Long-distance walking nutrition: how to fuel multi-day trails without hitting the wall

Quick answer: walking 15 to 25 miles a day with a pack burns roughly 3,000 to 5,000 calories, so on a multi-day walk you need to eat well above a normal 2,000 to 2,500. The simplest way is a big breakfast and dinner plus about 200 calories of snacks for every hour you walk.

Written by James Frost, founder of Flaming Phoenix and the maker of Phoenix Bars. For broader guidance on day hikes and weekend walking, see the Hiking & Trekking Nutrition page. Updated November 2026.

Most people who attempt a long-distance walk, whether that is the South West Coast Path, Hadrian's Wall, the West Highland Way, or the Camino de Santiago, think about boots, waterproofs, and accommodation long before they think about food. Nutrition gets treated as an afterthought: grab a few cereal bars, hope there is a pub at lunch, worry about it later.

Then day three arrives. Legs feel heavier than they should. The morning enthusiasm has disappeared. Every incline feels steeper than it looked on the map. The afternoon becomes a slog, and the thought of doing it all again tomorrow feels daunting.

This is rarely a fitness problem. It is almost always a calorie problem. The food was not calorie-dense enough, there was not enough of it, or it was not eaten consistently enough across the day. This guide explains how to get your nutrition right so that day seven feels as strong as day one.

How many calories does long-distance walking burn?

The numbers are higher than most people expect. Walking 15 to 25 miles per day with a pack, across mixed terrain, burns somewhere between 3,000 and 5,000 calories. That is roughly double a typical day at home or in an office.

The exact figure depends on body weight, pack weight, terrain, gradient, and weather conditions. Wind, rain, and cold all increase energy expenditure because your body works harder to regulate temperature. A 75kg person walking 20 miles on undulating terrain with an 8kg pack will burn approximately 4,000 calories across the day.

Compare that to the standard recommended daily intake of around 2,000 to 2,500 calories. On a multi-day walk, you need to eat significantly more than normal just to break even. Fall short, and your body starts drawing down its glycogen and fat stores. You will usually feel it within 48 hours.

What most walkers miss is that a calorie deficit is hard to make up after the fact. If you undereat on day one and two, day three will punish you regardless of what you eat for breakfast that morning. Consistent, adequate fuelling from the very first mile is what separates people who finish strong from people who limp to the end.

Why standard trail snacks fall short on multi-day walks

A day walk and a multi-day walk have completely different nutritional demands. On a single day out, you can get away with a few flapjacks and a sandwich because you will eat a proper meal that evening and recover overnight. Over five, ten, or thirty consecutive days, the accumulated calorie deficit from inadequate trail food compounds into real physical decline.

The typical long-distance walker's food bag contains cereal bars, crisps, chocolate, dried fruit, and maybe a few packets of nuts. These are all fine foods individually, but most cereal bars contain 150 to 250 calories. To get 4,000 calories from food like that you would need 16 to 27 bars a day, and even the 1,500 or so you need between meals takes 6 to 10 of them. Nobody wants to do that, and nobody does, so the daily deficit grows with every mile.

The other problem is volume. Carrying five days of food between resupply points is a significant weight penalty. A kilogram of typical trail snacks provides around 4,000 to 5,000 calories. If you are self-sufficient and need 4,000 calories a day from what you carry, that is nearly a kilogram of food per day, or 4 to 5kg for a five-day stretch. This is where calorie density per gram becomes a practical, weight-saving decision. Our ranking of the lightest high calorie backpacking food shows which trail foods carry the most calories per gram.

What to look for in long-distance walking food

The ideal food for multi-day walking shares a few characteristics that become more important the longer the walk lasts.

High calorie density. More calories per gram means less weight in the pack, especially between resupply points. Nuts deliver around 5.5 to 6 calories per gram, nut butters around 6, and most energy bars for hiking around 3.5 to 4.5, with the densest high calorie bars at the top of that range.

Palatability over many days. Flavour fatigue is one of the most underappreciated problems in long-distance walking. Foods that taste great on day one can become unpleasant by day five. Overly sweet bars, gels, and sweets are the worst offenders. Carry variety, and go easy on sweetness.

Easy to eat while moving. Stopping for a full lunch every day is a luxury that weather, daylight, and schedule do not always allow. Food that can be eaten on the move, in rain, without utensils, and without much chewing effort keeps your pace consistent. Anything you can break into bite-sized pieces and eat across a morning or afternoon earns its place.

Versatility. Food that can become a meal stretches further. Instant oats, couscous and noodles only need water, and some bars can be mixed into porridge, which helps on long walks where you want a proper meal but do not want to carry heavy dehydrated meals for every evening.

Shelf stability. Long-distance walks require planning weeks or months ahead. Food that goes off, melts in heat, or freezes in cold weather creates problems, so check best-before dates and try your snacks in the conditions you expect.

Dietary inclusivity. Group walks, charity challenges, and guided treks bring together people with different dietary needs. Check labels for allergens, and include a few foods that suit everyone, such as vegan and gluten-free options.

