Bushcraft food: why foraging never balances the calorie ledger

Quick answer: Carry almost all of your calories in with you, because an active day of bushcraft burns roughly 3,000 to 4,500 calories and a morning of foraging in Britain rarely returns more than a few hundred. Plan on about 700g to 1kg of dense, dry food per person per day, and keep a sealed, ready-to-eat reserve for when the day goes wrong.

Written by James Frost, founder of Flaming Phoenix and the maker of Phoenix Bars. Customers have carried my bars on expeditions to Everest, and this page covers the food side of bushcraft rather than the skills. Updated November 2026.

The hardest part of feeding yourself in the wild is that finding food usually costs you more calories than the food gives back. A day of real bushcraft, building shelter, processing firewood, hauling water, moving over rough ground, can burn 3,000 to 4,500 calories or more. A morning of foraging might return a few hundred, and most of what grows around you in Britain is closer to a salad than a meal. So my answer to "what do you eat doing bushcraft" is this: plan around a calorie deficit, eat the densest food you can carry, and keep a sealed reserve you never touch unless the day goes wrong. The rest of this page is the accounting behind that sentence.

I find it useful to treat wilderness feeding as a ledger with two columns. On one side, the energy the day takes out of you. On the other, the energy you can actually put back. Bushcraft, more than almost any other outdoor pursuit, is the discipline of keeping that ledger from running too far into the red. Most guides only ever talk about the credit column, the wild food, and ignore what it costs to earn it. That is the error that leaves people cold and slow by day three.

The debit column: what a day actually costs

Start with what you spend, because it is larger and more predictable than what you can find. Even before you do anything, your body spends its basal rate just keeping you alive. Add the work of bushcraft on top and the number climbs fast. A person carrying a moderate load over uneven ground burns several hundred calories an hour on the move alone, and shelter building, baton work, and digging are closer to manual labour than to a stroll. Across a full day, 3,000 to 4,500 calories is a realistic active figure, and a hard cold day can push higher.

Cold is the line item people forget. A small study led by Cara Ocobock followed 53 people on National Outdoor Leadership School (NOLS) courses in Wyoming and found that those hiking in roughly minus nine to minus five degrees Celsius burned about 34% more calories than those hiking in mild spring weather: around 4,800 calories a day for the men and 3,900 for the women in winter. Your body also spends extra energy on heat the moment you stop moving and start to shiver. So winter bushcraft does something cruel: it raises the debit column at the exact moment it empties the credit one. This is the same physiology that makes cold weather so punishing at altitude, which I cover on the high altitude nutrition guide. It is also why calorie density, not volume, is the number to plan around; our table of the lightest high calorie food for backpacking ranks the usual options. There is more on that principle on the calorie-dense foods guide.

The credit column: what the land actually pays out

Now the side everyone oversells. The most important and least taught skill in survival foraging is net energy gain: not "is this edible," but "does eating this leave me better off than the effort of getting it." The UK bushcraft instructor Paul Kirtley frames it as weighing how much energy you spend against how much you get back, and a handful of berries will not repay the calories you spent walking a mile to reach them. Some classic "wild foods" barely pay their way. Dandelion roots are small and fiddly to dig, and even a good burdock root takes real effort to excavate. There is a legal catch too: under the Wildlife and Countryside Act 1981 it is an offence to uproot any wild plant without the landowner's permission, and fishing or taking game also needs permission (plus a rod licence for freshwater fishing in England and Wales). Nettles, greens, and most leafy forage are vitamins and water dressed up as a meal, not fuel.

The food that does pay is narrow and seasonal: fatty nuts, starchy roots and tubers, oily fish, game, and carbohydrate-rich seeds. These exist, but they arrive in feast-and-famine windows. An autumn nut mast or a fish run can briefly put you in surplus. The long stretches between them, and almost the whole of a British winter, leave you with low-calorie scraps while your needs are at their peak. This is why "I will just live off the land" is the line that gets beginners into trouble. You can drink the landscape and graze it, but you very rarely bank a calorie profit from it. For the gentler reality of fuelling ordinary multi-day walking, where resupply exists and the stakes are lower, see the long-distance walking nutrition guide and the broader hiking and trekking nutrition guide.

How does forage compare with the food you carry?

Calories per 100g decide how much you have to carry or gather for a day's work. These are typical UK values, rounded, so treat them as approximate and check the labels on what you pack.

You would need to pick and eat about 2.4kg of cooked nettle tops to match the calories in 150g of shelled hazelnuts, which is why nettles count as a vegetable rather than a meal. Olive oil is the bushcrafter's quiet trick: a small bottle adds hundreds of calories to anything you cook for very little weight.

