What’s the right way to carb load?

Carb loading isn’t about a single giant pasta dinner. It’s a short, planned strategy to maximize muscle glycogen so you can ride harder for longer. The modern protocol is simpler than the old depletion-and-binge method and works for most riders doing events longer than 90 minutes, especially 3–6 hour road races, fondos, and MTB marathons.

Key idea: taper your training, then eat enough carbohydrate for 24–36 hours using familiar, low-fiber foods and smart hydration. That’s it.

The modern carb-loading protocol (24–36 hours)

For most cyclists, one day is enough to fully stock glycogen if you taper. Two light days can help if you’re coming in tired or training volume stayed high.

• Taper: keep the two days before the event easy (short openers are fine). Avoid draining rides.
• Carb target: 8–12 g carbohydrate per kg body mass in the 24 hours before the event. Most riders do well at 8–10 g/kg; lighter riders or very intense events can push toward 10–12 g/kg.
• Food choices: low to moderate fiber, low fat, and familiar foods to reduce GI risk. Use a mix of solid foods and liquids (sports drinks, juice, smoothies) to hit the numbers without feeling stuffed.
• Distribute intake: eat every 2–3 hours. Aim for 5–7 carb-focused meals/snacks rather than one or two huge portions.
• Hydration and sodium: drink regularly to thirst and include sodium with meals and drinks. Four hours pre-event, drink about 5–7 ml/kg fluid (e.g., 350–500 ml for a 70 kg rider). If urine remains dark two hours out, sip another 3–5 ml/kg. Include some sodium (roughly 300–600 mg) in these fluids or meals to support fluid balance.

Approximate daily carb targets by body mass:

What does that look like in practice?

Example for a 70 kg rider targeting ~9 g/kg (~630 g carbs) in the final 24 hours. Spread across the day and choose options you tolerate well:

• Breakfast: 2 large bagels with jam + 500 ml sports drink (~150–180 g)
• Snack: Low-fiber cereal with milk + banana (~80–100 g)
• Lunch: White rice bowl (2–3 cups cooked) with lean protein + sauce (~120–150 g)
• Snack: Yogurt + honey + pretzels (~70–90 g)
• Dinner (early): Pasta or potatoes with a simple tomato sauce and lean protein (~120–150 g)
• Evening top-up: Fruit smoothie or juice + a couple of rice cakes with honey (~60–80 g)

Good “easy” carb sources: white rice, pasta, potatoes, bread, bagels, pancakes, low-fiber cereal, rice cakes, ripe bananas, applesauce, fruit juice, sports drink, gels, sorbet, gummies, pretzels. Keep fat and fiber lower than usual to reduce fullness and GI load.

Note on body mass: each gram of glycogen stores water. Expect 1–2 kg temporary weight gain from water when fully loaded. That’s a feature, not a bug—it supports performance.

Event morning and during-ride fueling

• Breakfast (3–4 hours pre): 1–3 g/kg carbs from familiar foods. Keep fiber and fat low. Example for 70 kg: 2 g/kg = ~140 g carbs (e.g., large bowl of cereal + toast + juice).
• Top-up (15–30 minutes pre-start): 30–60 g quick carbs (gel, chews, or sports drink). This keeps blood glucose steady into the first effort.
• On the bike: fuel early and consistently. Most riders can handle 60–90 g/h; well-practiced athletes can push 100–120 g/h using multiple carbohydrate sources (glucose + fructose). Practice this in training so the gut keeps up with the watts.
• Fluids: typically 400–800 ml/h depending on sweat rate, temperature, and intensity. Include sodium (roughly 300–600 mg/h; more if you’re a salty or heavy sweater). Adjust by conditions and your own sweat testing.

Quick guide for carb mixes: choose products that combine glucose/maltodextrin with fructose (around 2:1 to 1:0.8). This uses more of the gut’s transport capacity and supports higher grams per hour during long, hard rides.

Special cases, common mistakes, and troubleshooting

Who should carb load?

• Yes: events >90 minutes with sustained intensity (gran fondos, road races, long TTs, MTB marathons). The longer and harder the event, the more it helps.
• Maybe: 60–90 minute TTs or crits; benefits are smaller but still meaningful if you’re targeting peak power and high %FTP.
• Ultra-distance: loading helps for the start, but ongoing fueling (60–100+ g/h) and pacing become the main determinants.

Stage races and back-to-back events

• No full depletion between stages. Instead, prioritize rapid refueling: 1.0–1.2 g/kg/h carbs for the first 3–4 hours post-stage, plus 0.3 g/kg protein across meals/snacks.
• Use easy carbs, fluids, and sodium to restore glycogen and plasma volume. Keep fiber and fat modest until you’re topped up.

Common mistakes

• Only eating a big dinner: one meal won’t fill the tank. You need 24 hours of consistent intake.
• Too much fiber/fat: great for health, not for loading day. Save the salads and heavy sauces for after the event.
• Under-drinking or over-drinking: include sodium and drink to thirst; don’t force liters of plain water.
• Trying new foods or supplements: race with what you practiced.
• No gut training: build up to higher on-bike carbs over weeks so race day at 90–120 g/h feels normal.

If your stomach feels off

• Switch more of your loading to liquid carbs and lower-fiber options.
• Spread intake into smaller, more frequent portions.
• Reduce FODMAP-heavy foods the day before and morning of the event if you’re sensitive.
• Double-check sodium and fluid timing (e.g., split pre-hydration across 4 and 2 hours pre-start).

Carb loading is straightforward when you plan it: taper, target the right grams per kilogram, choose easy carbs, and match fluids and sodium to your needs. Practice your plan in a lower-stakes event or a hard training weekend so your A race feels automatic.