Pre-Race Carbohydrate Loading: The Modern Version Doesn't Require Depletion First—A Coach's Guide to Calculating the Right Carb Dose Per Kilogram

Coach’s Opening: The Athlete Who Wrecked Himself the Week Before a Race

I’ve coached triathletes for over fifteen years, from office workers tackling their first 51.5-distance race to veterans who’ve earned Kona slots. Over the years, what’s left the deepest impression on me—and what I most want to write down to warn others about—isn’t some advanced training method, but a “generational gap in fueling philosophy.”

A few years ago, one of my athletes—let’s call him A-Jhe—was taking on his first Taitung 226. He’d done his homework, digging up a “classic carbohydrate loading method” passed down from the 1960s: one week before the race, do a long depletion workout first, then eat low-carb for three days, barely touching any starch, pushing the body to the brink of running on empty, and finally cramming carbs for the last three days. The theory was that the muscles, after being “starved,” would overcompensate and pack in more glycogen than usual.

So what happened? During those three low-carb days, A-Jhe felt like his soul had been sucked out of him. He couldn’t push on the bike, was irritable, slept poorly, and during one workout, his blood sugar dropped so low he nearly zoned out riding along Highway 11. By the time he was supposed to start carb-loading, his immune system was already a mess, and his throat was starting to hurt. On race day, his glycogen stores were indeed full, but his overall “state” was shattered.

After that, I made up my mind: I would personally oversee every athlete’s pre-race fueling. Because modern sports science has long told us: to achieve glycogen supercompensation, you don’t need to deplete yourself first. In this article, I’ll explain this clearly from the practical perspective of coaching athletes.

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Foundational Concepts: What Glycogen Actually Is and Why “Supercompensation” Matters

Glycogen Is Your “On-Board Fuel Tank”

Let’s start with the basics. The carbohydrates we eat are partly stored as glycogen in our muscles and liver. Think of it as the body’s on-board fuel tank:

• Muscle glycogen: Supplies the working muscles directly and is the primary fuel for endurance exercise.
• Liver glycogen: Maintains blood sugar stability, supplying the brain and nervous system.

A trained 70 kg person can store roughly 350 to 500 grams of glycogen in muscle, with the range falling between 300 and 700 grams depending on fitness and dietary habits. That sounds like a lot, but converted to calories, it’s only around 1200 to 2000 kcal—for an ultra-endurance event that easily lasts four or five hours, or even the back half of a marathon, that tank will hit empty.

The Physiological Truth Behind “Hitting the Wall”

Many people doing marathons or long rides encounter “hitting the wall,” which typically occurs after the 30 km mark or once exercise exceeds 90 minutes. That sudden feeling of leaden legs, a brain that shuts down, and a pace that falls apart is largely muscle glycogen being drained dry.

So the goal of “glycogen supercompensation” (or carbohydrate loading) is simple: before the race, fill that tank fuller than usual, so you can go longer before running dry. Research generally agrees that this only truly matters for endurance events lasting over 90 minutes—if you’re just running a 10 km and finishing in 40 minutes, you probably don’t need to go to the trouble of supercompensating.

Why Does “Supercompensation” Work?

The key lies in a property of muscle cells: when glycogen is depleted and then replenished, the body activates a “compensation mechanism” that ramps up glycogen synthase to a more active state, allowing the muscle to pack in more glycogen than before. That’s where the term “supercompensation” comes from.

But here’s the crucial point—to trigger this compensation mechanism, you don’t need to deplete glycogen to near-empty first. This is the biggest difference between the classic and modern versions.

Why Can You Fill Up “Without Depleting First”?

Many athletes pause here: “Coach, if we don’t empty out the glycogen first, where does the muscle get the space to store more?” That’s a good question, and I’ll explain it with an analogy.

Imagine your muscle glycogen storage is a “flexible warehouse,” not a fixed-size iron box. When you eat large amounts of carbohydrates for several consecutive days while cutting back on training, the warehouse itself gets bigger—muscle glycogen synthase stays in an active state, and insulin signaling keeps shuttling glucose into the muscle cells. In other words, what determines how much glycogen you ultimately store is the environment of “sustained high-carb intake + low expenditure,” not “whether you starved yourself first.”

