Carb loading might be the most misunderstood thing in endurance nutrition. Half the riders at Iceman will do some version of it, and a solid chunk of those will do it in a way that makes them slower, heavier, and more uncomfortable on the start line than if they’d just eaten normally.
The good news is that the actual protocol is simple. Simpler than what most people are doing. The modern version doesn’t require a depletion phase, doesn’t require a week of misery, and doesn’t require you to eat until you’re sick.
The loading itself happens in the final 48 hours before the race. The planning, though, should happen well before that — which foods, how much, bought and in the house before race week turns into a logistical scramble.
What Carb Loading Actually Is
Your muscles store carbohydrate as glycogen. Under normal eating, you’re carrying a certain amount. Carb loading is the deliberate practice of eating substantially more carbohydrate than usual, while training very little, to push those stores above their normal ceiling.
Done properly, you can raise muscle glycogen well above baseline. In practical terms, that’s a bigger fuel tank for race day — one that delays the point at
last third of the race becomes an exercise in survival.
That’s the whole mechanism. It doesn’t make you fitter. It doesn’t raise your threshold. It extends how long you can hold the fitness you already have.
Who Actually Benefits
This matters, because the answer isn’t “everybody.”
The benefit shows up in efforts lasting roughly 90 minutes or longer at meaningful intensity. Below that, you aren’t going deep enough into your stores for the extra capacity to matter, and you’ve just carried some extra water weight to the start line for nothing.
The 30-mile race: Yes, for nearly everyone. Front-of-race riders finishing near 1:45 are right at the threshold and still benefit. Everyone behind that — the 2:15 riders, the 2:45 riders, the 3:30-and-beyond riders — benefits more, not less. The longer you’re out there, the more this matters.
The Slush Cup: Depends on you. Nine miles with real climbing, ridden in November, puts plenty of riders in the 60-to-90-minute range and some beyond it. If you expect to be out there over an hour, a modest version is worth doing — not a full aggressive load, but a carbohydrate-forward day before and a solid breakfast. If you’re a stronger rider finishing well under an hour, just eat normally and focus on a good breakfast. Don’t carry pointless water weight up those climbs.
The Sno-Cone: No. Please do not carb load a six-year-old. Feed them breakfast and bring snacks.
The Protocol: Simpler Than You’ve Heard
Forget the old-school version with the depletion phase — the brutal week where you ride yourself empty, eat almost no carbohydrate for three days, feel terrible, then gorge. That approach came out of research from the 1960s. It works, but it’s unnecessary, it leaves you flat and irritable during a week when you want to feel good, and it carries real risk of showing up stale.
The modern version:
One to two days of high carbohydrate intake, combined with minimal training.
That’s it. For Iceman, that means Thursday and Friday, with Friday being the more important of the two.
Your number
Target 8 to 12 grams of carbohydrate per kilogram of body weight per day during the load. Most riders do well in the 8 to 10 range — the top end is genuinely hard to eat and tends to cause more GI trouble than it’s worth.
Run the math in advance so you’re not doing it Thursday night:
- 140 lb rider (64 kg): roughly 510–640 g per day
- 160 lb rider (73 kg): roughly 580–730 g per day
- 180 lb rider (82 kg): roughly 650–820 g per day
- 200 lb rider (91 kg): roughly 730–910 g per day
Those numbers are much larger than normal eating. That’s the point. Most riders who think they carb loaded ate a big pasta dinner and landed around 350 grams for the day, which is barely above maintenance.
The taper is half the equation
This is the part people skip, and it’s not optional. The reason the modern protocol works without a depletion phase is that you’re not burning through what you’re storing. If you’re still doing hard efforts Thursday and Friday, you’re filling a tank with a hole in it.
Race week training should be short and easy. A couple of short spins with a few brief openers is plenty. The fitness is already banked — nothing you do in the last five days makes you faster, and plenty of things you could do make you slower.
How to Actually Eat 700 Grams of Carbohydrate
The practical obstacle is volume. Whole grains, beans, and big vegetable servings are excellent food and terrible options for this. You’ll be full long before you hit your number, and you’ll be carrying a lot of fiber into race morning.
Shift toward lower-fiber, more concentrated sources during the load:
- White rice instead of brown
- White pasta and white bread instead of whole grain
- Potatoes without skins
- Fruit juice and sports drink alongside whole fruit
- Bananas, grapes, melon
- Pancakes, waffles, bagels, pretzels, crackers
- Sports drink mix, which is a genuinely useful tool here — a few hundred grams of carbohydrate can go down as fluid far more easily than as food
- Honey, jam, syrup, sugar in your coffee
Dial down during these two days:
- High-fiber grains and large volumes of raw vegetables
- Beans and legumes
- Large salads
- High-fat foods, which fill you up and crowd out the carbohydrate you’re trying to eat
And eat on a schedule. Four to six smaller carbohydrate-focused meals works far better than three enormous ones. Trying to hit a big number in three sittings is how people end up bloated and miserable.
