10,000 Calories a Day: The Meal Plan and the Honest Limits

Eating 10,000 calories a day is four to five times the NHS guide of 2,500 calories for an average man and 2,000 for an average woman. In food it weighs anything from 2.2 kg, if every item is dense, to 7.7 kg on a lean plate. Only polar sledge-haulers and a few strongmen need it, and even they struggle to absorb it.

Most of what you will find on 10,000 calories is challenge content: one enormous day, filmed, followed by 48 rough hours. This page takes the number seriously, because for a small group of people 10,000 calories is a normal Tuesday, and the way they get it down is the most useful eating lesson at any calorie level.

What does 10,000 calories of food look like?

10,000 calories is about 2.2 kg of dense expedition food, 3.7 kg of shop-bought pizza or around 15 litres of whole milk.

Calories per gram decides everything at this level. At the density of a lean, "clean" plate, roughly 1.3 calories per gram, 10,000 calories weighs about 7.7 kilograms of food, which is physically impossible to eat daily. At a well-chosen, calorie-dense average of 3 calories per gram, it is still 3.3 kilograms. Here is 10,000 calories of single foods, densest first, using values per 100 g from McCance and Widdowson's Composition of Foods, the UK government dataset:

• Olive oil: 1.1 kg, about 1.2 litres (899 calories per 100 g).
• Peanut butter: 1.65 kg, just over three 500 g jars (607 per 100 g).
• Milk chocolate: 1.9 kg, about nineteen 100 g bars (519 per 100 g).
• Phoenix Bars: 18 Cherry Bakewell bars, 18 × 557 = 10,026 calories in 2.16 kg.
• Shop-bought cheese and tomato pizza: 3.7 kg, about nine 400 g pizzas (272 per 100 g).
• Boiled potatoes: 13.5 kg (74 per 100 g).
• Whole milk: about 15 litres (63 per 100 g).

In body fat, 10,000 calories is about 1.3 kg. The standard estimate, set out by Kevin Hall of the US National Institutes of Health in the International Journal of Obesity, is 3,500 calories per pound of fat tissue, or roughly 7,700 per kilogram. If you meant kilojoules rather than kilograms, 10,000 calories is 41,840 kJ.

Who actually eats 10,000 calories a day?

Polar sledge-haulers burn 10,000 calories or more on their hardest days, a few strongmen eat around 10,000 to stay heavy, and almost nobody else needs it.

The best-measured case is Ranulph Fiennes and Mike Stroud's 95-day, 2,300 km crossing of Antarctica on foot, pulling their own sledges. Using doubly labelled water, Stroud's team recorded spending of up to 48.7 megajoules a day, about 11,600 calories, over days 20 to 30. Across the trip the pair ate an average of 21.3 megajoules, about 5,100 calories a day, and both lost more than a quarter of their body weight.

Polar trips are usually planned around that gap. Carrying enough food to match the burn makes the sledge heavier and the burn bigger, so skiers plan a deficit and often put on body fat before they leave. The full logic sits in the polar expedition nutrition guide and the Antarctica solo crossing calorie equation. Ocean rowers face a milder version of the same maths, covered in ocean rowing nutrition.

Strongmen eat it to stay big. Myprotein's write-up of a day cooked for Luke Stoltman, a former Europe's Strongest Man, puts it at roughly 10,000 calories across five sittings: overnight oats and eggs, two lunches of potatoes and meat, a strawberry tart, then meatballs and spaghetti. No per-meal figures are given, so treat that total as an estimate.

Everyone else arrives out of curiosity, usually via the 10,000 calorie challenge or the story that Michael Phelps ate 12,000 calories a day (he says he did not; see the questions at the end).

Is 10,000 calories a day good or too much?

For almost everyone 10,000 calories a day is too much: it is a surplus of 7,500 to 8,000 calories over the NHS guide unless you are burning it.

It is the right amount only when output matches it, as on the hardest days of a polar haul, and even then most people cannot absorb all of it. One big day will not harm most healthy adults, but it is unpleasant: the last 3,000 calories are miserable and the following 24 to 48 hours are uncomfortable. Kept up without the output, it adds body fat very quickly, and the worked numbers are further down this page.

A 10,000 calorie meal plan for an expedition day

This plan delivers 10,020 calories from 2.2 kg of food in five feeds: a hot breakfast, an hourly graze on the move, a hot break, dinner and an evening top-up.

It assumes 8 to 9 hours of heavy output, such as hauling a sledge or a long day on skis. Calories are worked out per gram from McCance and Widdowson's values and rounded to the nearest calorie; the two bars use our own label figures. Branded foods vary by a few per cent, so check your labels.

