Metabolic Flexibility for Adventurers

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When Bjørn Olson received some troubling news from his doctor, he took a hard look at the foods he was eating and rethought his dietary approach to fueling his bikepacking adventures and everyday life. In this piece, he questions today’s standard approach to nutrition and shares some lessons he’s learned after several years of following a metabolically flexible diet…

A wet sucking sound accompanied each step as I lifted my foot up and out of the spongy tundra. I’d then test the space between the pillowy jack-o’-lantern-sized tussocks to locate the least wet place to set my foot, then heave my laden fatbike forward before taking the next sloppy, energy-draining step. Forward progress was painfully slow through the sub-Arctic mire. I scanned the rolling terrain ahead in search of a less energy-consuming path. Nothing but miles of soggy tundra met my gaze. Intense exhaustion and an acute swelling pain in my knee threatened to overwhelm me. I worried that I had overshot my abilities with this wilderness cycling route that involved a lot of bike-pushing.

Metabolic Flexibility for Adventurers

For more than two-thirds of my life, I have been an outdoor adventurer, which is to say that I have a deep familiarity with “bonking.” I know what drained depletion and ravenous hunger feel like. On long trips, my strategy had always been to eat frequent, high-carbohydrate snacks to recharge my flagging blood sugar. If snacks ran low or were entirely consumed, all thoughts focused on food and the next resupply, and I would become sluggish and hangry.

Over the years, I had grown used to achy joints and exhaustion, but as I looked up at the miles of post-holing ahead of me, I felt a fatigue deeper and more concerning than usual. When I returned home from the trip, I visited the clinic for a check-up and to have a blood panel done. The results were sobering. I was overweight, developing metabolic syndrome, and, most alarming, I was becoming insulin resistant—the early signs of developing type 2 diabetes.

Metabolic Flexibility for Adventurers

My yearning for strenuous backcountry adventures was still strong, but it seemed as though the clock had been accelerated and that my days of adventure would soon be reined in. Although I was raised by a whole-foods, organic hippy momma and have lived a highly active life, diet, I assumed, was the root cause of my metabolic health going haywire.

I began searching for solutions to allow me to maintain my active lifestyle and regain optimal health. The dietary approach I had always followed was causing me to gain several pounds of body fat each year. My stamina and strength no longer felt optimal, my joints ached, and I was becoming insulin resistant. I had no clear idea, however, where or how to begin.

  • Metabolic Flexibility for Adventurers
  • Metabolic Flexibility for Adventurers

Through luck, coincidence, and one compelling presentation about decolonization and ancestral wisdom, I found what I consider to be nothing less than a miracle solution to the spectrum of ailments that plagued me. I stumbled across what it means to become a metabolically flexible fat burner through ancestral nutrition.

Digging into this line of investigation, I found a bottomless and wildly fascinating rabbit hole. Ancient ways of living and eating that worked for our species for hundreds of thousands of years are now being justified and supported by burgeoning science. More importantly, however, tens of thousands of individuals, like me, who have reached dead ends with the modern standard of care, are self-experimenting with this way of eating and are course-correcting away from the diseases of civilization: cancer, heart disease, type 2 diabetes, and Alzheimer’s.

Metabolic Flexibility for Adventurers

As I began to peer under the first onion layers, I started to comprehend that we are a species of hominid that has lived in direct contact with the natural world for the overwhelming majority of our time on the planet. It struck me that I had never had the imagination or bothered to consider, “What is a species-appropriate diet for humans?”

Our ancestors, I began to understand, ate what they could kill, scavenge, or forage, and often underwent protracted periods without eating. Human beings are the surviving members in a branch of primates that, over millions of years, gradually adapted away from big, biota-filled guts, which require continuous feeding, and that can extract nutrition from plant fiber. When our ancient ancestors moved out of the trees and into the savanna several million years ago, they began consuming animal protein and fat. The big guts shrank and were slowly exchanged for big brains. This is called the expensive tissue hypothesis.