Early scientists included a depletion phase because, in the experimental designs of that era, depletion did create a more pronounced supercompensation contrast. But subsequent research gradually found: for an athlete who trains regularly and has good muscle metabolic capacity, simply relying on high carbs + reduced training can push glycogen close to its ceiling. The extra depletion phase not only adds no benefit, but also brings side effects like immune suppression, low mood, and increased injury risk. From a return-on-investment perspective, the classic depletion method is “paying a huge cost without buying any more return.”

That’s why, in all my years coaching, I almost never let anyone go through that depletion protocol anymore—the risks far outweigh the benefits.

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Classic vs. Modern: A Table to See the Difference at a Glance

In the 1960s, Swedish researchers discovered the glycogen supercompensation phenomenon and proposed the earliest “classic six-day method.” This approach circulated in textbooks for decades and was the version A-Jhe followed back then. But research over the past twenty to thirty years has continuously refined it, and the modern version is far simpler and gentler.

Here’s a side-by-side comparison:

Item	Classic Six-Day Method (from the 1960s)	Modern Refined Method (last two decades)
Depletion phase	Required, starting with a long depletion workout	Not needed
Low-carb phase	Yes, roughly 3 days of strict low-carb before the race	Eliminated
High-carb phase duration	Last 3 days	1 to 3 days is sufficient
Training schedule	Depletion + gradual tapering	Pure tapering, easy or rest
Carb dose per kg	High during the carb-loading phase, but starving early on	8–12 g/kg/day during the high-carb phase
Psychological & immune state	Often low mood, prone to colds, irritable	Relatively stable, good spirits
Suitable for	Largely obsolete	Nearly all endurance athletes

See the difference? The modern version cuts out the entire “depletion phase + low-carb phase”—the most painful, morale-crushing, cold-inducing part.

According to the International Society of Sports Nutrition (ISSN), muscle glycogen stores can be maximized through a high-carb diet of 8 to 12 grams of carbohydrate per kilogram of body weight per day, combined with training reduction, maintained for 1 to 3 days, without the need for a prior depletion phase. (Source listed in the references at the end.)

Some researchers have even proposed a more aggressive “one-day rapid method”: do a very short, near-maximal high-intensity sprint (about 2 to 3 minutes) the day before the race, then consume roughly 10 to 12 g/kg of high-glycemic carbs over the following 24 hours, and muscle glycogen can nearly double. This is an option for athletes short on time or who don’t want to carb-load for three days straight—but for most amateur athletes, I still lean toward the gentler 1 to 2-day version, as it’s less prone to error.

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The Core Numbers: How Many Carbs Per Kilogram of Body Weight

This is the part I get asked about most when coaching, and the one most often done wrong. Many people “feel” like they’re eating more starch, but when you actually calculate it, the amount simply isn’t enough.

First, Learn to Calculate Your Target Dose

The modern golden range for carbohydrate loading is 8 to 12 grams of carbohydrate per kilogram of body weight per day. Here’s how I typically break it down:

• Beginner / first-time Ironman or half-marathon athletes: Aim for 8 g/kg, prioritizing stability and avoiding GI distress.
• Intermediate / experienced long-distance athletes: Aim for 10 g/kg, the most common middle-ground value.
• Advanced / ultra-distance or full-marathon athletes chasing a PR: Can go up to 10–12 g/kg, but only after practicing gut tolerance beforehand.

Take a 65 kg female athlete as an example, calculated at 10 g/kg:

65 kg × 10 grams = 650 grams of carbohydrate / day

What does 650 grams of carbs look like? Converted to calories, that’s roughly 2,600 kcal (1 gram of carbs ≈ 4 kcal), and that’s just the carbohydrate portion. Many athletes are shocked when they hear this—“I probably don’t even eat 300 grams on a normal day!” Exactly—that’s why people who don’t deliberately track and just rely on feel almost never consume enough.

