Fueling That Actually Scales

Daily Baseline Nutrition

Your daily carbohydrate intake should scale with training volume. On easy weeks (3-4 runs, low intensity), aim for 2-3g carbs per kilogram of body weight. During heavy training weeks (5-6 runs, high intensity), increase to 4-6g/kg. This ensures glycogen stores are replenished without excess that could lead to weight gain.

Protein timing is critical for recovery. Consume 20-30g within an hour post-run to maximize muscle protein synthesis. Spread additional protein throughout the day (aim for 1.6-2.2g/kg total daily) to support ongoing repair and adaptation.

Pair your daily nutrition with proper recovery protocols including sleep and mobility work to maximize the benefits of your fueling strategy.

Pre-Run Fueling Strategy

The goal of pre-run nutrition is to top off glycogen stores without causing gastrointestinal distress. Timing and composition matter more than quantity.

60-90 Minutes Before

Consume 1-2g carbs per kilogram of body weight. Choose low-fiber, low-fat options to speed gastric emptying. Examples: white rice, banana, white toast with jam, or a sports drink. Avoid high-fiber foods (whole grains, beans) and high-fat foods (nuts, avocado) that slow digestion.

Hydration Pre-Run

Sip 300-500ml of fluid in the hour before your run. If it's hot or humid, add 300-600mg sodium to help with fluid retention and prevent hyponatremia. This is especially important when combining with effort-based pacing in challenging conditions.

15-30 Minutes Before

For runs longer than 90 minutes, a small top-up of 20-30g fast-acting carbs (gel, sports drink) can help maintain blood glucose during the early miles. This prevents the initial dip that can occur even when starting with full glycogen stores.

During-Run Fueling Protocol

For runs under 60 minutes, you typically don't need additional fuel beyond what you consumed pre-run. For efforts lasting 60-150 minutes, target 30-60g carbs per hour. For runs exceeding 150 minutes, increase to 60-80g per hour to match increased glycogen depletion.

Carbohydrate Sources

Use a mix of glucose and fructose (2:1 ratio) to maximize absorption. The body can only absorb about 60g/hour of a single sugar type, but mixing allows up to 90g/hour total. Most commercial sports products use this formula, but you can also mix gels with sports drinks.

Electrolyte Management

Sodium needs vary dramatically. Light sweaters may need 300-500mg/hour; heavy sweaters (those who see salt crystals on skin or clothing) may need 800-1200mg/hour. Potassium, magnesium, and calcium are also lost but in smaller amounts—most sports products include these.

Fluid Intake

Aim for 150-250ml every 15-20 minutes in moderate conditions. In heat, increase to 250-350ml. Don't over-drink—sip to thirst rather than forcing large volumes. This prevents both dehydration and hyponatremia (dangerously low blood sodium).

Gut Training: Building Tolerance

Your digestive system adapts to handle more carbs during exercise, but this requires gradual exposure. Start with 30g/hour and increase by approximately 10g per week until you reach your target (60-80g/hour for long efforts).

Practice During Long Runs

Use your weekly long run as a dress rehearsal. Test your race-day fueling plan at race-day effort. This trains both your gut and your pacing discipline simultaneously.

Flavor Rotation

Rotate flavors and brands to avoid palate fatigue. What tastes good at mile 5 may be repulsive at mile 20. Have 2-3 options you know work, and alternate them during long efforts.

Back-to-Back Sessions

Simulate race conditions with back-to-back long runs. This tests your fueling under glycogen-depleted conditions, similar to what you'll experience late in a race. Coordinate with strength work to maintain stability when running on a full stomach.

Post-Run Recovery Nutrition

The 30-minute post-run window is critical for recovery. During this time, your muscles are most receptive to glycogen replenishment and protein synthesis.

The Recovery Window

Within 30 minutes: consume 20-30g high-quality protein (whey, casein, or plant-based complete proteins) plus 1-1.2g carbs per kilogram of body weight. This combination maximizes both muscle repair and glycogen restoration.

Fluid and Electrolyte Replacement

Replace 150% of fluid lost (weigh yourself before and after to calculate). Include electrolytes, especially sodium, to help with fluid retention. For every pound lost, drink 24oz (700ml) of fluid with electrolytes.

When Appetite is Low

After hard efforts, appetite can be suppressed. Start with liquid options: smoothies, chocolate milk, or recovery drinks. These are easier to consume and digest when you're not hungry but need nutrients. Follow up with a solid meal 1-2 hours later when appetite returns.

Reinforce your weekly structure with community challenges that include nutrition goals, creating accountability for consistent recovery fueling.

Race Day Execution

Race day fueling requires precision and practice. Never try anything new on race day—every element should be tested in training.

3-4 Hours Before Start

Breakfast: 2-3g carbs per kilogram, low fat and fiber. Examples: oatmeal with banana, white toast with jam, or rice porridge. This gives time for digestion while topping off stores.

20-30 Minutes Before Start

Top-up: 20-30g fast carbs plus 200-300mg sodium. A gel or small sports drink works well. This prevents blood glucose dip during the first 30 minutes.

At the Start Line

Small sip of water or sports drink only. Keep your gut calm. Nerves can cause GI issues; don't add fuel to that fire.

During the Race

Stick to your tested plan religiously. If you practiced 60g/hour, maintain that. Don't increase because you feel good—that's a recipe for GI distress. Use mindful pacing to match your fueling with effort, and follow recovery protocols post-race to minimize the performance dip.

Special Considerations

Hot Weather Adjustments

Increase sodium intake by 20-30% in heat. Consider adding salt tablets if you're a heavy sweater. Fluid needs increase, but don't over-drink—sip to thirst and monitor urine output.

Altitude Considerations

At elevation, appetite can decrease and digestion slows. Increase pre-run timing to 2-3 hours. Consider liquid calories during runs as they're easier to digest. This is crucial for mountain trail running.

Early Morning Runs

If running within 2 hours of waking, you can skip pre-run fuel if the run is under 90 minutes. Your liver glycogen from overnight is sufficient. For longer efforts, a small 20-30g carb top-up 15 minutes before is beneficial.