Carb loading for endurance rides: still relevant?

Carb loading isn’t about eating until you feel like a bread factory. Done right, it’s a focused, short-term strategy to maximize glycogen so you can ride harder for longer and finish strong. Here’s how to know when it helps, and how to execute it without gut drama.

When carb loading actually helps

Glycogen is your high-octane fuel for tempo, threshold, and surges above threshold. Topping it up before a big day can improve time to exhaustion, steady-state power, and the ability to attack late in the ride.

• Good use cases: Events or training rides longer than 90–120 minutes with meaningful intensity (tempo, climbs, surges), centuries/gravel races, fondos, and stage races.
• Less critical: Rides under 90 minutes, low-intensity recovery spins, or very easy endurance days. A normal balanced day of eating is enough.
• Intensity matters: The more you expect to ride near or above threshold, the more full glycogen stores help.
• Taper matters: Reducing training volume 24–72 hours pre-event allows muscles to store more glycogen from the same carb intake.
• Expect scale changes: Every gram of glycogen stores about 3 g of water. A temporary 1–2 kg increase is normal and performance-positive.

Bottom line: If your long ride will include sustained tempo or hard efforts, carb loading is still worth it. If it’s a coffee cruise, save it for another day.

The simple carb-loading playbook

You don’t need the old-school “deplete then overfeed” protocol. Modern evidence supports a short, high-carb phase with a taper. Choose the level that fits your event and your stomach.

Pick your target

• 2–3 hour hard ride or race: 6–8 g carbohydrate per kg body mass in the final 24 hours.
• 3–5 hour event or intense race: 8–10 g/kg over 24–36 hours.
• Ultra or stage race: 10–12 g/kg over 36–48 hours, especially with a solid taper.

Example daily targets (choose a point in the range that feels realistic):

Make it digestible (without feeling like a bakery)

• Keep it low-fiber and low-fat: Prioritize white rice, potatoes, pasta, rice cakes, pancakes/waffles, low-fiber cereals, oats (if you tolerate them), ripe bananas, fruit purees, yogurt, tortillas, pretzels, sports drinks, juices.
• Spread intake across the day: 4–6 eating occasions plus liquids make the total much easier to hit.
• Drink some of your carbs: Sports drinks, juice, chocolate milk, and smoothies add 30–60 g portions without feeling stuffed.
• Add salt: Use salt on meals and include sodium in drinks to aid fluid retention and reduce cramping risk.
• Light protein, minimal fat: Include 15–25 g protein per meal; keep fats modest to speed gastric emptying.
• Train your gut: Practice this approach before key events so your stomach knows the plan.

24–48 hour example (70 kg rider)

Target: 8–10 g/kg = 560–700 g/day. Here’s one way to reach ~600–650 g without overdoing volume:

• Breakfast: 2 cups cooked white rice with eggs and soy sauce (~120 g carbs) + 300 ml sports drink (20–30 g).
• Snack: Low-fiber cereal with milk or yogurt (~80 g) + banana (~25–30 g).
• Lunch: Large baked potato and chicken breast; add bread or a tortilla (~120–140 g).
• Afternoon: Rice cakes with jam and honey (~60–80 g) + juice (~25–30 g).
• Dinner: Pasta with simple tomato sauce (~150–180 g) + a roll (~25–30 g).
• Evening top-up: Pancakes with maple syrup (~70–90 g) or recovery drink (~50–60 g).

Hydration during the loading window:

• Fluids: Sip regularly; total daily fluid close to thirst, typically 30–40 ml/kg across the day for most athletes.
• Sodium: Include 500–1,000 mg sodium per liter in at least some of your fluids.

Common mistakes (and quick fixes)

• Too much fiber/fat: Swap whole grains/roughage for lower-fiber options and keep sauces light.
• New foods on race week: Use familiar staples you’ve digested well before.
• Under-drinking or no sodium: Include salted foods and sodium-containing fluids.
• “Dieting” into an event: Cutting carbs in race week costs glycogen and power.
• Training hard while loading: Reduce volume 40–60% while keeping a touch of intensity.
• Worrying about scale weight: The extra water attached to glycogen is performance fuel, not “bloat.”

Note: If you manage diabetes or significant GI conditions, coordinate a plan with a qualified clinician or sports dietitian.

Race morning and during-ride fueling

Pre-ride breakfast

• Timing: 3–4 hours before start.
• Amount: 1–4 g/kg carbs depending on your gut and start time (for 70 kg, that’s 70–280 g).
• What it looks like: Pancakes with syrup, rice and eggs, bagel with honey, low-fiber cereal and milk, fruit smoothie, plus a sports drink if needed.
• Top-off: 15–20 minutes before the start, take 20–30 g fast carbs (gel, chews, small bottle of sports drink) if breakfast was >2 hours earlier.

On-bike fueling guide

• 2–3 hours: 60–75 g carbs per hour.
• 3–5 hours: 70–90 g/h.
• Very long or high power with a trained gut: Up to 90–120 g/h using mixed carbohydrate sources (glucose + fructose). Build to this in training.
• Fluids: Typically 500–750 ml/h, more in heat or high sweat rates. Add sodium to match conditions (roughly 300–800 mg/h for most).

Post-ride recovery (especially for multi-day events): 1.0–1.2 g/kg carbs in the first hour plus 20–30 g protein, then resume regular meals.

Quick takeaways: Load for rides longer than 90–120 minutes with real intensity. Use 6–12 g/kg across 24–48 hours, keep fiber and fat low, include sodium, and train the plan. Finish it with a carb-rich breakfast and steady on-bike fueling.