The Ultimate Insider’s Guide to Thor Bjornsson’s Diet

"The Mountain"'s own nutrition coach gives the inside scoop on exactly what he eats.

Six feet, nine inches tall. Over four hundred pounds. The 2018 winner of the World’s Strongest Man™ (and, sure, The Mountain on HBO’s Game of Thrones) Hafthor Bjornsson literally carries hundreds of pounds of muscle on his frame and one of the most common questions we hear asked is What Does Thor Bjornsson Eat?

He actually used to be a very slim basketball player but to maintain his current level of muscle he eats over 8,000 calories per day. But for this unusually lean strongman, the foods he eats are chosen very carefully.

We spoke with his nutrition coach Stan Efferding — who, interestingly, also handles the nutrition for his fellow World’s Strongest Man winner Brian Shaw — to learn what nutrients are important for Bjornsson, which foods he avoids, and how he manages to cram so many calories into his day without suffering from bloating and digestive problems.

“When Hafthor came to me at 435 pounds and said he was getting fatter not stronger I already knew what I’d see,” Efferding told BarBend. “The blood tests saw he was high blood sugar, high blood pressure, had fatty liver disease, and metabolic syndrome.”

He brought Bjornsson’s weight down to 395 pounds, then brought him all the way up to a healthier 450 pounds using what he calls The Vertical Diet. Here’s what’s included.

Editor’s note: The content on BarBend is meant to be informative in nature, but it shouldn’t take the place of advice and/or supervision from a medical professional. The opinions and articles on this site are not intended for use as diagnosis, prevention, and/or treatment of health problems. Speak with your physician if you have any concerns.

Hafthor Bjornsson’s Calories and Macros

  • Protein: ~1 gram per pound of bodyweight
  • Fat: ~0.4 grams per pound of bodyweight
  • Carbohydrates: The rest of the calories

For the Mountain’s diet, that means consuming somewhere in the area of 5,000 calories every day just from carbohydrates, but that doesn’t mean he’s eating huge bowls of pasta, brown rice, oatmeal, and other bodybuilder staples.

Hafthor Bjornsson’s calories are anywhere from 8,000 to 10,000 calories in a day, and if his digestion isn’t running as smoothly as possible, it’s easy to wind up bloated, gassy, and uncomfortable with that much food.

“Making that edible is kind of the hardest part,” says Efferding. “It’s the logistics of maintaining that kind of mass. How do you eat that much food and not suffer from diarrhea and gas?”

[Related: Our complete guide to the Vertical Diet]

Vertical Diet Nos

What Thor Bjornsson Doesn’t Eat

To that end, the diet eschews a lot of fibrous carbs, the sorts of filling foods that can be useful for weight loss but can make it harder to gain weight. The foods that are limited include

  • Oatmeal
  • Bread
  • Brown rice
  • Legumes

Exceptions are made if they’ve been sprouted or fermented (when it comes to bread, an example would be sourdough), but while it’s not uncommon for Bjornsson to have a small bowl of oatmeal here and there, the vast majority of his carbohydrates come from low-fiber, fast-digesting white rice.

Efferding also makes an effort to minimize high FODMAP vegetables. That stands for Fermentable Oligo-, Di-, Mono-saccharides And Polyols, types of carbohydrates that are resistant to digestion and are often avoided by people with irritable bowel syndrome and other digestive issues.(1)(2)(3) The basic idea is that since Bjornsson is eating so many calories, digestive hiccups that might go unnoticed when a healthy person is eating 2,000 calories can be magnified and cause issues at 8,000-plus calories, even if they haven’t been diagnosed with IBS. Some studies have found reducing FODMAPs to improve gut health and exercise-related indigestion.(4)(5)

So in addition to limiting grains and legumes, Bjornsson also avoids:

  • High raffinose vegetables (broccoli, cauliflower, asparagus etc.)
  • Garlic
  • Onions

“High raffinose vegetables like broccoli and asparagus can impede or impair iodine uptake,” explains Efferding. (Raffinose is a type of sugar that’s resistant to digestion.) “That can be very important for athletes who are training hard and sweating a lot, because it can affect the thyroid function and metabolism. I have a very specific reason I’d prefer to use a low gas vegetable that’s cooked instead, such as spinach, cucumbers, squash, potatoes, even fruits.”

