlons. Carbohydrate-rich foods such as pasta, rice, potatoes, quinoa, bread, and other grain-based foods should be a priority in your diet. Aim for carbohydrates to take up about 70% of your plate. However, it is important to note that the ketogenic diet, which involves a significant reduction in carbohydrate intake, is a personal choice that some athletes make. While it may lead to weight loss and better body composition, there is a risk of negatively impacting performance.
Protein and Healthy Fats
Include moderate amounts of lean protein in your diet, such as grilled chicken, fish, or lean steak. Healthy fats are also important, but the amount will depend on your chosen diet. If you follow a ketogenic diet, your fat intake will be higher as your body uses fat as its primary fuel source.
Meal Timing and Frequency
Eating regular meals and snacks throughout the day is essential for maintaining energy levels. Aim for three main meals and two to three snacks spaced evenly throughout the day. Your biggest meal should be breakfast, which you should aim to eat by 9 am to give your body time to digest. Eating smaller meals for lunch and an early dinner is recommended, with the lightest meal being in the evening.
Hydration
Staying hydrated is crucial for optimal performance. Drink adequate fluids throughout the day, and consider sports drinks to replenish electrolytes. The American College of Sports Medicine recommends drinking 5-7ml of fluid per kg of body weight 2-4 hours before racing.
Individual Calorie Needs
Remember that calorie needs vary from person to person, depending on height, weight, gender, training regimen, and metabolism. As a triathlete, you may need to increase your calorie intake, especially from carbohydrates, to match your energy expenditure.
Pre-Race and Race-Day Nutrition
In the days leading up to the race, focus on familiar, easy-to-digest meals that are rich in carbohydrates, moderate in protein, and low in fat and fibre. Avoid spicy foods, fried foods, carbonated beverages, and uncooked meat. The night before the race, eat dinner at least 2.5-3 hours before bedtime to optimise digestion and sleep. On race day, eat a carbohydrate-rich breakfast 2.5-3 hours before the start, and consider a sports drink and energy bar closer to the event for an extra boost.
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Keto considerations: Consider potential performance impact and adjust carb, protein, and fat intake
The ketogenic diet is a personal decision, but it may negatively impact performance. The keto diet flips traditional athlete macronutrient ratios, with very few carbohydrates, moderate protein, and high amounts of fat. This shift aims to change the body's fuel source from carbohydrates to fat.
For most athletes, a high-carb meal before a workout improves performance, but fat-adapted keto athletes are an exception. Their bodies can utilize more fat as fuel, so they may not need to eat as frequently during training.
If you decide to follow a keto diet, consider the potential performance impact and adjust your carb, protein, and fat intake accordingly. Here are some specific considerations:
- Carbohydrates: While keto athletes aim to reduce carbohydrate intake, some carbohydrates are still necessary for energy. Choose easily digestible carbohydrates such as white rice, pasta, bread, or sports-specific options. You may need to increase your carb intake slightly before and during the triathlon to ensure adequate fuel, especially if you are not yet fat-adapted.
- Protein: Keto diets typically include moderate protein intake. Before the triathlon, opt for lean protein sources such as grilled chicken or steak, and low-fat dairy like Greek yogurt or string cheese.
- Fat: Keto diets emphasize high-fat consumption. However, in the days leading up to the triathlon, it is crucial to maintain a balanced intake to prevent gastrointestinal distress. Avoid overeating, as it can increase fat storage when calories burned are lower.
- Timing: Plan your meals carefully to ensure proper digestion and sleep. Eat dinner early, at least 2.5-3 hours before bedtime. On the morning of the race, aim for a high-carb breakfast 2.5-3 hours before the start, and consider a sports drink and energy bar closer to the race.
- Hydration: Proper hydration is critical. Follow the American College of Sports Medicine's recommendation of drinking 5-7ml of fluid per kg of body weight 2-4 hours before racing.
Remember, it is essential to listen to your body and make adjustments as needed. The keto diet may not be suitable for everyone, and individual results may vary.
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Frequently asked questions
It is important to stick to familiar foods and to not experiment with new dishes right before a triathlon. Meals with lean protein and low-fat dairy are good options. Examples include chicken, rice, and salad, or salmon, asparagus, and rice. If you are on a keto diet, you will want to avoid eating too many carbohydrates.
It is recommended to eat your pre-race dinner earlier than usual to allow for adequate digestion and better sleep. It is also important to stay hydrated, so be sure to drink water and electrolytes throughout the day before the race. If you are on a keto diet, you may want to eat a high-fat meal, as your body will be using fat for fuel instead of carbohydrates.
If you are a regular coffee drinker, stick to your routine before racing. It is recommended to eat breakfast 2-3 hours before the race starts to allow time for your meal to digest. If you are on a keto diet, you may not need to eat as much before the race since your body can utilize more fat as fuel.











































