The Dietary Code of Professional Cyclists: Nutritional Science from Pre-Race Preparation to In-Race Fueling

Introduction

In the world of professional cycling, nutrition is no less important than training itself. A Grand Tour rider can burn 5,000-8,000 calories per day over three weeks of racing, with extreme mountain stages exceeding 9,000 calories. Precisely fueling the body while maintaining an optimal power-to-weight ratio is a critical skill that modern professional riders must master.

Basal Metabolism and Training Energy Demands

Rider Energy Expenditure

A professional rider weighing 65 kg has vastly different energy demands depending on the training day:

Training Type	Duration	Estimated Expenditure (kcal)	Daily Total Demand (kcal)
Rest Day	None	0	2,000-2,500
Easy Recovery Ride	1-2 hours	500-800	2,500-3,300
Moderate-Intensity Training	3-4 hours	1,500-2,500	3,500-5,000
High-Intensity Long Ride	5-7 hours	3,000-5,000	5,000-7,500
Grand Tour Mountain Stage	4-6 hours	4,000-6,000+	6,000-9,000

Macronutrient Distribution

Professional riders’ macronutrient distribution differs markedly from the general population:

• Carbohydrates: 55-65% of total calories, up to 70% on high-intensity training days
• Protein: 15-20% of total calories, approximately 1.6-2.0 g/kg body weight/day
• Fat: 20-30% of total calories, not deliberately restricted, ensuring normal hormone secretion

Carbohydrate Periodization

Concept Overview

Carbohydrate periodization is one of the most important breakthroughs in sports nutrition in recent years. The core concept is to dynamically adjust carbohydrate intake based on the purpose and intensity of training.

Practical Application

High-Carbohydrate Days (Training/Race Days):

• 8-12 g of carbohydrates per kg of body weight
• For a 65 kg rider, this means 520-780 g of carbohydrates per day
• Food sources: rice, pasta, bread, potatoes, fruit, energy gels

Low-Carbohydrate Days (Recovery or Easy Training Days):

• 3-5 g of carbohydrates per kg of body weight
• Increase the proportion of vegetables, protein, and healthy fats
• The goal is to promote fat metabolism adaptation while giving the digestive system a rest

Train Low (Fasted Training):

• Performing low-intensity training in a low-glycogen state
• Stimulates mitochondrial biogenesis and fat oxidation capacity
• Only suitable for low-intensity sessions; high-intensity training must never be done fasted

Race Day Nutritional Strategy

Pre-Race (Race Morning)

Breakfast on race day is typically eaten 3-4 hours before the start, making it the most important meal of the day for a professional rider:

A typical pre-race breakfast includes:

• A large bowl of rice porridge or oatmeal (200-300 g dry weight)
• Honey or jam
• 2-3 eggs (protein source)
• White toast with peanut butter
• Coffee (caffeine is a legal performance enhancer)
• Fruit

Total calories are approximately 800-1,200 kcal, dominated by easily digestible carbohydrates.

In-Race Fueling (During Race)

This is the area where sports nutrition has advanced most rapidly. In recent years, riders have dramatically increased their carbohydrate intake rates during races:

Traditional recommendation: 30-60 g of carbohydrates per hour
Modern practice: 90-120 g of carbohydrates per hour

This huge leap is thanks to research on “Multiple Transportable Carbohydrates.” The human gut has an absorption ceiling for glucose (about 60 g per hour), but fructose uses a different transport pathway. Therefore, consuming glucose:fructose in a 2:1 or 1:0.8 ratio can push carbohydrate absorption rates to 90-120 g per hour.

