The last week before your marathon is as much about what’s on your plate as what’s on the road. Yet most runners settle for a vague “eat pasta the night before” — and discover on race day that it’s not enough. A proper marathon week meal plan is built on a multi-phase nutritional strategy, with physiological logic behind every choice.
Here, I’ll give you the key principles: how to structure your week, the mechanics of carb loading, the foods to target, and those to eliminate. You’ll understand the why behind every decision. The how much — tailored to your profile — is another story, and I’ll explain how to get it at the end of this article.
Table of Contents
- Why Race Week Is a Game-Changer
- Carb Loading: How It Works and What the Research Says
- Two Phases, Two Strategies: D-7 to D-4 and D-3 to D-0
- The Best Foods, Day by Day
- What You Must Cut Out
- The Night Before: The Smart Pasta Party
- Race Morning Breakfast
- Hydration: The Hidden Performance Factor
- Mistakes That Wreck Your Pre-Marathon Week
- How Ograal Personalizes This for You
- FAQ
You’ve logged dozens of long runs, stacked tempo sessions, battled fatigue and self-doubt. Now there are seven days left. Seven days in which good nutrition can make as much difference as an extra week of training — or, handled poorly, leave you at the start line running on half-empty tanks.
I’m Ingrid Gallerini, a sports dietitian specializing in endurance sports, and I’ve been guiding athletes through Ograal for years. What follows is the exact guide I share with every athlete as their marathon approaches.
1. Why Race Week Is a Game-Changer
The week before a marathon is your supercompensation window. After months of training, your body has become an exceptionally efficient machine for storing and burning energy. But that machine has one hard limit: muscle glycogen stores. On race day, you’ll need every gram, right to the final stride.
What you eat this week won’t “bulk up” your muscles in the aesthetic sense. It will literally fill the fuel tanks. And full tanks are the difference between finishing strong and hitting the wall at mile 20.
Runners who neglect this week arrive at the start line with incomplete stores. Those who nail it arrive glycogen-loaded, ready to run every kilometer at their best. If you also race shorter distances, the same fundamentals apply — I cover them in detail in my guide to half-marathon nutrition.
2. Carb Loading: How It Works and What the Research Says
Glycogen is how your body stores glucose in your muscles and liver. It’s your premium fuel for intense, prolonged effort. The body naturally stores around 400–500 g — roughly 1,600–2,000 kcal. For a marathon that can burn 2,500–3,000 kcal, you can already see the problem.
Carbohydrate supercompensation is the process of pushing those stores well beyond their normal ceiling — up to 800 g–1 kg of stored glycogen under optimal conditions. The mechanism: combine a progressive reduction in training volume (tapering) with a significant increase in carbohydrate intake over the final 3–4 days. Sports physiology research confirms that a high-carbohydrate diet over 3–5 days combined with reduced exercise produces a measurable, significant increase in muscle glycogen stores.
In concrete terms, studies show a 2–3% performance improvement in events run to full effort — and roughly a 20% delay in exhaustion for efforts lasting more than 90 minutes. For a marathon runner targeting a specific finish time, that is far from negligible.
Important note: every gram of stored glycogen binds 3 g of water. You will gain a little weight this week. That is not only normal — it’s a good sign.
3. Two Phases, Two Strategies: D-7 to D-4 and D-3 to D-0
Phase 1 — D-7 to D-4: Elevated Baseline Eating
During the first four days of the week, you are not yet in loading mode. You continue light training (a few easy short runs, nothing intense) and maintain balanced eating with a normal level of complex carbohydrates. The goal: avoid disrupting your body, maintain the micronutrient and vitamin intake that supports recovery and immune function.
This phase is also the time to start phasing out high-fiber and digestively risky foods. Begin reducing irritating fiber, remove legumes from your plate, and set aside raw vegetables in large quantities. If you’re still training in the evenings early in the week, consider a well-timed pre-workout snack to keep your energy up without burdening digestion.
