50-Mile Ultra Nutrition Plan: How to Fuel Your First Long Ultra

At mile 30, “I'll eat whatever looks good” becomes a surprisingly complicated nutrition plan.

Maybe the potatoes look great. Maybe everything tastes sweet, the next station is farther away than you remembered, and your pocket contains one gel and a crushed cracker. A 50-mile ultra nutrition plan needs to tell you what to eat now and what to carry out of the aid station.

My boring answer is counted carbs first, familiar food for variety, and a reserve that can cover a delay. Gels make the counting easy, but you can build a plan without them too.

Below is a worked ten-hour menu, followed by the packing decisions that make it usable. If you're racing the shorter distance, the 50K fueling guide covers that version. Here, the extra hours make resupply and food preferences a bigger part of the job.

Pick a target you can repeat

How much should you actually eat?

The ISSN ultramarathon position stand discusses roughly 150-300 calories per hour for races up to 50 miles. Its broader ultra guidance includes 30-50g/hr of carbohydrate and 5-10g/hr of protein. These recommendations draw on varied distances and limited research, including observational studies. They aren't a trial-tested menu for every first-time 50-miler.

Broader endurance carbohydrate guidance describes intakes up to about 90g/hr for longer efforts using mixed carbohydrates, such as glucose and fructose. It also discusses adjusting downward at lower absolute exercise intensities. A slow trail day and a hard lab ride don't automatically deserve the same target.

So I'd start with what your longer training sessions have actually shown. If 40g/hr is repeatable and 60g/hr is still an experiment, race morning is a poor place to declare the experiment finished. Work toward an appropriate target before race week, with a sports dietitian if you need help.

During-exercise guidance uses absolute grams per hour rather than simply multiplying body weight. A smaller runner, including a woman, shouldn't automatically halve the carb target. But that doesn't mean everyone will tolerate the same food, amount, or effort.

The example below uses 60g/hr for a runner who has already practiced it. That's 240 calories per hour from carbohydrate, using four calories per gram; any fat or protein in the food adds to total energy. The carb number is the one we're counting here.

A ten-hour menu with the arithmetic showing

All quantities in this example are hypothetical label or recipe values. They're assumptions for the calculation, not verified portions for every gel, rice ball, or drink. Replace them with your own labels and measured recipes.

Suppose your gel supplies 30g of carbs, your rice ball 30g, your measured pretzel portion 30g, and your applesauce pouch 15g. A “drink serving” below means a measured quantity supplying 30g, prepared according to its directions. It isn't a standard bottle size or a fluid recommendation.

Race hour	Food consumed this hour (gram amounts are carbs, not food weight)	Carbs
0:00-1:00	Two 30g gels	60g
1:00-2:00	Two 30g gels	60g
2:00-3:00	Two 30g gels	60g
3:00-4:00	One 30g gel and one 30g rice ball	60g
4:00-5:00	Two measured drink servings supplying 30g each	60g
5:00-6:00	One 30g rice ball and one 30g pretzel portion	60g
6:00-7:00	One 30g gel and two 15g applesauce pouches	60g
7:00-8:00	One 30g gel and one 30g drink serving	60g
8:00-9:00	One 30g rice ball and one 30g gel	60g
9:00-10:00	Two 30g gels	60g
Ten-hour total	All food and drink above	600g

Across the day, that's twelve gels (360g), three rice balls (90g), three drink servings (90g), one pretzel portion (30g), and two applesauce pouches (30g). Total: 600g, averaging 60g/hr.

Breakfast and any pre-start snack sit outside that total. So does food still in your vest at the finish. Carrying it doesn't count as eating it.

For the gel-only hours, one packet at 15 minutes and another at 45 minutes supplies the stated amount. Repeat that pattern in each applicable hour. Food hours can use the same two eating windows, adjusted around comfortable hiking sections and your practiced routine. You don't need to swallow a rice ball while bombing a descent.

And don't drink extra just to complete the drink row. If its required volume doesn't suit your separate fluid plan, replace some of those carbs with a tested food or gel. This is a menu you can change, not a dare.

Need a starting plan to rehearse? Build your carb, fluid, and sodium timeline in about 60 seconds: Use the free EnduranceOS planner.

You can fuel without gels, but count the swaps

I prefer gels as the default because the wrapper does some of the bookkeeping. GU, Maurten, and SiS aren't interchangeable portions, though. Read the actual product and flavor label.

Hate gels? You can replace a 30g packet in this example with the measured 30g rice ball, two 15g pouches, or another tested combination totaling 30g. Replacing it with “some banana” leaves the calculation unfinished.

Two rice balls would cover one 60g hour under these assumptions. So would one rice ball and two applesauce pouches. That's a gel-free option without making fluid intake carry the whole carb target.

But equal carbs don't make foods identical to eat. Test the texture, package, portion, and how they feel while moving. Pack homemade food safely for the expected time and temperature; something comfortable from your fridge still needs a workable race-day storage plan.

The ISSN review notes that savory foods can become more appealing as ultras get longer. That's a useful reason to pack variety, not a reason to turn every stop into lunch. Broth may be welcome, but don't count it toward carbs unless you know what it supplies.