The line item that balances the book

Here is the part of the ledger that armies worked out a century ago. In 1907 the US Army introduced its "iron ration": three small cakes, three one-ounce chocolate bars, and salt and pepper, sealed in a tin that weighed a pound and was carried in a uniform pocket. It had one rule. You did not open it for hunger, convenience, or a dull menu. You opened it only when normal food was gone and you were on your own. The sealed packet was a calorie reserve, deliberately set outside the daily ledger so it was always there when the day fell apart.

That idea outlived the tin. Modern hikers and bushcrafters carry the same concept in a different wrapper: a small, shelf-stable block of calories kept in reserve. I make Phoenix Bars, so I am biased, but they do exactly that job. Each one carries up to 557 calories in a compact, 120g bar made with gluten-free oats, around 4.4 to 4.6 calories per gram, which is about ten times the density of nettles or other leafy forage. They keep for up to two years (Cherry Bakewell up to 12 months), they are vegan and gluten-free, and they need no fire. You can eat one as it is, broken up in your hand on the move, or tip one into a mug and mix with water for a high calorie porridge. There is a short guide to both methods on how to use Phoenix Bars.

Foraging and fieldcraft are the point of bushcraft, and you should keep practising all of them. The reserve is the line item that stops a bad day becoming a dangerous one, giving you calories to think and walk on when the credit column has failed and you still have to get out. Rotating all six Phoenix Bar flavours (Apple and Cinnamon, Cherry Bakewell, Chocolate, Vanilla, Salted Caramel and Ginger) keeps the reserve varied when you are tired and cold.

How I would actually pack the ledger

For a single overnight, carry your planned food as dense items and tuck one or two high calorie bars away as your untouchable reserve. The 12-bar Starter bundle covers a couple of short trips with reserve to spare. For a two to four day course or wild camp, where the gap between need and forage widens, I would build the daily ration around dense, no-cook food of the kind in our best camping snacks guide and keep three to four bars sealed back, which is roughly what the 18-bar Essential bundle is sized for. For longer self-reliant trips, expedition prep, or group use, the 36-bar Complete bundle gives you a proper reserve and lets you rotate flavours. You can see the full range on the bundles page. The same reserve logic applies to other skills-led, low-resupply pursuits like caving, where a sealed pocket of calories is carried for the same reason it was in 1907.

Bushcraft food questions

Can you really not live off foraging in Britain? For short periods, with luck and the right season, you can take the edge off. As a calorie strategy across a multi-day trip, especially outside autumn, no. The plants that are easy to find are low in calories, and the ones worth real energy are seasonal, scattered, or costly to process. Treat forage as a supplement and morale, not as your fuel.

How many calories does a day of bushcraft burn? For an active adult, plan on 3,000 to 4,500 calories, and add roughly a third again in sub-zero conditions once you account for shivering and heat loss. The exact figure depends on your size, your load, the terrain, and the temperature, but underfuelling by a thousand calories a day shows up fast as fatigue and poor judgement.

What food should I take on a bushcraft trip? Dense, dry food that survives a rucksack and needs little or no cooking: porridge oats, nuts and nut butter, hard cheese, salami or other cured meat, chocolate, dried fruit, couscous or noodles, and a small bottle of olive oil to add calories to whatever you cook. Fresh food is fine for the first evening, but it is heavy for the calories it carries. Then add one or two sealed, ready-to-eat items as a reserve.

How much food should I carry per day? Roughly 700g to 1kg of dry, dense food per person per day, which covers 3,000 to 4,500 calories at around 4.5 calories per gram. Go to the top of that range in winter, when the same work can cost about a third more, and count anything you forage as a bonus rather than part of the plan.

What is the best emergency food to carry? Something sealed and dense that you can eat with no fire or water, such as a high-calorie bar, a block of chocolate or a bag of nuts. Armies settled on a sealed, calorie-dense reserve over a century ago and the logic has not changed: it should fit in a jacket pocket and stay there until you need it.

Does reserve food need cooking? It shouldn't. The point of a reserve is that you can eat it cold and tired, with no fire. Food that only works with a stove belongs in the daily ration, not the reserve.

How long will reserve food keep in a pack? Check the best-before date on everything you carry, and replace anything close to it at the start of each season. Keeping it sealed in its wrapper inside a dry bag protects it from damp and crushing.

I would rather you finished this page slightly less romantic about foraging and slightly more honest about the maths, because that honesty is what keeps people safe in the field. Learn the skills properly, respect the credit column for what it actually pays, and never walk in without the one line item that balances the book. If you want the deeper background on packing density for harder trips, the calorie-dense foods guide goes further, and the simplest first step is to keep a couple of bars from the Starter bundle sealed in your pack before the next one.

Sources: STAT, Does exercise burn more calories in the cold than in warm weather? (Sharon Begley, December 2017), reporting Cara Ocobock's NOLS study; Paul Kirtley, bushcraft instructor, on the net energy gain of foraging; Wildlife and Countryside Act 1981, section 13; McCance and Widdowson's CoFID 2021.