Phase 2 — D-3 to D-0: The Carb Load Itself
From D-3 (Wednesday or Thursday, depending on whether your marathon is on Sunday), the protocol shifts. Training drops to nearly zero. Your plate, on the other hand, climbs in carbohydrates. The target: 70% of your total caloric intake from carbs. White rice, al dente white pasta, white sandwich bread, steamed potatoes, applesauce, ripe bananas, honey — easy-to-digest carbohydrates now dominate the plate.
At the same time, reduce fat and protein — not because they are harmful, but because the plate needs room for carbs, and because fat and protein slow gastric emptying. That’s precisely what you don’t want when you’re trying to store efficiently and quickly.
4. The Best Foods, Day by Day
D-7 to D-4 — The Elevated Balanced Plate
- Starchy carbs at every meal: brown or semi-wholegrain rice, al dente pasta, quinoa, sweet potato
- Lean protein: chicken, turkey, white fish, eggs
- Cooked vegetables (preferred): carrots, green beans, zucchini, spinach
- Quality fats in moderate amounts: olive oil, rapeseed oil, a small handful of nuts
- Plain dairy (yogurt, fromage blanc) for probiotics and calcium
- Fresh whole fruit or unsweetened applesauce
D-3 to D-1 — The Carb Loading Phase
- White rice, white pasta, white sandwich bread, semolina, boiled potatoes
- Lean protein in moderate portions: chicken breast, turkey breast, sliced ham, white fish
- Cooked vegetables only, in small quantities — and without skin
- Moderate-GI fruit: ripe banana, unsweetened applesauce, clarified fruit juice
- Honey or jam on toast for a quick, easily digestible carb boost
- Carbohydrate-based desserts: rice pudding made with skimmed milk, semolina pudding, warm applesauce
- Recovery drinks or maltodextrin if you already use these products in training
5. What You Must Cut Out
Here is the pre-marathon blacklist. No drama — just strategy:
- Legumes (lentils, chickpeas, dried beans): guaranteed intestinal fermentation under effort
- Raw vegetables in large quantities, and high-fiber vegetables (cabbage, broccoli, leeks, raw onions)
- Fatty meats, fatty cured meats, aged cheeses, and rich sauces
- Alcohol: a vasodilator, sleep disruptor, and diuretic — the perfect trio to undermine your preparation
- New foods: never in race week. Your gut relies on its routines, not experiments
- Strong spices, overly rich exotic dishes, fast food
- Excess coffee or tea — two cups per day maximum, and never on an empty stomach
- FODMAPs (fermentable sugars found in garlic, onions, raw apples, and certain dairy products) are also worth monitoring if you have a sensitive gut. The goal: arrive on race day with a calm, cooperative digestive system — not one dealing with silent inflammation from a poorly planned pasta party.
6. The Night Before: The Smart Pasta Party
Saturday night pasta is a marathon tradition — but many athletes turn it into a trap. I’ve written a full article on the pre-race dinner for endurance athletes, and the main message is simple: this dinner should not be the biggest meal of your week.
At D-1, your body has already been loading for two days. Dinner should be early — ideally 12 hours before the start if possible, and no later than 8 pm. It should be:
- Rich in moderate-to-low GI carbohydrates: al dente white pasta, white rice, semolina
- Lightly protein-rich: a modest portion of white meat or white fish, or a few slices of ham
- Almost fiber-free: no green salad, no raw vegetables, no pulses
- Almost fat-free: a drizzle of olive oil is enough — forget rich sauces
- Alcohol-free — even one glass of wine, even “to take the edge off”
A generous bowl of pasta, a chicken breast, some cooked carrots, applesauce, and water: that’s an effective pasta party. No need to feast.
7. Race Morning Breakfast
This meal is critical and often rushed in the stress of race morning. Golden rule: eat 2.5–3 hours before the start. Not less.