  • Metabolic Flexibility for Adventurers
  • Metabolic Flexibility for Adventurers

Our genes have not changed in any significant way since the Agricultural Revolution some 10,000 years ago (depending on what region of the world your ancestors are from). Our diets, however, have increasingly diverged from the rich and varied nutrition and eating patterns our species has been programmed to thrive with over hundreds of thousands of years. This nutritional divergence has further accelerated over the last 50 or so years. High fructose corn syrup, industrially processed and highly inflammatory seed oils (canola, soy, peanut, corn, vegetable, etc.), refined grains, and other hyper-palatable, nutrient-poor, center-aisle food-like products are all modern additions to the human diet—none of which our ancestors would recognize as food.

Bjorn Olson, Caribou Hunting, Alaska

It is sobering to consider that over 55% of Americans are either diabetic or pre-diabetic, that roughly 70% are either overweight or obese, and that only 12% of American adults are considered metabolically healthy! This way of eating has given me a fighting chance to avoid becoming another member of these grim statistics.

At the outset of my dietary experimentation, I struggled with the idea that the goal should be to consume the majority of my calories from fat and to dramatically restrict carbohydrates. Although I grew up in Alaska and knew that all Indigenous Alaskans had eaten this way for thousands of years. My Western conditioning was deeply ingrained. A light went on for me, however, when I first read that of the three macronutrients (fat, protein, and carbohydrates) that there is no such thing as an essential carbohydrate.

  • Metabolic Flexibility for Adventurers
  • Metabolic Flexibility for Adventurers

Certain cells in our bodies require glucose to function, but if you never ate another candy bar, slice of bread, or bowl of rice for the rest of your life, those cells would function perfectly. Human bodies can manufacture all the glucose they need. Human beings cannot function, however, for long, without essential fatty acids, essential amino acids, essential vitamins, and essential minerals.

Bjørn Olson, Winter Fat Biking, Alaska

When I began to consume a high-fat/low-carbohydrate diet, a few fascinating and profound things began to occur, which led me to believe that I was on the right path. One of the first things I noticed was that I immediately lost several pounds of water weight that I had no idea why I was carrying around. Every gram of carbohydrate in our bodies, it turns out, is supported by three to four grams of water. Once I ditched the carbs, this water was excreted. I felt lighter, and my joints hurt less. The next thing I noticed was that I was off the blood sugar roller coaster, and I could go and go for many hours between meals without experiencing the familiar and dreaded bonk.

In most cases, people who prioritize healthy fats and protein as the cornerstone of their diet adopt intermittent fasting or time-restricted eating patterns. Healthy fats and protein are satiating, and once the body remembers how to extract energy from these substrates by becoming fat-adapted, the hormone insulin drops, and a cascade of fascinating things begin to happen.

  • Metabolic Flexibility for Adventurers
  • Metabolic Flexibility for Adventurers

When insulin is present, we cannot tap into our stored body fat for energy because insulin is a storage hormone. By abstaining from snacks and meal frequency and by greatly reducing carbohydrates, insulin drops. With insulin levels low, our bodies can tap back into our fat stores to use for energy.

This is the remarkable adaptive strategy that allowed our hunter-gatherer ancestors to survive times of hardship, and this is the cornerstone of what it means to become metabolically flexible: we eat nutritious food and extract energy from it, but when we don’t eat, our fat-burning mitochondria begin to pull the fat off our bodies and use it for fuel without discrimination or unnecessary hunger pangs. Furthermore, our brain function and moods improve when we are off the blood sugar roller coaster and rely on ketones, rather than glucose, as the primary fuel source.

Bjorn Olson, Caribou Hunting, Alaska

As the first weeks and months went by, I began to experiment. I found it hard to believe that my body could run on its own storage fuel and that losing excess body fat could be so simple. My 16-to-24-hour fasts (skipping breakfast and or breakfast and lunch) eventually became reflexive for me at home, but I wondered how I’d perform on bike trips. Breakfast had always been a morning ritual before starting long days on the saddle, and my Western conditioning about breakfast being the most important meal of the day was deeply ingrained.

Much to my surprise and delight, I was able to get going with nothing more than a cup of black coffee, then ride well into the day before feeling the urge to eat a late afternoon snack. I was elated to discover that I had conditioned my metabolism to run on fat rather than carbohydrates.

  • Metabolic Flexibility for Adventurers
  • Metabolic Flexibility for Adventurers

Three years in, I still marvel at the fact that, with practice and discipline, I was able to return to my ancestral programming and am now able to use both exogenous and endogenous calories for fuel. I am no longer deeply reliant on glucose, and I take great satisfaction when I consider that my body has remembered how to use its built-in surplus for the energy it needs when it needs it. I feel like I have a superpower.

