Sports Nutrition: The Complete Guide to Optimizing Your Performance

Learn sports nutrition fundamentals: macronutrients, hydration, and pre/post-workout timing. Evidence-based guide for all athletes.

schedule6 min read·July 22, 2026

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The essentials in 30 seconds

Sports nutrition is the pillar that turns a good workout into visible results.

  1. 1.The three macronutrients, protein, carbs, and fats, each play a specific role in performance and recovery.
  2. 2.Hydration is as important as nutrition. A 2% body weight loss in water reduces performance by 20%.
  3. 3.Meal timing matters, but total daily intake remains the number one factor for body composition.
  4. 4.Supplements are secondary. No supplement replaces a balanced diet, good sleep, and consistent training.

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📖 What is Sports Nutrition?

Sports nutrition is the study and application of nutritional principles to optimize athletic performance and recovery. Unlike general nutrition which aims for health, sports nutrition adapts intake based on the type of effort, intensity, duration, and specific goals of each athlete.

Whether you run, lift weights, do CrossFit, or play football, nutritional needs vary considerably. A marathoner doesn't have the same needs as a powerlifter. Sports nutrition takes these differences into account to offer tailored strategies.

It rests on three fundamental pillars: energy intake (how much you eat), composition (what you eat), and timing (when you eat). Mastering these three aspects allows you to maximize training adaptations and reach your goals faster.

Balanced plate with vegetables, protein, and whole grains

💪 The Three Macronutrients: Fuel for Performance

Macronutrients are the nutrients the body needs in large quantities to function. There are three: proteins, carbohydrates, and fats. Each plays a specific and irreplaceable role in athletic performance.

Protein: Build and Repair

Proteins are the building blocks of muscle. They provide the amino acids needed to repair muscle fibers damaged during exercise and to synthesize new muscle tissue. For an athlete, the recommended intake is between 1.6 and 2.2 g per kg of body weight per day, depending on training intensity.

Spread your protein across 3-4 meals per day, with 20-40 g per serving. The body can only absorb a limited amount of protein per meal for muscle synthesis.

Carbohydrates: Energy First

Carbohydrates are the muscles' preferred energy source during exercise. Stored as glycogen in muscles and the liver, they fuel high-intensity efforts. Needs vary from 3 to 12 g per kg of body weight, depending on training volume and intensity.

Carbs don't make you fat. It's total caloric excess that leads to weight gain. For an athlete, drastically reducing carbs can harm performance and recovery.

Fats: Endurance and Hormones

Fats are essential for hormone production and serve as fuel for long-duration, low-intensity efforts. They should represent 20-35% of total caloric intake. Prioritize quality sources: olive oil, avocado, nuts, fatty fish.

💧 Hydration: The Often Overlooked Factor

Water represents about 60% of body weight, and dehydration of just 2% can reduce performance by 10-20%. During exercise, the body loses water and electrolytes through sweat. These losses must be compensated to maintain muscle function, thermoregulation, and concentration.

The basic recommendation is to drink 30-40 ml of water per kg of body weight per day, adjusting upward on training days. For efforts lasting over an hour, a drink containing electrolytes (sodium, potassium) and carbohydrates is recommended.

Activity LevelRecommended Water (L/day)Electrolytes
Sedentary2-2.5 LNot needed
Moderate training (< 1h)2.5-3 LRecommended in hot weather
Intense training (> 1h)3-4 LEssential (sodium, potassium)
Athlete hydrating after exercise

🕐 Meal Timing: Before, During, After Exercise

When you eat directly influences your performance and recovery. While total daily intake remains the most important factor, optimizing timing can make the difference between a good workout and a great one.

Before Exercise (2-3 hours)

A meal rich in complex carbs, moderate in protein, and low in fat and fiber for easy digestion. Example: brown rice, grilled chicken, cooked vegetables.

During Exercise (if > 60-90 min)

30-60 g of carbohydrates per hour in the form of drinks, gels, or bars. The goal is to maintain blood sugar and spare muscle glycogen.

After Exercise (30-60 min window)

This is the key moment for recovery. Combine 20-40 g of protein with 0.8-1.2 g of carbs per kg of body weight to replenish glycogen and start muscle repair.

The famous 'post-workout shake' isn't magic, but it's convenient. A complete solid meal within 2 hours of exercise is just as effective.
Various protein sources: eggs, fish, meat, legumes

🧪 Supplements: Useful but Secondary

No supplement replaces a balanced diet. Supplements are, by definition, there to complement insufficient intake, not to serve as a foundation. Before thinking about supplements, make sure your diet, sleep, and training are already optimized.

