Fuel for speed: Why food timing matters in short-duration events

Author: Franz Studer

Practical nutrition guidance for high-school swimmers, rowers, and track-and-field athletes

Nutrition supports training quality, concentration, growth, recovery, and competition performance. For high-school athletes, however, the last meal is not a magic switch. A 30-second sprint, a 2-minute swim, or a 6-minute rowing race depends mainly on energy stored before the start, especially carbohydrate stored as muscle glycogen. The pre-event goal is therefore simple: arrive fuelled and hydrated without feeling hungry, heavy, or sick. That requires attention to both what is eaten and when it is eaten.

The final 30–90 minutes before exercise are sometimes described as a time when eating is “not ideal,” partly because carbohydrate intake can affect insulin and blood glucose. After carbohydrate is digested, glucose enters the bloodstream and the pancreas releases insulin, which helps muscle and other cells take up glucose and encourages storage. If exercise begins while both blood glucose and insulin are elevated, contracting muscles also increase their glucose uptake, so blood glucose may fall rapidly during the first part of exercise. In some athletes this produces a temporary dip called reactive, or rebound, hypoglycaemia, sometimes accompanied by shakiness, weakness, dizziness, or unusual fatigue. However, not all athletes experience impaired performance, so one has to monitor the effects of food intake of athletes individually during this period of time. A large mixed meal in that period can cause discomfort because it may still be in the stomach when intense exercise begins. Yet a small, familiar, carbohydrate-rich snack can help an athlete who is hungry or has not eaten for several hours. The best choice depends on portion size, food type, nerves, individual tolerance, and the total warm-up or competition schedule.

How the body handles the main fuels

• Carbohydrates and sugars. Starches and sugars are broken down mainly into simple sugars such as glucose. Glucose enters the blood and can be used immediately or stored in the liver and muscles as glycogen. These stores are especially important during hard, fast exercise. “Sugar” is not one single performance food: fruit, milk, bread, cereal, juice, table sugar, and sports drinks contain different carbohydrate mixtures and may also contain fibre, protein, or fat. Simple, low-fibre carbohydrate foods usually leave the stomach faster than a rich mixed meal, which is why they are often easier to tolerate near the start.
• Protein. Protein is digested into amino acids that support growth, tissue repair, and adaptation to training. It is not the main fuel for a short race. A moderate amount in a meal several hours before competition can support fullness and daily needs, but a large protein-heavy meal close to the start may feel slow and uncomfortable. Protein becomes particularly useful after exercise when paired with carbohydrate.
• Fat. Dietary fat is essential for health, hormones, and the absorption of fat-soluble vitamins like vitamin K, and it supplies energy during lower-intensity activity. However, fat slows gastric emptying. Fried food, creamy sauces, large portions of cheese, and other fatty meals shortly before hard exercise can remain in the stomach and contribute to fullness, reflux, nausea, or cramping. Fibre and very large portions can have a similar effect.

A practical pre-event countdown

• Three to four hours before: Eat a normal meal built mainly around carbohydrate, with some lean protein and modest fat and fibre. Examples include oats with milk and banana; rice with chicken and cooked vegetables; pasta with a light tomato sauce and lean mince; or a sandwich with yoghurt and fruit. Athletes should drink fluids steadily rather than trying to “catch up” immediately before the event.
• One to two hours before: Reduce the portion and choose easily digested carbohydrate. Suitable options may include toast with jam, a banana, a small bowl of cereal, low-fat yoghurt, a plain roll, or a modest fruit smoothie. Avoid a large meal, excessive fibre, or unfamiliar food. The closer the start, the smaller and simpler the snack should be.
• Thirty to ninety minutes before: Do not force food if the earlier meal was adequate and you feel comfortable. If you are hungry, have a long warm-up, or last ate several hours ago, use a small low-fat, low-fibre carbohydrate “top-up,” such as half to one banana, a few crackers or pretzels, applesauce, a small slice of toast with honey or jam, or a few sips of sports drink. Avoid burgers, fried food, large protein shakes, big servings of nuts, high-fibre bars, and unfamiliar gels. Test all race-day choices during training.

Applying the plan to short events

Most school swimming races, rowing events, and sprints or middle-distance track races last from about 30 seconds to 6 minutes. The event itself is generally too short to require carbohydrate during the race. Performance depends more on normal daily eating, glycogen already stored, hydration, and avoiding gastrointestinal distress. Carbohydrate loading is unnecessary for a single short event. The 1500 m is longer than many school track races, but it is still normally completed with fuel stored before the start rather than food consumed during the race.

The larger challenge is often the whole meet. A swimmer may have heats and finals, a rower may face repeated races, and a track athlete may contest several events. Between efforts, the athlete should start refuelling early with fluids and carbohydrate, adding a modest protein source when the break is long enough. With less than an hour, choose small amounts of fluid and quick carbohydrate. With one to three hours, use a larger snack such as yoghurt and fruit, a sandwich, cereal with milk, or a recovery drink. Pack familiar foods and use the timetable, not nerves, to decide when to eat.

Young athletes must also eat enough across the entire day to support growth, school, and training. Regular restriction, skipped meals, or frequent fatigue can impair performance and health. Water is appropriate for many short sessions; sports drinks may be useful during long practices, hot conditions, or meets with repeated events, but energy drinks are not a safe substitute. Athletes with allergies, diabetes, recurring stomach symptoms, or concerns about weight or restrictive eating should seek individual advice from a parent or guardian, doctor, or registered sports dietitian.

Carbo loading - myth or fact?

Myth!! Eating copious amounts of pasta at a “pasta party” the evening before a race does not instantly fill an athlete’s energy stores; it is more of a social tradition than an effective fuelling strategy. True carbohydrate loading involves deliberately increasing carbohydrate intake over approximately 24–48 hours, while reducing training, so that the muscles can store additional glycogen. It is mainly useful for prolonged endurance events lasting about 90 minutes or more and is generally unnecessary for the short swimming, rowing, and track events discussed here. A very large pasta meal may instead cause bloating, poor sleep, or stomach discomfort, so athletes are better served by familiar, balanced carbohydrate-rich meals spread across the day.

Summary of how to time your food in short duration events

For short, high-intensity school events, good nutrition is mostly preparation rather than last-minute rescue. Carbohydrate supplies the most accessible fuel for intense work, protein supports repair and growth, and fat is important in the daily diet but may slow digestion before competition. A balanced meal several hours before the start, followed only when needed by a small familiar carbohydrate snack, usually gives the best combination of energy and comfort. The practical rule is simple: fuel early, keep the final snack small, and never experiment on race day.