Products riders use during races include:

• Energy Gels: 25-40 g of carbohydrates per sachet, easy to carry and consume
• Energy Drinks: 40-80 g of carbohydrates per bottle, also replenishing fluids and electrolytes
• Rice Cakes: Handmade rice cakes prepared by team chefs, with better texture
• Sandwiches and Waffles: Solid food fueling during the first half of the race
• Cola: The “secret weapon” for the final 50 km, combining caffeine and sugar

Post-Race Recovery

The 30 minutes after finishing a race are known as the “golden recovery window”:

• Immediate intake: Recovery drink (containing carbohydrates and protein in roughly a 3:1-4:1 ratio)
• Within 1 hour: A proper recovery meal with plenty of carbohydrates and high-quality protein
• Continued hydration: Based on body weight lost, replenish 1.5 liters of fluid for every 1 kg lost

Weight Management: The Most Sensitive Topic

The Allure of Power-to-Weight Ratio

In professional cycling, especially for GC contenders, power-to-weight ratio (W/kg) is the decisive metric. This means that, assuming power output is maintained, the lighter you are, the better you perform. However, this is also the most dangerous gray area in professional cycling.

The Risk of RED-S

Relative Energy Deficiency in Sport (RED-S) is a serious consequence of the excessive pursuit of low body weight:

• Hormonal disruption (declining testosterone, thyroid dysfunction)
• Reduced bone density (increased fracture risk)
• Impaired immune function (frequent illness, disrupting training continuity)
• Mental health issues (eating disorders, anxiety, depression)

In recent years, several top riders have publicly discussed their past struggles with eating disorders, and the topic is gradually shifting from taboo to open conversation.

Modern Approaches to Weight Management

Nutritionists at top teams adopt healthier, more scientific methods:

• Gradual weight loss: Slow weight loss during the off-season, no more than 0.5 kg per week
• Body composition monitoring: Using DEXA scans to track body fat percentage and muscle mass, rather than looking only at scale weight
• Energy availability monitoring: Ensuring that daily energy intake minus exercise expenditure still leaves enough energy to support basic physiological functions (recommended no lower than 45 kcal per kg of fat-free mass)
• Psychological support: Nutritionists working with psychologists to foster a healthy mindset around food

The Role of the Team Chef

Almost every modern WorldTour team employs a dedicated team chef who travels with the squad and prepares all meals for the riders during races.

The Team Chef’s Challenges

• Working in different hotel kitchens across different countries
• Adjusting recipes to meet each rider’s individual needs
• Operating under strict food safety standards (avoiding food poisoning)
• Keeping food delicious while meeting nutritional requirements

A Typical Grand Tour Daily Menu

Here is a typical daily menu for a GC rider on a mountain stage day:

Breakfast (3.5 hours before the start):
300 g rice porridge, honey, 2 boiled eggs, 2 slices of white toast with jam, 1 cup of coffee, 1 banana

In-Race Fueling (5 hours):
8-10 energy gels, 3-4 bottles of energy drink, 2 rice cakes, 1 sandwich, 1 can of cola

Immediate Post-Race Recovery:
1 recovery drink, 1 banana

Dinner:
200 g grilled chicken breast, 300 g white rice, grilled vegetables, olive oil salad, fruit dessert

Bedtime Snack:
Greek yogurt with honey, a handful of nuts

Latest Trends

Gut Training

Recent research has found that the gut’s tolerance for high carbohydrate intake can be trained. Riders begin practicing high-carbohydrate intake strategies during training to gradually adapt their gut to the 90-120 grams per hour intake required during races.

Personalized Nutrition

With advances in genetic testing and gut microbiome analysis technology, nutrition strategies are moving toward highly personalized approaches. Different riders may have vastly different responses to carbohydrates, caffeine, or even specific foods.

Conclusion

Professional riders’ nutrition has evolved from the rough-and-ready era of “eat more pasta” to precise scientific management down to every gram of carbohydrate and every milliliter of fluid. But beyond all the numbers and science, the most important principle remains unchanged: food is fuel, and it is also the foundation of health. While pursuing peak performance, safeguarding riders’ long-term health is the core value of modern sports nutrition.

Related Reading

• The Science of Energy Intake at the Tour de Taiwan: What Do Pro Riders Actually Eat During Races?
• Cyclists’ Diet Plans: Nutritional Differences Between Training Days and Rest Days
• Cyclists’ Daily Meal Plans: Precise Ratios of Macronutrients
• Cyclists’ Diet Plans: The Optimal Ratio of Carbohydrates, Protein, and Fat