At an aid station, ask what the drink is and how it's mixed. Check the current race guide beforehand, then use the information you actually have. A volunteer's handful of pretzels won't necessarily match your measured training portion.

You don't need to win lunch. You need food you can count and still want to eat.

Pack for time to the next reliable refill

Mile markers are a poor food clock on a hilly trail.

Start with the current course map, expected section times, aid-station offerings, and drop-bag rules. A five-mile section might take much longer late in the race than it did early. Use a conservative time estimate and decide what delay reserve makes sense for that course.

For example, at 60g/hr, a section expected to take 2.5 hours needs 150g of planned carbs. Add a separately chosen half-hour reserve of 30g, and you leave carrying 180g. With our hypothetical 30g gels, that's five planned packets plus one spare.

That reserve is an illustration, not a rule for every race. A remote section, uncertain weather, or limited support could justify more. Don't eat the extra packet automatically just because it's there.

Can you rely only on aid-station food? Perhaps, if the offerings, spacing, and your tolerance support it. I would still carry a familiar backup. “There will be food” tells you much less than “I can collect enough tested fuel to reach the next station.”

Use a drop bag to make that exchange easy. Label a section's fuel together, write the quantity to collect, and include one familiar alternative if sweetness has become unbearable. Keep any drink powder marked with its intended mixing volume. Your mile-30 brain shouldn't have to solve a mystery bag of white powder.

And plan what happens if the bag isn't accessible. Could the station's tested products cover the next section? Does your carried reserve reach another reliable stop? If neither answer works, the resupply plan needs more work before the start.

Keep a short record as you go: consumed, carried, next refill. That helps prevent counting a gel twice because it moved from your drop bag to your pocket. One long climb can create enough denial and error without your inventory helping.

Keep fluids, sodium, and caffeine in their own columns

Carb math cannot tell you how much to drink.

NATA's fluid-replacement guidance supports individualized plans informed by sweat rate, conditions, body size, effort, and tolerance. Avoid weight gain from overdrinking. When you don't know your sweat rate, drinking to thirst is a safer fallback than forcing an hourly volume.

Count water, sports drink, and other fluids together. Then count sodium from the quantities you actually consume before adding capsules. A drink labeled 600mg sodium per liter supplies 300mg in 500ml. That's label math, not your prescribed sodium target.

Sodium-containing sports drink doesn't make excessive fluid intake safe. The hyponatremia guide explains the overdrinking risk.

Caffeine gets another column. Coffee, caffeinated gels, gum, and cola all contribute to the same total. If you use caffeine, rehearse the dose and timing, and label caffeinated packets clearly so a fuel substitution doesn't accidentally become an extra dose. The caffeine timing guide covers that decision separately; it doesn't have to be part of every hour.

Practice the menu, including the awkward parts

A kitchen table is a forgiving place to eat a rice ball.

Use suitable training runs to test opening packages, carrying food, mixing drinks, and eating on the kind of terrain you expect. Longer sessions let you check repeated servings; shorter sessions can test an individual product or the pocket that keeps bouncing.

Keep breakfast in the rehearsal too. The pre-race breakfast guide handles that meal, while the gut-training guide explains how to build practice without treating every easy run as a feeding experiment.

Write down what you consumed, when, the conditions, and any symptoms. If the plan changes, change one part so the next run teaches you something. A new breakfast, new drink mix, and harder pace make a fairly useless product test.

What if eating gets difficult late? Don't treat a missed serving as a debt that must be repaid at the next table. Ease off and reassess instead of cramming several feeds into one stop. A small amount of familiar food may be more manageable if symptoms settle, but ongoing or worsening symptoms need help rather than another forced packet.

NATA warns that dehydration and overhydration symptoms can overlap. Repeated vomiting, confusion, a severe or worsening headache, or trouble coordinating calls for race medical help. Don't diagnose the problem by guessing whether another gel, water, or salt capsule will fix it.

Make the plan simple enough for mile 40

Before race week, you should be able to answer four questions: what's the practiced hourly target, what actually supplies it, where is the next refill, and what happens if that refill disappoints you?

The ten-hour example answers the first two with 600g of counted carbs. Your course map answers the rest. A thirteen-hour finish at the same hypothetical 60g/hr would require 780g, another 180g of planned fuel; the finish-time estimate changes the supply you need even when the hourly number stays put.

Going much longer? The 100-mile nutrition plan adds overnight food, crew, and drop-bag considerations.

Before you leave the table at mile 30, count what's going back into the vest and check the time to your next refill. The potatoes can be a pleasant surprise; enough fuel for the next section shouldn't be.

The EnduranceOS planner builds an hourly carb, fluid, and sodium plan from your race details in about 60 seconds. It's free. Take the plan into training, count what you actually consume, and adjust from there.

This article is educational, not individual medical advice. Medical conditions affecting nutrition or fluid balance, recurring symptoms, or uncertainty about an appropriate target call for guidance from a qualified clinician or sports dietitian.