Quick-Reference Carb Targets by Body Weight

I’ve made a table so you can look it up directly. The numbers below are daily total carbohydrate amounts (in grams), not per meal:

Body Weight	8 g/kg (Beginner)	10 g/kg (Intermediate)	12 g/kg (Advanced)
50 kg	400 g	500 g	600 g
60 kg	480 g	600 g	720 g
70 kg	560 g	700 g	840 g
80 kg	640 g	800 g	960 g
90 kg	720 g	900 g	1,080 g

Important reminder: These are “grams of carbohydrate,” not “grams of food.” One bowl of white rice (about 200 g cooked) contains roughly 55 to 60 grams of carbs, not 200 grams of carbs—a point many people get confused about.

Practical Conversions for Taiwanese Athletes—You Can Hit the Target Even Eating Out

Living in Taiwan is actually a blessing—carb-loading ingredients are everywhere. When I help athletes calculate their doses, I often use these easy-to-understand local conversions (carb content is approximate):

Common Taiwanese Food	Portion	Approx. Carbs
White rice	1 bowl (200 g cooked)	55–60 g
White toast	1 slice	15–18 g
Medium steamed bun (mantou)	1 piece	45–55 g
Banana	1 medium	25–30 g
Sweet potato	1 (about 150 g)	30–35 g
Sports drink	500 ml	25–35 g
White congee	1 large bowl	40–50 g
Rice noodles / ho fun	1 serving	50–60 g

Using this table, let’s revisit that 65 kg woman who needs 650 grams of carbs. She can easily hit the target with roughly 4 bowls of rice + 2 bananas + 1 sweet potato + a few sports drinks during the day, plus some toast as a snack. Taiwan’s convenience stores, noodle shops, and bento shops make it easy to top up anytime—that’s an advantage we have over athletes in many other countries.

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Practical Method: A Sample 36-Hour Carb-Loading Schedule

Talking about numbers alone is too abstract, so let me give you a “36-hour pre-race carb-loading timeline” I commonly use. Let’s assume the race starts at 7:00 AM on Sunday. We begin ramping up carbs from Friday evening, with the main push falling on all of Saturday.

Example: 60 kg Athlete, Target 10 g/kg (600 g Carbs/Day)

Time	Content	Approx. Carbs
Friday dinner	Large bowl of white rice + low-fat protein (chicken breast/white fish) + low-fiber vegetables	90–100 g
Saturday breakfast	3 slices of white toast + 1 banana + 500 ml sports drink	90–100 g
Saturday morning snack	1 steamed bun + fruit juice	70–80 g
Saturday lunch	1.5 bowls of white rice + low-fat bento sides (avoid fried foods)	100–110 g
Saturday afternoon snack	1 sweet potato + 500 ml sports drink	60–70 g
Saturday dinner	1 serving of white congee / noodles + mild protein	90–100 g
Saturday before bed	1 banana + a small amount of toast	40–50 g

That brings the daily carb total to roughly 540 to 610 grams, right on target.

How Carb Loading Connects with the “Taper Week”

Many athletes treat “carb loading” and “tapering” as two separate things, but they actually work together. Tapering means gradually reducing training volume before the race to let the body recover from fatigue; carb loading takes advantage of that late-taper window when training volume is very low and glycogen depletion is minimal to fill the tank. Combined, they form a complete pre-race preparation.

Here’s how I typically structure the final week (using a Sunday race as an example):

Days Before Race	Training	Nutrition Focus
Monday (6 days out)	Moderate volume, keep intensity, cut volume	Normal balanced diet
Tuesday (5 days out)	Easy + a little intensity reminder	Normal balanced diet
Wednesday (4 days out)	Easy short session	Slightly increase carb ratio
Thursday (3 days out)	Very easy or rest	Start paying attention to carbs, reduce high-fiber foods
Friday (2 days out)	Very easy 15–20 min or rest	Officially enter carb loading, increase carbs
Saturday (1 day out)	Complete rest or 10 min easy spin	Main carb-loading day, low-fiber refined carbs
Sunday (race day)	Race	Eat a practiced breakfast 2–3 hours before

You’ll notice that the two carb-loading days fall right at the tail end of the taper week—when training volume is lowest and the body burns the least glycogen, making it the golden window to fill the stores. This again confirms: the modern method doesn’t require a separate depletion day to “create space”; the taper itself sets up the conditions.

