Marathon Nutrition Checklist: Everything to Plan, Pack, and Eat From 2 Weeks Out to the Finish Line

In Summary

Your marathon nutrition plan starts 14 days before the race, not the morning of.
Test every product you'll use on race day during training — never debut anything new.
Carb loading is a 36–48 hour strategy, not a pasta-binge the night before.
Sweatr builds your personalised fueling and hydration plan from your wearable data.

You've done the long runs. You've hit the mileage. Your taper is starting. But if you haven't nailed your nutrition plan by now, everything else is at risk.

Most marathon blowups after mile 18 aren't fitness problems. They're fueling problems. The runner had the legs but not the glycogen. They drank too much, too little, or the wrong thing. They tried a new gel on race morning because someone in the corral said it was great.

This checklist is designed to stop that from happening. It covers every nutritional decision from 14 days out to the moment you cross the finish line — structured as a timeline so you know exactly what to do and when.

14 to 10 Days Out: Lock In Your Plan

This is your last window to make strategic decisions. After this, you're executing, not experimenting.

Finalise your in-race fueling products. By now you should have tested your gels, drink mix, and electrolytes on at least three long runs. If you haven't, use your next long run this week as your final dress rehearsal. Write down exactly what you'll carry and consume.

Calculate your hourly carbohydrate target. For most marathon runners, aim for 60–90g of carbohydrates per hour. Your exact number depends on your body weight, finishing time, and gut tolerance. A 70kg runner targeting a 4-hour marathon needs a different plan than a 55kg runner targeting 3:15. Sweatr calculates this automatically from your Apple Watch or Garmin data — factoring in your training load, sweat rate, and race-day conditions.

Decide your fluid strategy. The general guideline is 400–800ml per hour, but your actual needs depend on your sweat rate, the weather forecast, and the course aid station layout. If you've done a sweat rate test, use that data. If you haven't, Sweatr can estimate it from your recent training sessions.

Check the race aid station plan. Most marathons publish what they'll offer at each station — water, sports drink (which brand?), gels, bananas. Know what's available so you can plan whether to carry your own or use what's on course. If the race uses a drink mix you haven't tested, carry your own.

Map your fueling to the course. Mark the kilometres or miles where you'll take each gel, each drink, and each electrolyte. Account for hills — it's harder to eat while climbing, so plan your gels for flat or downhill sections.

9 to 4 Days Out: Dial In Daily Nutrition

The work is done. Your taper is underway. Now your job is to eat well, sleep well, and not overthink it.

Maintain your normal calorie intake. One of the most common taper mistakes is cutting calories because training volume drops. Your body needs those calories to repair tissue and top off glycogen stores. Eat the same amount you did during peak training, or slightly more.

Start increasing carbohydrate proportion. You don't need to carb-load yet, but begin shifting your plate toward more carbs and slightly less fat. Think rice, pasta, bread, potatoes, oats. Aim for 7–8g of carbohydrate per kilogram of body weight per day.

Stay consistently hydrated. Don't try to "pre-load" with excessive water. Just drink steadily throughout the day — about 2–3 litres total. Include electrolytes if you tend to run salty. Your urine should be pale straw, not clear (clear usually means you're overdrinking).

Avoid new foods. This is not the week to try the trendy new restaurant or experiment with a high-fibre recipe. Stick to foods your stomach knows and trusts.

Do a gear check. Lay out everything you'll carry on race day: gels, electrolyte tabs, race belt or vest, water bottle (if carrying one). Make sure nothing is expired.

3 Days Out: Carb Loading Window Opens

Carb loading is one of the most misunderstood nutrition strategies in distance running. It's not one big pasta dinner. It's a 36–48 hour window of consistently elevated carbohydrate intake.

Target 10–12g of carbohydrates per kilogram of body weight per day for the 48 hours before race morning. For a 70kg runner, that's 700–840g of carbohydrates per day. That sounds like a lot — and it is. It means choosing carb-dense, low-fibre foods at every meal.

Practical carb loading meals:

Breakfast: large bowl of white rice with honey and banana, plus toast with jam
Lunch: white pasta with a simple tomato sauce, bread roll, fruit juice
Dinner: baked potato with lean protein, white bread, sports drink
Snacks: pretzels, rice cakes, energy bars, dried fruit

Keep fibre low. The last thing you want is GI distress on race morning. Swap brown rice for white, wholemeal bread for white, and skip the salad for a couple of days.

Reduce fat intake slightly. Fat slows digestion. You want your carbs absorbed and stored as glycogen as efficiently as possible.

Keep protein moderate. You still need it for muscle repair, but it doesn't need to dominate your plate this week. 1.2–1.5g per kg is plenty.

The Night Before: Keep It Boring

Eat dinner early — by 6pm if your race starts at 7–8am. This gives your body 12+ hours to digest. A late dinner increases the risk of GI issues on race morning.

Choose a meal you've eaten before. White pasta with a simple sauce is the classic for a reason. Add some lean protein (chicken, fish) and keep the portion moderate — large but not stuffed.

Avoid alcohol, excessive dairy, spicy food, and high-fat sauces. All of these can trigger stomach issues the next morning.

Prepare your race morning breakfast. Lay out exactly what you'll eat and when. Set an alarm early enough to eat 3–4 hours before the gun.

Sip water throughout the evening but stop about an hour before bed to avoid waking up for bathroom trips.

Race Morning: The 4-Hour Countdown

What you eat in the hours before the start directly affects how you feel at mile 6 — and whether your gut cooperates at mile 18.