Race morning breakfast has two goals: replenish hepatic glycogen stores (drawn down overnight) and provide priming fuel without overloading the digestive system.
- White sandwich bread or white baguette with honey or jam (minimal butter)
- Oats or muesli without nuts or dried fruit — cooked if you have a reactive gut
- Ripe banana: quick carbs, potassium, easy to digest
- Coffee or light tea if you’re used to it — no changes to your routine
- A glass of clarified fruit juice (no pulp)
- Optional: your usual energy bar, pain d’épice (gingerbread)
What to avoid on marathon morning: scrambled eggs with butter, cheese, juices with pulp, nuts and seeds, fiber-loaded protein smoothies. Anything that demands significant digestive effort.
Between breakfast and the start, keep sipping water. In the 15–30 minutes before the gun, a small hit of fast carbs (gel, banana, a few dates) can help stabilize blood sugar.
8. Hydration: The Hidden Performance Factor
We talk a lot about what to eat during this week. We talk far too little about what to drink. Yet hydration is at least as important a performance factor as carb loading — and intimately connected to it.
A physiological reminder: to store 1 g of muscle glycogen, your body needs 3 g of water. In other words, a proper carb load simply doesn’t work if you’re dehydrated. Water is not an optional extra in marathon week — it’s a co-substrate of the storage process. If your race takes place in warm weather or in spring, hydration becomes even more critical. My detailed advice on hydration in hot conditions applies fully to running in those circumstances.
- Target a minimum of 2 liters of water per day, ideally 2.5 liters
- Spread your intake in small, regular amounts throughout the day
- Choose mineral water slightly rich in sodium and magnesium
- Limit coffee and tea to 2 cups per day — their mild diuretic effect can undermine net hydration
- Avoid sugary soft drinks and alcoholic beverages
A reliable indicator: urine color. Pale straw to light yellow = good hydration. Dark yellow or amber = drink more. Colorless = you’re over-drinking, which can dilute electrolytes.
9. Mistakes That Wreck Your Pre-Marathon Week
Mistake #1: Overeating from D-7
Carb loading starts at D-3, not D-7. Dramatically increasing carbohydrate intake seven days out doesn’t trigger supercompensation — it causes heavy digestion, bloating, and unnecessary weight gain. Be patient: the final three days are what matter most.
Mistake #2: Testing New Foods
Marathon week is not the time to try the new artisan bakery, legume-based pasta, or fermented sheep’s milk yogurt. Your gut has its habits — respect them. Anything unfamiliar can trigger an unpredictable reaction.
Mistake #3: Neglecting Hydration
Many runners eat well but drink too little. The result: glycogen stores less efficiently, and performance drops from the opening miles. Drinking regularly throughout the day is just as important as filling your plate with carbs.
Mistake #4: Eating Too Little Because You’re Training Less
Tapering reduces training volume — it doesn’t reduce your energy needs for the loading process. Just because you’re running less this week doesn’t mean you should eat less. On the contrary, this is the moment to increase carbohydrates while keeping your overall caloric intake stable.
Mistake #5: A Late and Excessive Pasta Party
Dining at 10 pm the night before with three plates of pasta in a creamy sauce is a recipe for arriving at the start line with your stomach still working. Eat early, eat enough but not too much, and keep your meals simple and well cooked.
Mistake #6: Ignoring Cramps and Waiting Until Race Day
Cramps don’t start during the race — the groundwork (or the damage) is laid in the days before. Insufficient hydration and a lack of magnesium or sodium can cause real problems. Some athletes also use pickle juice for cramp prevention as a race-day strategy — worth looking into if you’re prone to muscular cramps late in a race.
