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Race Nutrition

The right nutrition during a race is crucial for success or failure. Professional cyclists burn between 3,000 and 8,000 calories during multi-hour competitions – an enormous challenge for energy balance. Optimal race nutrition requires precise timing, the right selection of nutrients, and an individual strategy that begins days before the competition.

The Three Phases of Race Nutrition

Successful race nutrition is divided into three critical phases that must seamlessly transition into each other. Each phase pursues specific goals and requires different nutrient strategies.

Phase 1: Preparation (24-48 Hours Before Start)

The preparation phase does not begin on race day, but rather 24 to 48 hours beforehand. During this time, the body is systematically prepared for the upcoming load.

Carbohydrate Loading:

Classic carb-loading remains one of the most effective methods to maximize Liver Glycogen stores in muscles and liver. Professional riders consume 8-12 grams of Glycogen Precursors per kilogram of body weight in the last 48 hours before the race. For a 70 kg rider, this corresponds to 560-840 grams of carbohydrates daily.

48h before start
Begin increased carbohydrate intake (8g/kg)
36h before start
Reduce training, continue carbohydrates
24h before start
Maximum carbohydrate intake (10-12g/kg)
12h before start
Last main meal
3h before start
Pre-Race Meal
0h
Race start

Hydration Strategy:

Fluid intake in the preparation phase is equally critical. Riders should monitor their urine color – a light, straw-yellow color indicates optimal hydration. In the last 24 hours before the race, at least 3-4 liters of fluid are recommended, preferably in the form of water, isotonic drinks, and carbohydrate-containing fluids.

Phase 2: During the Race

Nutrition during the race follows a precise schedule and must be adapted to race intensity.

Race Duration
Carbohydrates/Hour
Fluid/Hour
Recommended Sources
Under 60 minutes
0-30g
400-800ml
Water, electrolytes
60-150 minutes
30-60g
500-1000ml
Gels, bars, drinks
150-180 minutes
60-90g
600-1200ml
Multiple carbohydrate sources
Over 180 minutes
90-120g
800-1400ml
Gels, bars, drinks, solid food

The 90g Carbohydrate Protocol:

Modern research shows that the body can absorb up to 90 grams of carbohydrates per hour during very intense loads – provided different carbohydrate types are combined. The optimal mixture consists of glucose and fructose in a 2:1 ratio, as these use different transport pathways in the intestine and thus increase absorption capacity.

Practical Implementation in the Race:

Professional riders follow a fixed nutrition rhythm. Typically, a portion is consumed every 15-20 minutes – whether it's a gel, a sip from the water bottle, or a piece of bar. This regular intake prevents energy crashes and keeps blood sugar levels stable.

Phase 3: After the Race – The Metabolic Window

The first 30-60 minutes after crossing the finish line form the so-called metabolic window, in which the body is particularly receptive to nutrients.

Immediate Measures:

  • 0-15 minutes: 20-30g quickly available carbohydrates + electrolytes
  • 15-30 minutes: Muscle Building Blocks-carbohydrate mix (ratio 1:3 to 1:4)
  • 30-60 minutes: Complete meal with carbohydrates, proteins, healthy fats

The 30-Minute Rule

Within 30 minutes after race end, at least 1.2g carbohydrates per kg body weight and 0.3g protein per kg body weight should be consumed. For a 70kg rider, this corresponds to 84g carbohydrates and 21g protein.

Special Nutrition Strategies by Race Type

One-Day Races (3-7 Hours)

In classics like Paris-Roubaix or the Tour of Flanders, extreme demands are at the forefront: Long duration, high intensity, variable load.

Nutrition Strategy:

  • First 2 hours: 60g carbohydrates/hour (predominantly liquid)
  • Hours 3-5: 90g carbohydrates/hour (mix of gels, bars, drinks)
  • Final phase: Reduction to 60-75g/hour in preparation for the final sprint

Time Trials (30-90 Minutes)

The special challenge in time trials lies in the constantly high intensity combined with difficult food intake.

Time Window
Nutrition Measure
Rationale
3-4h before
Carbohydrate-rich meal (2-3g/kg)
Glycogen optimization
60-90min before
Light snack (30-50g carbohydrates)
Blood sugar stabilization
15min before
Caffeine gel (75-200mg caffeine)
Performance enhancement, focus
During (only if >60min)
Carbohydrate mouth rinse or minimal intake
Central activation without GI stress

Multi-Day Stage Races (Grand Tours)

In three-week stage races, daily nutrition strategy becomes a science. The accumulation of 21 race days with 4,000-7,000 calories burned daily requires meticulous planning.

