Optimal nutrition for swimmers: A short guide for beginners and professionals

Proper nutrition is the invisible engine of your swim training. It determines whether you maintain clean technique until the very last lap or whether your arms feel like lead.

Current studies paint a clear picture: Many swimmers—from recreational to elite—eat too few carbohydrates. Women and amateurs, in particular, often underestimate their energy needs in the water. The result: Reduced performance and slower recovery.

In this article, we break down the science into practical terms. We provide you with precise guidelines (in grams per kilogram of body weight), clearly differentiate between beginners and professionals, and address the question of supplements.

1. The Foundation: Cornerstones for Every Day

Before we talk about timing, the foundation needs to be solid. Your needs depend heavily on your training volume. While beginners need a strong base, professionals have to manage enormous amounts of energy on intense days.

Macronutrients: How Much Do I Really Need?

Here are the scientifically recommended daily guidelines:

Nutrient and function	Beginner / Leisure (Moderate)	Ambitious / Elite (High Volume)
carbohydrates	3–6 g per kg of body weight	6–10 (up to 12) g per kg of body weight
Protein	1.2–1.6 g per kg of body weight	1.6–2.0 g per kg of body weight
Fat	25–35% of daily energy	20–30% (Reduce on tough days!)

Key finding: On intensive training days, professionals should reduce their fat intake to create enough space in the stomach for the necessary carbohydrates without putting a strain on digestion.

2. Before Swimming: Fueling Up

The goal before jumping into the water: Replenish glycogen stores and avoid stomach problems.

The Timing (1–4 hours beforehand)

Studies recommend an easily digestible meal with 1–4 g of carbohydrates per kg of body weight.

Choose: Oatmeal, rice, pasta, white bread, fruit.

Avoid: Too much fiber (whole grains right before the start) and large amounts of fat, as these can be difficult to digest.

The "Early Bird Swimmer Problem"

Many competitive swimmers jump into the pool on an empty stomach in the morning and thus miss their target times.

Solution: If a large meal isn't possible, small snacks or liquid carbohydrates (sports drinks, smoothies) shortly before the start can help. Especially for young athletes and sprinters, adequate pre-workout nutrient intake is directly linked to better performance.

3. During Swimming: When Do I Need to Drink?

For a typical session (under 60–90 minutes), water is sufficient. However, different rules apply to long-distance swimming or open water swimming (over 2 hours):

Fluids: Drink 300–600 ml per hour to avoid both dehydration and overhydration.

Energy: Regularly replenish carbohydrates and electrolytes to maintain stable blood sugar levels.

4. After Swimming: The Recovery Window

After training comes the next training session. Your body now needs building blocks for repair (protein) and energy to replenish its stores (carbohydrates).

The "Golden Hour" (30–60 minutes after exertion)

If you're training again the next day or have multiple sessions a day, this time window is critical.

Carbohydrates: The goal is approximately 1 g per kg of body weight. This quickly replenishes glycogen stores.

Protein: Approximately 0.3 g per kg of body weight of high-quality protein (dairy products, whey, eggs, meat, or soy) optimally supports muscle adaptation.

Example for a 70 kg swimmer:

Requirements: Approximately 70 g carbohydrates + 21 g protein.

Meal: A large bowl of muesli with yogurt and a banana, or a recovery shake plus a pretzel.

5. Supplements: Useful or a Waste of Money?

The market is flooded with pills and powders. But what does science say?

The "Food First" Approach

Guidelines agree: An optimized basic diet beats any supplement. Many swimmers (including young people) use supplements indiscriminately without having their basic nutrition under control. This is the wrong approach.

What Can Be Useful for Professionals

For elite swimmers, the following supplements can be beneficial during specific phases (after consulting with experts):

Caffeine: A proven performance booster.

Creatine: For speed and explosiveness.

Beta-alanine & sodium bicarbonate: Buffer acid in the muscles during high-intensity training.

Beetroot juice: Can improve oxygen efficiency.

For recreational swimmers, supplements are usually unnecessary – regular meals and basics (whole grains, vegetables, protein sources) are significantly more effective.

Conclusion: Swim smarter, eat better!

The formula for success in the water isn't a secret, it's science:

Beginners: Focus on regular meals, eat a carbohydrate-rich snack before training, and replenish your protein afterward.

Advanced swimmers: You need a plan. Periodize your carbohydrate intake (more on tough days), pay meticulous attention to protein timing (0.3 g/kg after exercise), and use supplements only as a targeted, essential component.

Your next step: Calculate your needs. How much is 1.2 g of protein or 5 g of carbohydrates for your body weight? Use this figure to roughly check your meals. You'll feel the difference in the water!