Protein and fat don’t go to zero. Keep protein moderate — around 1.2 to 1.6 g/kg is plenty for these two days — and let fat drop somewhat. You’re shifting the ratio, not eliminating anything.
The Scale Will Go Up. That’s Correct.
Glycogen is stored with water — roughly three grams of water for every gram of glycogen. A successful load typically shows up as two to four pounds of weight gain, sometimes more.
That water is not a penalty. It’s stored fuel plus the hydration that comes with it, and it’s part of why loaded riders handle a cold, long day better. Do not weigh yourself Friday night, panic, and skip breakfast Saturday morning. I have watched riders undo a perfect week over a number on a bathroom scale.
If you know this will bother you, the simplest fix is to not step on the scale during race week.
The Mistakes That Actually Cost People
Loading with fat instead of carbohydrate. The classic pre-race pizza, the fettuccine alfredo, the cheese-heavy everything. These are fat-dominant meals wearing a carbohydrate costume. They fill you up, slow gastric emptying, and leave you short of your target.
Starting too early. A full week of loading doesn’t store more glycogen than two days does. It just means five extra days of feeling heavy and sluggish.
Trying new foods. Race week is the worst possible time to introduce an unfamiliar sports drink, a new bread, or a restaurant you’ve never been to. Everything you eat Thursday and Friday should be something your gut already knows.
Forgetting about fiber. A big jump in total food volume with your normal high-fiber choices is a recipe for an uncomfortable Saturday morning. Reduce fiber deliberately starting Thursday.
Alcohol. Friday night with friends is tempting, and a beer won’t ruin you. But alcohol impairs glycogen storage directly, disrupts sleep, and increases fluid loss — all three of which are exactly what you spent two days building. Save it for the finish line, where it’ll taste considerably better anyway – but after the protein!
Neglecting sodium and fluid. Storing glycogen requires water, and you need sodium to hold onto it. Salt your food normally or a little more than normal during the load and keep drinking. Loading on carbohydrate while under-hydrating leaves you with less than you think.
Doing this for the first time on race week. See below.
Practice It First
This is the piece I’d most like you to take from this post.
Pick a day well before race week and do a trial run. Eat a loading day, then ride the next morning. You’ll learn three things: whether you can actually hit your number, which foods sit well in volume, and how your gut handles it.
Almost everyone discovers something. Usually it’s that the number is harder to reach than expected, or that a food they assumed would work doesn’t at that volume. Finding that out on a quiet Tuesday costs you nothing. Finding it out on race day costs you the race.
Race Week, Day by Day
Monday through Wednesday. Normal eating, normal carbohydrate intake, training getting short and easy. Nothing special. Start lowering fiber slightly on Wednesday.
Thursday — load day one. Ramp carbohydrate up toward your target. Low fiber. Short easy spin at most. Buy everything you’ll need for Friday and Saturday now, so race week doesn’t hand you a grocery problem.
Friday — load day two, the important one. Hit your full target. Keep fiber low. Spread it across five or six feedings. You’ll likely be at the Ice Cycle Expo at the Grand Traverse Resort — plan your food around that rather than relying on whatever’s available there. Pack what you need and eat on your schedule, not the expo’s.
Dinner Friday should be moderate in size and familiar. The enormous night-before pasta dinner is a tradition, not a strategy — if you’ve loaded properly across both days, you don’t need a massive final meal, and a lighter dinner means you sleep better and start Saturday without a brick in your stomach.
Lay out your kit, fill your bottles, and prep breakfast Friday night. Race morning should require no decisions.
Saturday. Breakfast three hours before your wave, familiar and carbohydrate-focused, low fiber and low fat. Then execute the on-course plan you’ve already practiced.
Your Action List
- Calculate your number — body weight in kg times 8 to 10.
- Schedule a practice loading day and actually do it, well before race week.
- Write the grocery list and buy the shelf-stable items early.
- Decide your Friday eating schedule in advance, including around the expo.
- Plan race-week training to be genuinely easy. Put it on the calendar so you don’t improvise your way into a hard Thursday.
- Decide now that you’re not weighing yourself during race week.
Carb loading is one of the few nutrition interventions in endurance sport with genuinely strong evidence behind it. It’s also one of the easiest to botch through enthusiasm. Two days, a real taper, familiar low-fiber food, and a number you’ve actually calculated. That’s the whole thing.
Coming up next: race week and race morning. The taper-week eating that doesn’t undo your work, the night-before plan, breakfast timing by wave, and exactly what goes in your pockets before you roll out of Kalkaska.
Gina Render is a certified Performance Nutrition Coach that works with a variety of athletes and active individuals both locally and remotely to help them meet their goals. As a wife, mom of two teens avid mountain biker, and strength athlete, she understands the demands that come with balancing life and sport. From sport-specific fueling to general nutrition, she’s your partner and advocate to empower you to Adventure More. Contact her at gina@adventure-more.com.