Daily Nutrition Cycle:

  • Breakfast (6:00): 3-4g carbohydrates/kg, moderate proteins, low fat
  • Pre-Race (8:30): Final snack, 1g carbohydrates/kg
  • During stage: 60-120g carbohydrates/hour depending on stage profile
  • Post-Race (15:00): Recuperation shake, 1.2g carbs + 0.3g protein/kg
  • Dinner (19:00): Balanced meal, focus on quality
  • Before sleep: Casein protein for nightly recovery

Critical Nutrients and Their Role

Sodium and Electrolytes

Sodium loss through sweat varies greatly individually and can range between 200mg and over 2000mg per liter of sweat. "Salty sweaters" – riders with high sodium loss – need up to 1500mg sodium per hour during intense races.

Electrolyte Loss

Average sweat loss during Grand Tour stage:

  • Fluid: 3-8 liters
  • Sodium: 2000-6000mg
  • Potassium: 800-2000mg
  • Magnesium: 100-300mg

Caffeine as a Performance Enhancer

Caffeine is one of the few legally allowed substances with proven performance-enhancing effects. The optimal dosage is 3-6mg per kilogram of body weight, consumed 45-60 minutes before the targeted peak performance.

Timing Strategy for Classics:

  • Kilometer 0-100: No caffeine (base pacing)
  • Kilometer 100-150: First caffeine dose (75-100mg)
  • Kilometer 150-200: Second dose before decisive climbs
  • Final: Maximum caffeine effect in the decision phase

Common Mistakes and How to Avoid Them

The "Bonk" – Complete Glycogen Depletion

A complete performance breakdown due to empty glycogen stores ("bonk" or "hunger knock") can end a race within minutes. Prevention begins before the start with optimized carb-loading.

Warning Signs:

  • Sudden weakness and loss of power
  • Coordination problems
  • Mental confusion or loss of concentration
  • Cold sweat
  • Extreme hunger attacks

Gastrointestinal Problems

Stomach and intestinal complaints during the race are one of the most common causes of DNF (Did Not Finish). Prevention begins with systematic training of nutrient intake.

Problem
Cause
Prevention
Nausea
Too high concentration, too rapid intake
Dilution, slower intake, training
Stomach cramps
Too much fructose, dehydration
Glucose-fructose mix 2:1, sufficient fluid
Diarrhea
Osmotic stress, too much fat/protein
Isotonic solutions, focus on carbohydrates
Feeling of fullness
Delayed gastric emptying at high intensity
Prefer liquid food, reduce intensity

Training Race Nutrition

The ability to absorb high amounts of carbohydrates during intense loads is trainable. Professional riders integrate "Nutrition Training Sessions" into their preparation.

Gut Training for Better Nutrient Absorption

  • Weekly 1-2 long training sessions (3+ hours) with race nutrition
  • Systematic increase in carbohydrate intake from 60g to 90-120g/h over 8-12 weeks
  • Testing different products and combinations in training
  • Simulation of race conditions (intensity, weather, timing)
  • Documentation of tolerance and effect
  • Adjustment based on individual reactions
  • Integration of altitude training with adapted nutrition
  • Periodic testing of maximum absorption capacity

Individual Adaptation and Personalization

Optimal race nutrition is highly individual. Factors such as body weight, metabolic type, training status, heat acclimatization, and personal preferences play a crucial role.

Professional Approach:

  1. Sweat test to determine individual sodium losses
  2. Lactate and metabolic tests to determine fat oxidation rate
  3. Systematic testing of different products in training
  4. Documentation and analysis in competition situations
  5. Continuous adjustment based on performance data

Tip

Keep a nutrition diary for training and competitions. Note timing, amounts, products, and subjective well-being. Patterns become recognizable after 4-6 weeks and enable targeted optimization.