A practical fuelling strategy for multi-day walks

Rather than prescribing exact meals, here is a framework that works across most long-distance walking scenarios.

Before you start walking each day, eat a substantial breakfast containing complex carbohydrates, some protein, and some fat. Porridge, eggs, toast, or a combination. If you are wild camping or do not have cooking facilities, instant oats soaked in water with a handful of nuts and dried fruit makes a calorie-dense breakfast in a couple of minutes.

During the first two hours, eat a small snack every 45 to 60 minutes. The goal is to top up energy before you feel hungry. Once you feel hungry, you are already behind. Aim for around 200 calories an hour, and eat more on steep or cold days.

Through the middle of the day, alternate between savoury and sweet snacks. Cheese, salted nuts, or crackers followed by dried fruit, chocolate, or another portion of bar. This rotation prevents flavour fatigue and keeps your appetite engaged.

In the final hours, do not taper your eating. Many walkers reduce food intake as they approach their destination because they know dinner is coming. This is a mistake. The last two hours are when your glycogen is most depleted, and underfuelling here means poor recovery overnight, which shows up as heavy legs the next morning. Keep eating right up until you stop.

After you finish for the day, eat a meal containing carbohydrates and protein within an hour or so of stopping. Glycogen refills fastest in the first few hours after exercise, which matters when you walk again tomorrow.

How many calories should you eat at lunch?

On a normal day, lunch is usually a quarter to a third of what you eat, roughly 500 to 800 calories on a 2,000 to 2,500 calorie day. On a long walking day you need more, so aim for around 800 to 1,000 calories at lunch and spread the rest of the day's food around it rather than saving it for dinner.

Here is how a 4,000-calorie walking day might split, using typical UK portions. The figures are approximate.

Lunch is only about a fifth of the day here. The snacks either side of it, about 200 calories an hour, add up to more than lunch does, which is why eating steadily on the move matters more than one big stop.

Hydration on long-distance walks

Dehydration compounds the effects of calorie deficit and is just as likely to ruin your walk. A practical target is 250ml of water per hour in mild conditions, increasing to 500ml per hour in hot weather or on steep terrain.

Small, regular sips are more effective than large drinks at rest stops. Electrolytes become important after four or five hours of continuous walking, especially in warm weather. Adding an electrolyte tablet to one of your water bottles is an easy habit to build.

Watch the colour of your urine. Pale straw is ideal. Dark yellow means you are already dehydrated.

Common long-distance walking nutrition mistakes

Mistake one: relying on pubs and cafes. On popular trails, this can work. On quieter routes, or on days when timing is tight, you may walk eight hours with nothing available. Always carry enough calories to get through the entire day without relying on external food sources.

Mistake two: packing food you do not enjoy. This sounds obvious, but many walkers pack "practical" food they do not actually like eating, and then do not eat enough of it. If you do not enjoy your trail food, you will not eat enough of it. Carry food you look forward to.

Mistake three: eating too much in the evening, too little during the day. Your body needs fuel while you are moving, not just when you stop. A huge pub dinner does not compensate for six hours of underfuelling on the trail.

Mistake four: ignoring the weight-to-calorie ratio. Between resupply points, every gram matters. Carrying two kilograms of food that provides 6,000 calories is significantly better than carrying two kilograms that provides 4,000 calories. That difference compounds over five or six days.

How many Phoenix Bars to pack for a long-distance walk

I make Phoenix Bars, so take this as the maker's view. Each bar gives you up to 557 calories in a compact, 120g bar, about 4.6 calories per gram, made with gluten-free oats. They are not sickly sweet and come in six flavours, so they rotate well across a long walk, and they mix with water or milk to make porridge (the method is in how to use Phoenix Bars). They hold their texture in freezing and hot conditions, keep for up to two years (12 months for Cherry Bakewell), and are vegan and gluten-free, which helps on group walks and charity challenges.

A practical guideline based on common UK and European long-distance walks:

For a weekend walk (two to three days), the 12-bar bundle gives you up to about 6,700 calories of trail food, which supplements cooked meals at either end of each day.

For a week-long walk (five to seven days), the 18-bar bundle gives you up to about 10,000 calories. Three bars per day, eaten in portions across the walking hours, covers the high-calorie trail snack portion of your daily intake alongside meals.

For walks of two weeks or longer, the 36-bar bundle (up to about 20,000 calories) provides a substantial portion of your trail nutrition, especially on sections where resupply is limited. For guidance on other high-calorie snack options to combine with them, see that guide.

These are supplementary to meals, not replacements. The bars cover the consistent, between-meal fuelling that most walkers get wrong.

Final thought

Long-distance walking is one of the most rewarding things you can do with your legs. Getting the nutrition right does not require complicated plans, expensive supplements, or specialist knowledge. It requires enough calories, eaten consistently, from food that is compact enough to carry and palatable enough to eat for days on end.

If you have any questions about food for a specific walk or trail, contact me directly. I am always happy to help with quantities, flavour selection, and fuelling strategies for your route.

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Sources: NHS, Understanding calories; McCance and Widdowson's CoFID 2021.