Three Key Principles for Execution

First, choose “low-fiber, easily digestible” carbs. In the 24 to 36 hours before the race, I ask athletes to set aside high-fiber foods like brown rice, whole wheat, large salads, and beans, and switch to refined carbs that digest easily—white rice, white toast, white congee, bananas, and sports drinks. The reason is practical: high fiber adds GI burden on race day and sends you running to the bathroom—the last thing an ultra-distance or full-marathon athlete wants.

Second, actually taper your training. During these carb-loading days, training volume should be very low—just an easy 20 to 30 minutes to stay loose, or even complete rest. You want your muscles to “store,” not keep burning. This is where the modern method is smarter than the classic approach: no depletion, just reduction.

Third, don’t experiment with new foods on the last day. I drill this into every athlete: race week is not experiment week. All carb-loading foods should have been tested before your regular long training sessions. Taiwan’s summers are hot and humid (especially for races in the east or south), and the gut is already prone to acting up—eating something you’ve never tried at that point is gambling.

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Mental Preparation for Water Weight Gain: Why You’ll “Get Heavier”

I need to spend some time on this section because every year, athletes weigh themselves before the race, panic, and throw themselves off their game.

Glycogen Stores Water Along With It

This is a physiological fact many people don’t know: for every 1 gram of glycogen stored, your muscles simultaneously lock in at least 3 grams of water. (Source in references at the end.)

What does this mean? Let’s do the math for you:

Suppose you store an extra 400 grams of glycogen through carbo-loading,
you’ll also lock in roughly 1,200 grams (1.2 kg) of water,
just from carbs alone, the scale could show 1.5 to 1.6 kg more.

In some research scenarios, when hydration is very adequate, the water-to-glycogen ratio can be even higher, making weight fluctuations more pronounced. So if you’ve done a proper carbo-load, gaining 1 to 2 kg in the day or two before race day is completely normal—and a good sign—that’s not fat gain; it means your fuel tank and coolant are both topped off.

The Mental Pitfall Coaches Most Want to Correct

I’ve coached many athletes—especially women who are very numbers-conscious and men chasing performance—who step on the scale before a race, see “+2 kg,” and start panicking, even considering eating less or cutting fluids on the spot. That is a huge mistake.

Please understand that 1 to 2 kg this way:

• It’s fuel, not fat. It will be burned off bit by bit during your race.
• The water bound to glycogen gets released when you sweat heavily or in hot weather (which is almost every race in Taiwan), helping you maintain hydration and fight off dehydration—it’s like carrying your own coolant.
• A few days after the race, that water weight naturally subsides and doesn’t become permanent weight.

I often tell my athletes: “Those two extra kilos on the scale are the endurance you’ve earned through effort, not your enemy.” Keep that in mind, and you won’t panic when you step on the scale before race day.

Water and Sodium—The Hidden Partners of Carbo-Loading

Since glycogen locks in water, hydration becomes crucial during the carbo-loading period. I always remind athletes: carbo-loading isn’t just about carbs—you need to bring in water and electrolytes too, so glycogen stores properly and you don’t end up dehydrated before the race.

A few practical points:

• Drink normally, don’t force it: During carbo-loading, just drink according to your usual thirst cues; keep urine a light yellow. No need to chug water to “help glycogen lock in water”—that could dilute blood sodium and send you running to the bathroom.
• Supplement sodium moderately: Taiwan races are generally hot and humid. Including moderate salt in your diet (e.g., noodle soup, miso soup, sports drinks) in the day or two before helps your body retain water. This is especially meaningful for “salty sweaters”—athletes who sweat heavily and show visible salt crystals.
• Use sports drinks for two birds with one stone: Sports drinks provide carbs, water, and electrolytes all at once, making them a convenient tool during carbo-loading. That’s why I often schedule them into the plan.