Hot breakfast, 1,350 calories

• 150 g porridge oats: 572
• 60 g skimmed milk powder: 209
• 50 g white sugar: 197
• 50 g butter: 372

Cook the oats in water and let the milk powder do the job of milk. Hot, soft food goes down in the cold when chewing does not. Some people crumble a soft bar into the pot instead, which is the porridge method.

The working-hours graze, 4,492 calories

• 2 dense 120 g bars: 1,060 (two Phoenix Bars, for example, Salted Caramel at 529 and Ginger at 531)
• 150 g mixed nuts: 872
• 150 g milk chocolate: 778
• 100 g salami: 438
• 100 g Cheddar: 416
• 100 g fudge: 435
• 100 g dried dates: 235
• 50 g shortbread: 258

That is 990 g of food at 4.5 calories per gram. Split it into nine bags of about 500 calories and eat one every hour, so nobody has to make decisions when tired. Nothing in the bags needs a stove or a long stop. A trained gut handles this rhythm and an untrained one does not, which is why gut training is a job for the months before you leave.

Hot break, 886 calories

• 60 g drinking chocolate powder: 226
• 40 g skimmed milk powder: 139
• 60 g digestive biscuits (about four): 278
• 40 g peanut butter: 243

Where conditions allow, stop for a hot drink made thick with milk powder. On a cold day the warmth is half the point.

Dinner, 2,086 calories

• 200 g dried pasta, weighed dry: 686
• 40 g olive oil, about 3 tablespoons: 360
• 100 g Cheddar: 416
• 100 g salami: 438
• 25 g butter: 186

The oil is the trick: 40 g adds 360 calories and no extra volume to the pot. Freeze-dried expedition meals get boosted the same way, with oil or butter stirred in on top of whatever the pouch label says.

Evening top-up, 1,206 calories

• 50 g drinking chocolate powder: 188
• 40 g skimmed milk powder: 139
• 100 g shortbread: 515
• 60 g peanut butter: 364

Eat it in the sleeping bag if you have to. Going to sleep with food on board is part of the plan.

Day total: 1,350 + 4,492 + 886 + 2,086 + 1,206 = 10,020 calories from 2,215 g of food, an average of 4.5 calories per gram. It carries about 310 g of protein, mostly from the milk powder, cheese, salami, nuts and the two bars.

For a strongman-style day at home, the same total splits into six feeds of about 1,670 calories every two and a half hours, with two of the six taken as gainer shakes or high calorie drinks and the food drawn from the bulking guide. For more foods ranked by calories per gram, see calorie-dense foods and, for the extreme end, high calorie low volume foods.

Can your body absorb 10,000 calories in a day?

Usually, but only if the food arrives steadily across the whole waking day: the gut has a speed limit, and 10,000 calories in a few big meals runs straight into it.

Carbohydrate is the best-studied example. Asker Jeukendrup's 2014 review in Sports Medicine explains that the gut's main glucose transporter saturates at around 60 g of carbohydrate an hour. Mixing glucose with fructose raises the ceiling, with one study recording about 1.26 g a minute, roughly 75 g or 300 calories an hour. Fat digests more slowly again, and a large fatty meal can sit for hours.

This is why the people who burn the most rarely manage to eat it back. At the Western States 100-mile race, measurements by Brent Ruby's group put the average runner's spend at 16,310 calories over 26.8 hours, as summarised on Jeukendrup's mySportScience site. At 300 calories an hour, replacing that would take more than 54 hours of eating.

So the approach that works at 10,000 is drip-feeding: moderate, dense feeds every hour that never overwhelm the system, with a slice taken as hot drinks (about 700 calories in the plan above). At this level, ease of eating decides what actually gets eaten. Shaun Weston, who took our bars on a South Pole expedition, wrote in January 2026: "Easy to eat, even at -45c." Calories per gram and ease of eating in the cold are the first two tests in our ranking of the best energy bars for expeditions, and self-supported desert racers live by the same rule, as our Marathon des Sables training guide explains.

How much weight will you gain eating 10,000 calories a day?

On paper, about a kilogram of body fat a day, because a surplus of 7,500 to 8,000 calories is close to the 7,700 calories stored in a kilogram of fat.

• An average man (NHS guide 2,500): 10,000 minus 2,500 is a 7,500 surplus; 7,500 divided by 7,700 is 0.97 kg.
• An average woman (NHS guide 2,000): an 8,000 surplus; 8,000 divided by 7,700 is 1.04 kg.