3.5–4 hours before the start: Eat your pre-race meal. Aim for 1–2g of carbohydrate per kilogram of body weight. Good options: toast with honey and banana, porridge with maple syrup, a plain bagel with peanut butter, or white rice with a little protein. Keep fat and fibre low.

2 hours before: Sip 400–500ml of water or a light electrolyte drink. Stop eating solid food.

1 hour before: Small top-up if needed — a few swigs of sports drink or half an energy bar. Nothing heavy.

30 minutes before: Final sip of water. Visit the bathroom. Stop drinking — you'll start again at the first aid station.

In the corral: Have one gel accessible if you want a small carb boost 10–15 minutes before the gun. Many runners find this helps, but it's optional and only worth doing if you've tested it in training.

During the Race: Execute the Plan

This is where your preparation pays off. The golden rule: stick to what you tested in training.

First 30 minutes: Don't fuel yet. Your glycogen stores are full from carb loading. Focus on settling into your pace and staying calm. Take a few sips of water if it's warm.

From 30–45 minutes onward: Begin your fueling schedule. Take your first gel with water. From here, aim for your target carbohydrate intake every 20–30 minutes.

A sample fueling timeline for a 4-hour marathon (60g carbs/hour):

0:35 — Gel 1 (25g carbs) + 150ml water
1:05 — Gel 2 (25g carbs) + 150ml water
1:05–1:30 — Sip electrolyte drink (10g carbs)
1:35 — Gel 3 + water
2:05 — Gel 4 + water
2:35 — Gel 5 + water
3:05 — Gel 6 + water (last gel — after this, it's the finish line push)

Hydration during the race: Drink at planned intervals, not at every aid station just because it's there. Aim for 150–250ml every 15–20 minutes, adjusted for temperature. In hot conditions, increase fluid and add sodium. In cool conditions, you can reduce slightly.

If something goes wrong: Stomach cramping, nausea, or bloating mid-race usually means you took in too much too fast, or you're dehydrated and your gut has shut down. Slow your pace slightly, switch to sipping water only for 10–15 minutes, and let your stomach settle before resuming gels.

Watch for these warning signs:

Heart rate climbing faster than pace justifies → possible dehydration
Sudden muscle cramping → electrolyte deficit or fatigue
Mental fog or mood crash → glycogen depletion (bonking)
Sloshing stomach → overdrinking, slow down fluid intake

After the Finish: The Recovery Window

Crossing the line doesn't mean nutrition stops mattering.

Within 30 minutes: Eat or drink something with both carbohydrates and protein. A recovery shake, chocolate milk, or a banana with a handful of nuts all work. Aim for 1–1.2g of carbs per kilogram of body weight and 20–30g of protein.

First 2 hours: Continue sipping fluids with electrolytes. Your body is still dehydrated even if you don't feel thirsty. Weigh yourself if possible — every kilogram lost during the race represents roughly 1 litre of fluid deficit.

First 24 hours: Eat regular, balanced meals. Your glycogen stores take 24–48 hours to fully replenish. Don't restrict calories. Your body earned this fuel.

The Printable Checklist

14–10 days out:

[ ] Finalise gel, drink mix, and electrolyte choices
[ ] Calculate hourly carb target (60–90g/hr)
[ ] Calculate hourly fluid target (400–800ml/hr)
[ ] Review race aid station plan and course map
[ ] Map fueling points to course kilometres/miles
[ ] Complete final long run dress rehearsal

9–4 days out:

[ ] Maintain normal calorie intake through taper
[ ] Shift plate toward higher carbohydrate proportion
[ ] Hydrate consistently (2–3L/day, pale urine)
[ ] Avoid unfamiliar foods
[ ] Lay out all race day nutrition and gear

3 days out — carb loading:

[ ] Increase to 10–12g carbs/kg/day for 48 hours
[ ] Switch to low-fibre carb sources
[ ] Reduce fat, moderate protein
[ ] Prepare race morning meal ingredients

Night before:

[ ] Eat dinner by 6pm — familiar, carb-heavy, low-fibre
[ ] No alcohol, spicy food, or excessive dairy
[ ] Prepare race morning food and set alarm
[ ] Sip water, stop 1 hour before bed

Race morning:

[ ] Eat pre-race meal 3.5–4 hours before start
[ ] Sip 400–500ml water/electrolyte drink by 2 hours before
[ ] Final sip at 30 minutes, then stop
[ ] Gels and fuel accessible in race belt/pockets

During race:

[ ] Start fueling at 30–45 minutes
[ ] Hit carb target every 20–30 minutes
[ ] Drink to plan, not to every aid station
[ ] Monitor warning signs: HR drift, cramping, mental fog

After the finish:

[ ] Recovery nutrition within 30 minutes
[ ] Continue electrolyte fluids for 2+ hours
[ ] Eat balanced meals for 24 hours — don't restrict

Your Plan, Personalised

Every number in this checklist — carb targets, fluid volumes, sodium needs — depends on your body, your pace, and race-day conditions. A 55kg runner in cool weather needs a fundamentally different plan from an 80kg runner in 28-degree heat.

Sweatr builds your personalised marathon nutrition plan from your Apple Watch or Garmin data. It calculates your carb ceiling, estimates your sweat rate from recent training, and maps your fueling schedule to your target finishing time — so you're not working from generic ranges.

Your training data already holds the answers. Sweatr just turns them into a plan you can follow.