Take care of carbs, water, and sodium together, and your body will be in optimal shape before the race—“fuel topped off, water topped off, electrolytes in place.”

Second Case Study: The Female Athlete Afraid of Gaining Weight

Let me share another case, very different from A-Zhe’s. I coached a female athlete attempting the Taipei Marathon full distance—let’s call her Xiao-Rong. She was very sensitive about her weight. The first time I told her carbo-loading would add 1–2 kg, her face fell, and she said, “No way, I don’t want to get heavier.”

I didn’t push her. Instead, I took time to explain the principle that “water weight isn’t fat,” and showed her the math of 3 grams of water per gram of glycogen. Then I asked her to do a small experiment: before a 30 km long run, follow a mild carbo-loading protocol, log her weight change, and note how she felt while running.

Her report afterward: “The weight was indeed up by over 1 kg, but wow, that heavy-legs feeling in the latter part barely showed up—I could even hold my pace.” From then on, she was fully on board. On Taipei Marathon day, she was up about 1.3 kg, but ran a personal best, and within two or three days after the race, the water weight naturally subsided and her weight returned to baseline. Her biggest takeaway wasn’t the PB—it was finally no longer treating pre-race weight gain as an enemy.

I really want to share this case because there are many athletes—especially women—who avoid carbo-loading out of fear of gaining weight. Please remember: that’s the deposit you pay for endurance, and it gets refunded after the race.

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Common Mistakes and Fixes: The Five Pitfalls Coaches Catch Most Often

These are issues I’ve repeatedly seen in athletes over the years. Let’s break them down one by one:

Mistake 1: Thinking “Just Eat More,” but Loading Up on High-Fat, High-Fiber Foods

Many people hear “carbo-load” and go straight for braised pork rice, fried chicken, steak, and big salads. The problem is these foods are too high in fat and fiber, with insufficient carb proportion, and they slow digestion.

Fix: Carbo-loading is about “total carbs,” not “total food.” Choose white rice, noodles, white toast, bananas, and sports drinks—foods with high carb density and easy digestibility. Save fried foods and large raw salads for after the race.

Mistake 2: Still Doing the Outdated “Depletion + Low-Carb” Method

Like A-Zhe at the beginning, following decades-old methods of emptying out and starving first, ending up with a suppressed immune system and low mood.

Fix: Skip the depletion phase and go straight to high-carb + tapering. Modern research has confirmed you don’t need to starve first—results are just as good, and you’ll stand at the start line feeling fresh and sharp.

Mistake 3: Only Eating One Big Meal, or Cramming at the Last Minute

Some athletes remember to carbo-load on Saturday night, binge one huge meal, and think they’re done. A single meal simply can’t pack in enough glycogen.

Fix: Carbo-loading is a full-day, multi-meal effort. Split your target carb amount across 5 to 6 meals (including snacks) evenly—easier on the stomach and better absorbed.

Mistake 4: Still Training Hard During the Carbo-Load Period

Not wanting to cut back, athletes go out for long runs or intervals during carbo-loading days, burning glycogen as they load—essentially wasting the effort.

Fix: During those 1 to 3 days of carbo-loading, genuinely taper—easy activity or rest, so glycogen has a chance to accumulate. Trust your prior training; being lazy before the race is the right call.

Mistake 5: Fasting or Cutting Fluids When the Scale Goes Up

As mentioned earlier, this is the most damaging one.

Fix: A 1–2 kg weight gain is a sign of successful carbo-loading—don’t touch it. Keep eating carbs and drinking fluids normally, and treat that water weight as your endurance asset.

