What To Eat Week Of Half Marathon? | Carb Loading Guide

A gradual increase in familiar, healthy carbohydrates over the 2-3 days before the race is the core strategy.

Maybe you have heard the stories: runners downing an entire pizza the night before a race or skipping carbs entirely to feel light on their feet. Neither approach serves your muscles well when 13.1 miles are on the schedule. The week of a half marathon is about steady preparation, not last-minute shock tactics.

The honest answer to what to eat the week of your half marathon is simpler than you might think. Nutrition experts generally recommend a two-part strategy: maintain balanced meals with plenty of healthy carbohydrates several days out, then tighten your choices to low-fiber, familiar foods in the final 24 to 36 hours. You want full glycogen stores and a settled stomach at the start line — and that comes from gradual shifts, not a single pasta dinner.

Why The “Pasta Dinner” Myth Falls Short

Many runners picture one epic carb-heavy meal the night before the race and assume they are set. The catch is that your muscles can only store so much glycogen at once. Packing in a giant bowl of pasta late on Saturday might leave you feeling bloated rather than fueled.

Sports nutrition guidance leans toward a gradual carb-loading window. Some experts suggest that for half-marathon runners racing over 90 minutes, carb loading should last for a full 24 hours. For those running under 90 minutes, emphasizing carbohydrates in the meal before the race is often sufficient.

The takeaway is that a sustained approach — adding extra carbs 2 to 3 days ahead — is generally more effective than a single heavy meal. Your body has time to absorb and store the fuel without the digestive stress of a sudden overload.

What Your Body Actually Needs During Race Week

The week before a half marathon is not a diet week. Your training volume may drop, but your carbohydrate needs climb. Many running resources recommend aiming for roughly 3 to 5 grams of carbs per pound of body weight in the several days before the race. That is a significant increase from a normal day for most people.

• Lean proteins every meal: Chicken, turkey, eggs, or fish alongside your carbs help maintain muscle without slowing digestion. Think of it as balance, not burger-style eating.
• Healthy fats in moderation: Avocado, nuts, and olive oil provide lasting energy, but high-fat meals can sit heavy. Keep portions small 2 to 3 days before race day.
• Hydration with electrolytes: Water is essential, but adding sports drinks or electrolyte tablets can maintain sodium and potassium levels as you increase carb intake.
• Low-fiber vegetables: Well-cooked carrots, green beans, or zucchini are easier to digest than raw broccoli or kale. The goal is fuel, not fiber bulk.

One practical note: alcohol and anything you have not eaten during a training run should be set aside during race week. New foods and drinks carry risk of stomach distress that no one wants at mile 8.

Building Your Race Week Meal Plan

A full week of meals can feel overwhelming, but the pattern is straightforward. Early in the week, your normal training diet works fine. By Wednesday or Thursday, start adding carbohydrate-rich sides like potatoes, rice, or quinoa alongside your usual protein and vegetables.

Sanford Health recommends focusing on healthy carbohydrates such as potatoes, whole grains, fruits, and vegetables, with lean proteins, as the core of your race week nutrition. A whole grain sandwich with lean protein, a banana with nut butter, or trail mix are excellent meal choices in the days leading up to the race. These options are familiar, easy to prepare, and well-tolerated by most runners.

The day before the race, shift to lower-fiber versions of your carbs. White pasta, white rice, and regular bread are more gentle on digestion than whole grain equivalents. Lentils, quinoa, and beans are good choices 2 or 3 days out, but should be avoided the day before the race due to their higher fiber content. The goal is a full tank with minimal digestive load.

This table shows a general pattern — your individual needs may vary depending on your body size, training volume, and personal tolerance. The key is that the carb increase feels gradual, not forced.

Common Mistakes Runners Make During Race Week

Even experienced runners occasionally slip up. The most frequent error is trying something new — a friend recommends a new energy bar or you grab oatmeal loaded with dried fruit and nuts. On race week, you want every food you eat to be one you tested on a long training run.

A second common mistake is neglecting hydration. As you add carbohydrates, your muscles store extra water with glycogen. That is normal and desirable, but you need to drink enough fluid to support it. Sipping water throughout the day and including electrolyte sources keeps everything balanced.

1. Cut high-fiber foods 2-3 days before: Beans, legumes, whole grain bread, raw vegetables, and seeds can cause gas and bloating. Switch to refined grains and well-cooked produce.
2. Avoid high-fat meals the day before: Fried foods, heavy sauces, and fatty cuts of meat delay gastric emptying. Stick to lean protein and simple carbohydrates.
3. Skip alcohol entirely the night before: Alcohol disrupts sleep quality, dehydrates, and interferes with glycogen storage. Not worth the risk.
4. Stay away from dairy if it bothers you: For some runners, milk and yogurt cause stomach upset before a race. Test your tolerance during training; if in doubt, skip it.

Race week is not the time for bravery. If a food gave you trouble during a 10-mile training run, it will almost certainly cause trouble during your half marathon. Stick to what works for you.

Race Morning and Final Fueling Strategy

Race morning presents one more fueling decision. You want something that provides energy without sitting heavy. Many runners find oatmeal with a drizzle of honey, a banana, or a plain bagel works well. If solid food is difficult first thing, a smoothie with Greek yogurt and fruit is a good pre-race option.

Geisinger recommends excellent meal choices for pre-race breakfasts, including combinations like a banana with nut butter or a smoothie with Greek yogurt and fruit. The principle is the same: familiar, low-fiber, moderate in size. You ideally want to finish eating 2 to 3 hours before the start to allow digestion.

Some runners also use a small snack right before the start — a Honey Stinger Waffle, energy gel, or graham crackers work well for quick carbohydrate top-off. If your stomach can handle it, this final boost can help you feel strong through the first few miles. Test these during your training runs, not on race day.

The Bottom Line

The week of your half marathon is about steady, familiar fueling: increase healthy carbohydrates 2 to 3 days before the race, shift to low-fiber options the day before, and eat a simple, tested breakfast on race morning. Avoid new foods, high-fat meals, alcohol, and high-fiber items in the final days. Your glycogen stores will be full and your stomach will be calm — two of the biggest variables you can control.

A registered dietitian who works with endurance athletes can help you fine-tune carb targets and meal timing based on your body weight, training volume, and race-day experience — especially if you have struggled with stomach issues or energy swings during long runs.