10. How Ograal Personalizes This for You
Every principle I’ve described here is universal — but the application is individual. A 55 kg runner targeting 3:30 has very different needs from an 80 kg athlete aiming for 4:00. A sensitive stomach demands adjustments that a cast-iron gut doesn’t need. And a first-time marathoner approaches carb loading with far less experience than someone with ten races in their legs. That’s precisely why Ograal exists. The app generates a fully personalized nutrition plan calibrated to your weight, goal pace, eating habits, and digestive tolerance. No gram counting, no second-guessing whether you’re eating enough — Ograal handles it.
And if you’re also preparing a triathlon alongside your marathon, know that these same carb-loading principles apply in full — with a few nuances specific to the format. I cover them in the guide to triathlon race-week nutrition.
In the week before your marathon, you have nothing left to prove in training. Everything you can still do is prepare intelligently. And it starts on your plate.
FAQ — Frequently Asked Questions
How many days before a marathon should you start carb loading?
The true carb-loading phase begins 3 days before the marathon (D-3). This is the optimal window to maximize glycogen storage without triggering digestive issues. Some extended protocols start at D-4 or D-5 with a gradual increase in carbohydrates. However, starting a heavy load at D-7 or D-6 provides no additional benefit and brings more downsides: heavy digestion, bloating, and premature weight gain.
Can you carb load without eating pasta?
Absolutely. White pasta is the iconic carb-loading food, but it’s not a requirement. White rice, wheat semolina, steamed potatoes (without skin), white sandwich bread, well-cooked oats, well-cooked sweet potato — all of these are excellent sources of easy-to-digest carbohydrates and perfectly suited to the loading phase. What matters is the form: moderate-to-low GI carbohydrates, well cooked, with minimal added fiber and fat. If you are gluten-intolerant, white rice and potatoes are your best allies.
What should you eat on marathon morning?
Race morning breakfast should be taken 2.5–3 hours before the start. It should be high in easily digestible carbohydrates, moderate in protein, and low in fat and fiber. White bread or sandwich bread with honey or jam, well-cooked oats, a ripe banana, coffee or tea if that’s your habit — those are the fundamentals. Most importantly: test nothing new that morning. Eat what you’ve practiced on your long training runs. Your gut needs familiar territory.
Does carb loading cause weight gain?
It causes weight gain — yes — but not fat. Every gram of glycogen stored in muscle brings 3 grams of water with it. A proper carb load can therefore result in a 1–3 kg increase on the scales in the days before the marathon. This is a sign that the protocol is working and that your stores are building correctly. That extra weight will be mobilized and burned during the race — and it is far preferable to empty stores that send you into the wall at mile 20.
Should you stop exercising completely the week before a marathon?
Not entirely, but training must be drastically reduced — that’s the essence of tapering. Early in the week (D-7 to D-5), two or three short, easy runs are fine. From D-4 or D-3, it’s better to limit physical activity to very light, brief sessions or simply walking. The dual purpose of tapering: let the muscles recover fully and allow glycogen to accumulate without being consumed. A hard session at D-3 or D-2 can undo in a few hours what three days of targeted nutrition built up.
Should you eat differently if the marathon is in the morning versus the afternoon?
Yes — the race start time changes the logic of both your breakfast and your dinner the night before. For an early start (8–9 am), the previous evening’s dinner carries even more weight, since it’s your last substantial meal before the race — it should be eaten early and be generous. For an afternoon start (2–4 pm), you have the option of a real carb-rich lunch about four hours before the gun, in addition to your usual breakfast. In all cases, work backwards from your start time when planning the timing of each meal.
— Ingrid Gallerini, sports dietitian specializing in endurance, voice of Ograal.
Sources: Bergström & Hultman (1966), Frontiers in Physiology — Glycogen Supercompensation Meta-analysis (2025), PubMed — Carbohydrate-loading and exercise performance (1997), Nutrients — Carbohydrate Supplementation Review (2025). frontiersin.org/fphys.2025 | pubmed.ncbi.nlm.nih.gov/9291549 | pmc.ncbi.nlm.nih.gov/PMC11901785