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Actionable Advice for Athletes of Different Levels

Everyone’s target race, experience, and stomach condition differ. Here are three concrete approaches by level:

First-Timers: First Triathlon / First Half Marathon / First Marathon

• Dose: Go conservative at 8 g/kg, prioritizing stability and avoiding mishaps.
• Duration: Just 1 to 2 days before the race with higher carbs—no need to overcomplicate.
• Focus: Stick to familiar foods. White rice, bananas, toast, and sports drinks are your best friends.
• Mindset: Your primary goal is to finish, not to max out glycogen. Seven or eight out of ten effort is plenty.

Intermediate: Athletes Looking to Set a Personal Record

• Dose: 10 g/kg, using the quick-reference table above to calculate your daily carb target precisely.
• Duration: Start 2 days before, with the main focus on the full day before the race.
• Focus: Begin paying attention to “low fiber”—swap out high-fiber foods in the 24 hours before. All foods should have been rehearsed during training.
• Advanced tip: Pair it with a taper week, keeping the last two days’ training to a minimum.

Advanced: Long-Distance Triathlon / Marathoners Chasing Results

• Dose: 10–12 g/kg, but this amount is a significant gut load—you must rehearse it in a practice race beforehand.
• Duration: 2 to 3 days, or consider trying the “one-day rapid method.”
• Focus: Calculate down to every meal, and use sports drinks or energy gels to fill the carb gap that solid food can’t cover at high doses.
• Local note: Taiwan’s long-distance triathlons (e.g., Taitung 226, Penghu Cross-Sea) are mostly in hot, humid conditions—the water locked in by carbo-loading is actually your advantage against dehydration, so don’t fear those two kilos.

A Universal Reminder: Treat Carbo-Loading as Part of Training

No matter your level, I want you to fully rehearse the carbo-loading protocol before at least one important long training session. You need to know whether eating this many carbs causes bloating, bathroom runs, or how you feel riding/running the next day. By race day, this protocol should feel like “old hat,” not a first-time experiment.

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FAQ

These are the questions trainees ask me most often when I’m leading a group. I’ve compiled them all here for you.

Q1: Do I need to carb-load for a 51.5 standard-distance triathlon or a 10K road race?

Most people don’t need to go to great lengths. Carb-loading is mainly meaningful for endurance events lasting over 90 minutes. If your standard-distance triathlon finish time is under two hours, or your 10K is around 40–60 minutes, the glycogen you already have on board is usually sufficient. For these shorter races, eating normally the day before, bumping up your carbohydrate ratio a bit, and choosing easily digestible foods is plenty—there’s no need to deliberately push it to 10 g/kg.

Q2: I usually watch my sugar intake / follow a low-carb diet. Can I carb-load directly?

Yes, but you need to transition earlier and more gradually. If you’ve been low-carb long-term, your body’s tolerance for high carbohydrate intake needs time to readjust. I recommend extending the buildup to 2–3 days before the race and increasing gradually—don’t spike to maximum amounts in a single day, or your gut and blood sugar will both protest. If you have diabetes or any blood-sugar-related condition, you must consult your doctor first.

Q3: Do I need to completely cut out protein and fat during the carb-loading period?

No, you don’t need to, and it’s not recommended. Carb-loading means “raising the carbohydrate ratio,” not “eating only carbs.” Pairing each meal with moderate protein (chicken breast, white fish, eggs) and a small amount of fat is good—it helps maintain satiety and stable blood sugar. Just don’t let fat and fiber get too high, as they’ll crowd out room for carbs and slow digestion.

Q4: Will eating this much carbohydrate cause bloating or diarrhea?

It’s possible, which is why I keep emphasizing the need to rehearse beforehand. Ways to reduce the risk: choose low-fiber refined carbs, split intake across 5–6 meals, and use liquid carbs (sports drinks, juice) to share the burden from solid food. If you feel uncomfortable during practice runs, that means your dosage or food choices need adjustment—better to err on the conservative side.

Q5: Should I keep carb-loading at breakfast on race day?

The entire day before the race is the main carb-loading window. Race-day breakfast is “pre-race fueling,” which is a different animal. On race morning, eat the easily digestible carbs you’ve practiced with (e.g., white toast, bananas, plain congee), in amounts that won’t cause bloating or nausea—typically finishing 2–3 hours before the start. At this point, you’re not trying to stuff in more glycogen; you’re stabilizing blood sugar so you can stand at the start line feeling sharp.