SupplementProven EffectivenessWhen to Take It
Protein powder (whey)★★★★★Convenient for hitting daily quota
Creatine monohydrate★★★★★5 g/day, any time
Caffeine★★★★☆30-60 min before exercise, 3-6 mg/kg
Omega-3★★★☆☆With meals, 1-3 g/day EPA+DHA
BCAA★★☆☆☆Little benefit if protein intake is sufficient

📅 Meal Planning: The Key to Consistency

The best nutrition strategy is the one you can follow over time. Planning meals in advance helps avoid impulsive choices and ensures the right foods are available at the right time.

A few simple principles: prep your meals in advance (meal prep), keep healthy snacks on hand, and adjust your portions based on your activity level for the day. A rest day doesn't require the same intake as a double-training day.

Use an app like Atlo to track your daily intake and automatically adjust your goals based on your activity. The AI coach can even generate personalized meal plans.

🏃 Nutrition Tailored to Your Sport

Each discipline has specific nutritional requirements. Adapting your diet to your sport helps optimize performance and recovery.

Weightlifting and Strength

Protein priority (1.8-2.2 g/kg) with moderate to high carb intake (4-7 g/kg) to support intense training. Creatine is the most effective supplement for this type of sport.

Endurance (running, cycling, swimming)

Carbs are king (6-12 g/kg). Intake during exercise is crucial for sessions over 90 minutes. Fats become an important energy source at low intensity.

Team Sports (football, rugby, basketball)

Alternating explosive efforts and active recovery. Balanced need for carbs (5-8 g/kg) and protein (1.6-2.0 g/kg). Hydration is critical due to intermittent efforts.

Atlo How Atlo Simplifies Your Sports Nutrition

Atlo is a platform that unifies nutrition, training, and recovery in one place. Instead of juggling three different apps, you get an overview of your progress. The AI coach cross-references data from all three pillars to give you coherent recommendations.

Key nutrition features: tracking of 100+ metrics per food, CIQUAL+USDA+Open Food Facts database, photo meal analysis, barcode scanning, AI coach-generated meal plans, and intermittent fasting support (15+ protocols).

Atlo offers a 7-day free trial, then €8.99/month (€69.99/year). The Pro plan unlocks the AI coach, generated programs, and meal photo analysis. The Pro plan unlocks the AI coach, generated programs, and meal photo analysis.

Athlete reviewing nutrition and performance data

📚 Sources and References

This guide is based on recognized scientific sources and official sports nutrition recommendations.

❓ FAQ

How much protein should I eat per day if I exercise?
For a regular athlete, the recommended intake is between 1.6 and 2.2 grams of protein per kilogram of body weight per day. If you weigh 70 kg, that's 112-154 g of daily protein. This intake is higher than for a sedentary person (0.8 g/kg) because exercise increases muscle protein breakdown and synthesis.
Should I eat before or after training?
Both are important. Eat a complete meal 2-3 hours before exercise (rich in carbs, moderate in protein) to have energy. After exercise, consume 20-40 g of protein with carbs within 60 minutes to optimize recovery. If you train early in the morning fasted, the post-workout meal becomes the priority.
Are supplements really necessary?
No, supplements are not necessary if your diet is balanced. Whey protein is convenient for hitting your protein quota, and creatine monohydrate is one of the few supplements with solid evidence of effectiveness (5 g/day). Everything else is secondary. Start by optimizing your diet, sleep, and training before investing in supplements.
How much water should I drink during exercise?
The general rule is to drink 150-250 ml every 15-20 minutes during exercise. For efforts lasting over an hour, add electrolytes (sodium, potassium). The best indicator: weigh yourself before and after exercise. Each kilogram lost corresponds to about 1 liter of water you should have drunk.
What is the 'anabolic window' and is it a myth?
The 30-60 minute post-workout 'anabolic window' exists but its importance is often exaggerated. It's crucial if you train fasted or multiple times a day. But if you've eaten within 3-4 hours before training, you have more leeway. What matters is hitting your total daily protein and calorie targets.
How do I adapt my diet if I'm vegetarian or vegan?
It's entirely possible to perform well on a plant-based diet. Key points: combine plant protein sources (legumes + grains) to get all essential amino acids, monitor intake of iron, zinc, calcium, vitamin B12, and omega-3s. Pea, rice, or soy proteins are excellent alternatives to whey.

📖 Read next

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Yazio vs MyFitnessPal: Which Tracker to Choose?

Muscle Building Nutrition: The Complete Guide to Building Muscle

Take It to the Next Level with Atlo

Atlo's AI coach cross-references your nutrition, training, and recovery data to give you a truly personalized plan. Start for free.

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