In practice less of it is stored. In a 1995 study by Tracy Horton and colleagues in the American Journal of Clinical Nutrition, men overfed by 50% for 14 days stored 75 to 85% of the extra calories when the surplus was carbohydrate, and 90 to 95% when it was fat; the rest was burned off. Applied to a 7,500 calorie surplus, that is 5,600 to 7,100 calories kept, or roughly 0.7 to 0.9 kg of fat-equivalent.

The scale the next morning usually shows more than this, and it misleads. It also weighs the 2 kg or more of food still working through you, plus water held with extra carbohydrate and salt, and that part passes within a few days. Keep it up for a week without the output to match, though, and the fat maths wins: roughly 5 to 7 kg.

How to do the 10k calorie challenge (rules and food list)

There is no official rulebook: the 10k calorie challenge usually means eating 10,000 calories inside one day, counted from labels or weighed portions, with drinks included.

Most attempts set their own rules, and some videos shrink the window to 10 hours. If you are going to try it, these keep it honest:

• One clock: a calendar day, or 24 hours from the first bite.
• Every calorie counted from the label or a kitchen scale, sauces and drinks included.
• Stop if you feel unwell. Finishing is not worth a day of being sick.

The easiest food list is the densest per mouthful, with a share taken as drinks:

• 1 litre of whole milk plus 100 g of skimmed milk powder: about 1,000 calories (649 + 348).
• Shop-bought 400 g cheese and tomato pizza: about 1,090.
• Shortbread: 515 per 100 g.
• Chocolate spread: 575 per 100 g.
• Mixed nuts: 581 per 100 g.
• Peanut butter: 194 for two tablespoons (32 g).

Get half of it done by mid-afternoon, because the last 3,000 calories are the hardest. As a weight gain strategy it teaches nothing: gaining is won by surpluses you can repeat, and the repeatable versions of extreme eating are the 7,000 calorie meal plan and the 8,000 calorie guide. And a quieter note: if your interest in extreme numbers comes from a difficult relationship with food rather than from sport, this is not the right page, and speaking to your GP will do more for you than any meal plan.

Frequently asked questions

How many meals is 10,000 calories?

Five to ten, depending on the job. The expedition plan above uses five feeds, one of which is nine hourly bags. Myprotein's account of Luke Stoltman's day has five sittings, counting a pudding, and the ten-meal plan from Hafthor Bjornsson's Instagram, reproduced by Ladders, spreads it further. Three meals of 3,300 calories is beyond most stomachs.

Can you eat 10,000 calories every day?

Very few people do for long. Even on Fiennes and Stroud's 95-day Antarctic crossing, intake averaged about 5,100 calories a day against a far bigger burn. Sustained 10,000 calorie days are mostly reported by strongmen; for anyone not burning it, each day adds close to a kilogram on paper.

Which foods have the most calories per gram?

Pure fats come first: olive, rapeseed and other cooking oils are 899 calories per 100 g. Then salted macadamia nuts (748), butter (744), peanut butter (607), mixed nuts (581), chocolate spread (575) and milk chocolate (519), all McCance and Widdowson values. That is why the plan above leans on butter, oil, nuts and chocolate.

Did Michael Phelps really eat 12,000 calories a day?

No. In his autobiography No Limits, Phelps called the 12,000 figure a myth and estimated his real intake at "maybe eight to ten thousand calories per day", as NBC Sports reported in 2020. It is still one of the most repeated numbers in sports nutrition, and one of the least accurate.

Related guides

7,000 calorie meal plan · 8,000 calorie guide · Polar expedition nutrition · Antarctica solo crossing food · Calorie-dense foods · Ultra-endurance and expedition guide · High calorie bars

Sources: NHS, Understanding calories; Stroud and others, European Journal of Applied Physiology, 1997; Hall, International Journal of Obesity, 2008; Horton and others, American Journal of Clinical Nutrition, 1995; Jeukendrup, Sports Medicine, 2014; mySportScience on the most extreme daily burns; McCance and Widdowson's Composition of Foods Integrated Dataset 2021; NBC Sports on Michael Phelps; Myprotein on Luke Stoltman.

Written by James Frost, founder of Flaming Phoenix. Updated October 2026: the meal plan now lists every gram and calorie from McCance and Widdowson's data, with new sections on what 10,000 calories looks like and on weight gain, and polar figures from Stroud's Antarctic study. James packs every order and answers every email himself, and before launching spoke to about 150 ultra-endurance athletes, expedition people and people who struggle to eat enough. You can reach him at jfrost@flaming-phoenix.co.uk or through the contact page.