Andrei Iakhniuk/Shutterstock

Thor Bjornsson’s Diet Staples

  • Red meat (a denser source of B-vitamins, creatine, and iron than most other protein sources, though whole eggs and fatty fish are also used)
  • White rice
  • Spinach
  • Potatoes
  • Whole fruit
  • Other low-FODMAP vegetables (especially red peppers, squash, tomato, and berries)
  • Fruit juice (for extra carbohydrates that are easy to digest)
  • Coconut water (for potassium)
  • Bone broth (high in glutamine, may improve digestion)

A classic Efferding meal is what he calls a “monster mash:” ground beef, white rice, and bone broth. Bjornsson recently shared a full day of eating and most of his meals followed a template of red meat, white rice, broth, spinach, bell peppers, and either coconut water or fruit juice.

Again, the focus is on keeping appetite high and slow digesting foods low.

“I put fruit in there and it stimulated the thyroid production, or at least conversion into a usable form, and it increases body temperature,” says Efferding. “I’m pretty specific with the foods I recommend because they provide so many positives. But I’m not trying to be a zealot about those foods or claim other foods are bad for you.”

[Related: 10 ways to naturally increase your appetite]


Thor Bjornsson Supplements and Nutrients

What about Thor Bjornsson’s supplements? Efferding doesn’t rely on supplements all that much — if the Vertical Diet is followed, he says, there shouldn’t be many deficiencies — but there are a few micronutrients that he emphasizes with his clients.

  • Choline (whole eggs)
  • Vitamin B12 (red meat)
  • Folate (leafy greens, whole eggs)
  • Sodium (added to meals — see our sodium article to learn why)
  • Potassium (coconut water and potatoes)
  • Magnesium (supplemented)
  • Vitamin D3 (supplemented)

Despite his big emphasis on digestive health, he doesn’t typically use probiotic bacteria or digestive enzymes as he feels there isn’t quite enough evidence. However, he does sometimes find himself recommending hydrochloric acid pills. Why?

“Hydrochloric acid, usually paired with peptin, might be of benefit particularly among people who might be low acid,” he says. “That’s one of the first things I try to resolve for people taking antacids because without adequate acid, you won’t digest foods and absorb micronutrients, particularly minerals.”

He starts with one capsule at the beginning of a meal and might bring it up to two or three until the client gets a burning sensation. If that regimen is continued, they may get better at producing acid and digesting food, so he considers a temporary fix. Dextrose is sometimes added to rice as well, as it may stimulate the production of amylase, a digestive enzyme that helps us to break down carbohydrates. 

For liver health, Efferding takes blood tests to detect liver enzymes like AST and ALT, and if they’re too high he might suggest Tudca (Tauroursodeoxycholic Acid) and N-Acetyl Cysteine, which he has found to be useful at reducing liver enzymes and increasing appetite.

But of course, the inclusion of blood tests and adding supplements to correct potential liver problems is very high level stuff that shouldn’t be attempted without the supervision of a doctor.

[Related: The athlete’s guide to magnesium]

hafthor bjornsson
lev radin/Shutterstock

The Takeaway

It’s both pretty complicated and not all that complicated: red meat, white rice, and low FODMAP vegetables are the bulk of Thor Bjornsson’s diet.

Using that template and controlling calories helped Efferding take forty pounds off of Bjornsson’s frame, then add fifty pounds back onto it, and along with some highly individualized supplementation based on blood tests, this reduced indigestion and fixed his high blood sugar and high blood pressure.

It’s a fascinating and entirely unique approach to dieting that Efferding says is well suited to both high calorie and low calorie diets. But it’s somewhat radical, and it’s important to remember that you should speak with a physician before making any changes to your own diet.

Featured image via Hafthor Bjornsson on YouTube.


1. Barrett JS, et al. Fermentable oligosaccharides, disaccharides, monosaccharides and polyols (FODMAPs) and nonallergic food intolerance: FODMAPs or food chemicals? Therap Adv Gastroenterol. 2012 Jul;5(4):261-8.
2. Turco R, et al. Does a low FODMAPs diet reduce symptoms of functional abdominal pain disorders? A systematic review in adult and paediatric population, on behalf of Italian Society of Pediatrics. Ital J Pediatr. 2018 May 15;44(1):53.
3. Ong DK, et al. Manipulation of dietary short chain carbohydrates alters the pattern of gas production and genesis of symptoms in irritable bowel syndrome. J Gastroenterol Hepatol. 2010 Aug;25(8):1366-73.
4. Sloan TJ, et al. A low FODMAP diet is associated with changes in the microbiota and reduction in breath hydrogen but not colonic volume in healthy subjects. PLoS One. 2018 Jul 26;13(7):e0201410.
5. Wiffin M, et al. Effect of a short-term low fermentable oligiosaccharide, disaccharide, monosaccharide and polyol (FODMAP) diet on exercise-related gastrointestinal symptoms. J Int Soc Sports Nutr. 2019 Jan 15;16(1):1.