Frequently Asked Questions about Race Nutrition

Question
Answer
How should carbohydrate loading be planned in the 48 hours before a race?
Carb-loading starts 24 to 48 hours before the start, not on race day. Professional riders aim for 8–12 grams of carbohydrates per kilogram of body weight in that window; for a 70 kg rider that means roughly 560–840 grams of carbohydrates per day. A typical timeline begins with about 8 g/kg at 48 hours out, continues carbs while reducing training at 36 hours, peaks at 10–12 g/kg around 24 hours before the start, then moves to the last main meal about 12 hours before and a pre-race meal about three hours before the start.
How many carbohydrates and fluids should I take per hour during a race?
Intake depends on race duration. Under 60 minutes, 0–30 g of carbohydrates and 400–800 ml of fluid per hour (mainly water and electrolytes) are usually enough. From 60–150 minutes, 30–60 g of carbs and 500–1000 ml of fluid from gels, bars, and drinks are typical. Between 150 and 180 minutes, 60–90 g of carbs and 600–1200 ml of fluid from multiple carbohydrate sources are recommended. Over 180 minutes, targets rise to 90–120 g of carbs and 800–1400 ml of fluid per hour, including gels, bars, drinks, and solid food.
What is the 90 g carbohydrate protocol and why use glucose plus fructose?
During very intense efforts the body can absorb up to about 90 grams of carbohydrates per hour if different carbohydrate types are combined. The preferred mix is glucose and fructose in a 2:1 ratio because they use different intestinal transport pathways and thereby raise total absorption capacity. In practice, riders often take a portion every 15–20 minutes—gel, bottle sip, or bar—to avoid energy crashes and keep blood sugar more stable.
What should I eat in the first hour after finishing a race?
The first 30–60 minutes after the finish form the metabolic window, when the body is especially receptive to nutrients. In the first 0–15 minutes, 20–30 g of quickly available carbohydrates plus electrolytes are useful. Between 15 and 30 minutes, a protein–carbohydrate mix in a ratio of about 1:3 to 1:4 follows. By 30–60 minutes, a complete meal with carbohydrates, proteins, and healthy fats is appropriate. Within 30 minutes of race end, the page recommends at least 1.2 g of carbohydrates and 0.3 g of protein per kilogram of body weight—about 84 g of carbs and 21 g of protein for a 70 kg rider.
How does race nutrition differ between classics, time trials, and Grand Tours?
In one-day classics lasting three to seven hours, riders often use about 60 g of carbohydrates per hour (mostly liquid) in the first two hours, then about 90 g per hour in hours three to five, and reduce to 60–75 g per hour in the final phase before the sprint. Time trials of 30–90 minutes emphasize pre-race fueling: a carb-rich meal of 2–3 g/kg three to four hours before, a light 30–50 g snack 60–90 minutes before, a caffeine gel (75–200 mg) about 15 minutes before, and during the effort only a mouth rinse or minimal intake if the event lasts over 60 minutes. In three-week Grand Tours, daily planning covers breakfast at 3–4 g carbs/kg, a pre-race snack of 1 g/kg, 60–120 g carbs per hour on the stage depending on the profile, a Recovery Beverage with 1.2 g carbs and 0.3 g protein per kg, a quality dinner, and casein protein before sleep.
What causes the bonk and how can gastrointestinal problems during a race be reduced?
A bonk is a sharp performance collapse from emptied glycogen stores; warning signs include sudden weakness, coordination problems, mental confusion, cold sweat, and extreme hunger. Prevention starts with optimized carb-loading before the start and steady in-race fueling. Stomach and gut issues are a common reason for DNF. Nausea often comes from overly concentrated or rushed intake and is mitigated by dilution, slower intake, and training. Stomach cramps may relate to excess fructose or dehydration and are addressed with a glucose–fructose 2:1 mix and enough fluid. Diarrhea can stem from osmotic stress or too much fat or protein, so isotonic solutions and a carbohydrate focus help. A feeling of fullness often reflects delayed gastric emptying at high intensity, so liquid food and slightly lower intensity are preferred.
How can gut training and sodium strategy improve race-day tolerance?
High carbohydrate intake under intensity is trainable. Riders typically include one to two weekly long sessions of three or more hours with race nutrition and raise intake from about 60 g to 90–120 g per hour over eight to twelve weeks while testing products, simulating race conditions, and documenting tolerance. Sodium loss in sweat varies widely from about 200 mg to over 2000 mg per liter; salty sweaters may need up to 1500 mg of sodium per hour in intense races. On a Grand Tour stage, average losses can reach 3–8 liters of fluid, 2000–6000 mg of sodium, 800–2000 mg of potassium, and 100–300 mg of magnesium, so individual sweat testing and a nutrition diary over four to six weeks support personalization.

Last Update: November 2, 2025