Q6: Should I choose the one-day rapid method or the gentler two-to-three-day approach?

If you’re an experienced, advanced athlete with a strong stomach and you’ve practiced the protocol, the one-day rapid method saves time and works well. But for the vast majority of age-group athletes, I still recommend the gentler 1–2 day version—it leaves less room for error and creates less psychological stress. Remember, the last thing you want in race week is surprises. The simpler and more stable, the better.

Q7: If the race is postponed due to heavy rain or I have to skip it after carb-loading, is the glycogen wasted?

It’s not wasted, though it is a bit of a shame. Any extra glycogen you’ve stored that isn’t used in the race will be gradually consumed over the next few days through normal daily activity, and the water bound to it will be excreted as your weight returns to baseline. If the race is postponed by a day or two, you can maintain a higher-carb intake and keep doing light activity to preserve your state. If the postponement is long or you end up skipping the race, just return to your normal diet—no need to stress. Taiwan’s summer races occasionally get postponed due to typhoons or afternoon thunderstorms, so having that mental preparation in advance will keep you from panicking when things change on short notice.

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Coach’s Closing Thoughts

Back to A-Zhe from the opening. I later helped him prepare for his next 226, completely discarding the outdated depletion method and switching to the modern high-carb + taper approach. Throughout the entire week before the race, he ate well, slept well, and stood at the start line feeling sharp. His weight did go up 1.8 kg, but I’d already told him that was fuel and coolant. In that race, not only did he finish, but his late-race pace collapse was far less severe than last time—because his tank was genuinely full.

To every athlete reading this, I want to say: Pre-race glycogen loading has long since evolved past the point where you need to break yourself down first. All you need to do is:

1. Calculate your carbohydrate target correctly at 8 to 12 grams per kilogram of body weight;
2. Spread it across multiple meals over the 1 to 3 days before the race, choosing easily digestible carbs to top up;
3. Taper seriously—stop pushing training;
4. When you see the scale go up, smile and accept it—that’s your endurance reserve.

Get these four things right, and you’ll be able to stand on the start line with a full tank. This isn’t some mystical art—it’s exercise science that’s been repeatedly validated. You’re just using it correctly, at the right time.

One last thought: fueling is an extension of your training, not a last-minute cram session the night before the race. Treat carb-loading as part of your race preparation, rehearse it as seriously as you practice your pacing or tire changes, and you’ll find your late-race performance getting more and more stable. Here’s to your next race—may you hit the wall later than ever, or even cruise all the way to the finish, crossing the line with a smile.

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This article is for educational purposes and does not replace individual assessment by a physician, physical therapist, or nutritionist. Every athlete’s constitution, gastrointestinal tolerance, and medical history differ. If you have diabetes, kidney disease, or other chronic health conditions, please consult your doctor or sports nutritionist before undertaking any carbohydrate-loading strategy.

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References

• International Society of Sports Nutrition position stand: nutrient timing (including 8–12 g/kg glycogen loading and the one-day method discussion): https://pmc.ncbi.nlm.nih.gov/articles/PMC5596471/
• Carb Loading for Runners: Modern Protocols vs. Traditional Methods (modern vs. classic loading methods, per-kg dosing): https://runnersconnect.net/carb-loading-runners/
• Muscle Glycogen Assessment and Relationship with Body Hydration Status: A Narrative Review (glycogen and body water, ~3 g water bound per gram of glycogen): https://www.mdpi.com/2072-6643/15/1/155

Related Reading

• Pre-Race Glycogen Loading: The Modern Simplified Version Replaces the Painful Depletion Method
• The Science of Glycogen Loading: How to Properly Carbohydrate-Load Before a Race
• The Complete Guide to Pre-Race Glycogen Loading: How Modern and Outdated Methods Differ, Plus the Ten Most Common Reasons for Failure
• Carb-Loading Three Days Before a Race: A Complete Plan with Practical Examples