14-Day Carb-Loading Template Before Race Day: Filling Your Tank with Carbohydrates

Introduction

Carb-loading is the most critical nutritional strategy before endurance events. Research (Bergström, 1967) first confirmed that a high-carbohydrate diet can raise muscle glycogen from a baseline of 80g/kg to 120g/kg—equivalent to 50% more fuel. For a marathon, this means delaying the wall by 5–10 km.

Why 14 Days, Not 3

Traditional carb-loading uses 3 days of high carbohydrate intake plus pre-race depletion, but modern sports nutrition (Burke et al., 2011) recommends a “progressive 14-day” approach:

• Week 1: Gradually increase carbohydrate ratio to 60%
• Week 2 (taper period): Increase carbohydrate ratio to 70%
• Final 3 days before race: Reach 75–80% carbohydrate ratio

This pattern avoids the gastrointestinal discomfort caused by short-term binge eating.

Daily Carbohydrate Intake

Carbohydrate Content of Taiwanese Foods

14-Day Sample Plan (70kg Sub 3:30 Runner)

D-14 ~ D-8 (Regular Training Period)

• Breakfast: Oats 50g + banana + whole milk → 70g carbs
• Lunch: 1.5 bowls white rice + chicken breast + vegetables → 90g carbs
• Dinner: Pasta 250g + chicken + salad → 100g carbs
• Snack: Rice ball + apple → 60g carbs
• Total: Approximately 320g carbs

D-7 ~ D-4 (Early Taper)

• Breakfast: Oats 60g + banana + honey → 90g
• Lunch: 2 bowls white rice + salmon + vegetables → 120g
• Dinner: Pasta 300g + tomato sauce + chicken → 130g
• Snack: Toast + banana + milk → 80g
• Total: Approximately 420g

D-3 ~ D-1 (Peak Loading)

• Breakfast: White congee + egg + rice ball → 100g
• Lunch: 2.5 bowls white rice + roast chicken + blanched greens → 150g
• Dinner: Pasta 350g + shrimp + bread → 180g
• Snack: Energy bar + banana + grape juice → 120g
• Total: Approximately 550g

D-1 (Day Before Race)

• Breakfast & lunch: Light white rice with chicken
• Dinner (before 17:00): Pasta 350g + tomato sauce + bread
• After 19:00: Only fluids and a small amount of fruit

Race Morning

On race day morning (D-day), it is recommended to:

• 3 hours before start: 2 slices white toast + banana + honey → 80g carbs
• 90 minutes before start: Energy bar + half a banana → 40g
• 15 minutes before start: 1 energy gel (25g) + water

Practical Tips

First, reduce fiber—in the 3 days before the race, cut back on vegetables, brown rice, and legumes to avoid gastrointestinal stress. Second, avoid fried and spicy foods—be careful with street vendors at Tokyo Marathon and Taipei Marathon expo days. Third, avoid alcohol completely—alcohol causes dehydration and inhibits glycogen synthesis. Fourth, a 1–1.5 kg weight gain is normal—each gram of glycogen carries 3g of water; this is a sign your glycogen stores are full. Fifth, only eat foods you have tested—don’t try new foods in the week before the race to avoid diarrhea.

Conclusion

Carb-loading is not about binge eating before the race—it is a scientific fueling strategy. Treat these 14 days as the final piece of your training puzzle. The abundant energy on race day will make you deeply appreciate the truth of “full tank, run far.”

Related Reading

• Marathon Pre-Race Carb-Loading: A Practical 3-Day High-Carbohydrate Meal Plan
• Marathon 3-Day Carb-Loading: Complete Guide to Food Choices and Portion Calculations
• Carb-Loading in the Three Days Before a Race: Complete Plan and Practical Examples
• Marathon Carbohydrate Fueling: A Scientific Energy Strategy