Two years after adopting this way of eating, I returned to the clinic for another check-up and to have blood work done again. I had lost more than 30 pounds. My insulin resistance had reverted to healthy insulin-sensitive levels, and my markers for metabolic dysfunction had been corrected. And, despite the prevailing wisdom that saturated fat and cholesterol clog arteries, I had a coronary calcium score of zero, which is as good as it gets. I had dodged an all-too-common bullet.

Metabolic Flexibility for Adventurers

I do not consider this way of eating to be a diet. The word diet denotes something to do temporarily. I intend to eat and fast this way for the rest of my life. There is still a lot to learn and certain tweaks to be made, but becoming metabolically flexible has made too many profound improvements in my life to list. I can no longer imagine returning to the diseased state I had been in for the meager reward of a quick dopamine rush from sugars, industrial seed oils, highly refined carbohydrates, and other hyper-palatable, ultra-produced foods. The simple and timeless advice I now follow comes from the “godfather of fitness,” Jack LaLanne: “If man made it, don’t eat it.”

  • Arctic Bikepacking Trip, Bjorn Olson
  • Arctic Bikepacking Trip, Bjorn Olson

Single-ingredient whole foods are what I consume, and much of it is wild-caught fish and game that I procure myself. This is one of the great joys of living in Alaska—a state that, up to now, has prioritized and managed its healthy renewable resources. When my freezer and pantry run low on wild-caught or foraged food, I do my best to purchase regeneratively and locally raised/grown food.

Although I now eat far fewer meals than I used to, every meal I eat is delicious, and I eat to satiety. However, I am not a zealot. In Mark Session’s book, The Primal Blueprint, he states that we should aim high but accept that 80% adherence is more reasonable. Conscious treats (not cheats) should be factored into a life worth living.

Bjørn Olson, Winter Fat Biking, Alaska

We have become conditioned by modernity and culture to believe that grocery stores, supermarkets, and all they contain, are normal. Highly subsidized grains and monoculture agriculture have wildly transformed our diets and health and the health of the environment over the last century. Most of us have some idea about which foods are more-or-less healthy or nutritious, but I had never considered just how many of these foods could be deleterious to long life and robust health. If and when I feel deprived, I consider what my future self will say about the choices I make now to remain in or to slip away from robust metabolic health.

  • Bjorn Olson, Caribou Hunting, Alaska
  • Bjorn Olson, Caribou Hunting, Alaska

Mountaineering, paddling, bikepacking expeditions, and wilderness excursions are embedded into my identity and are the sacred methods I use to recharge my being. I am open-eyed and under no illusion, however, that someday I will have to reign in expectations about my limits in the backcountry. Relying on ancestral wisdom to break bad habits and rediscover optimal health has provided me with a new lease. My only regret is that I didn’t learn about metabolic flexibility sooner.

Recipes for Bikepacking Adventures

Note: Before employing these (and many more) high-fat/low-carb recipes on an adventure, be sure to become fat-adapted ahead of time by following a ketogenic diet for two to six weeks. When coming from a Standard American Diet (SAD) or any other high-carb diet, the adaptation to a fat burning metabolism can be challenging for some. A camping trip is not the ideal time to transition your metabolism to prefer fat as its primary fuel source.

Being in a ketogenic state is binary. Either you are in ketosis, or you’re not. In order to reach a state of ketosis, you can either fast for 18 or more hours (generally speaking) or by consuming a ketogenic diet and tracking your macronutrients, which, in general, are as follows: Carbs 5-10% (usually less than 50 grams), Protein 10-20%, and fats 70-80%. Full adaptation, however, requires time and listening to your body. You’ll know when you are fat-adapted when you can easily and reflexively skip a meal without becoming hangry.


  • Hard Salami
  • Hard Cheese
  • Nuts and Nut Butter
  • Jerky
  • Pemmican
  • Instant coffee with Heavy Cream Powder or MCT Powder
  • Sardines
  • Smoked Salmon
  • Grass-fed Butter
  • Beef liver chips
  • Electrolytes
Metabolic Flexibility for Adventurers

Sample Meals

Creamy Chicken with or without Broccoli

Lightweight version (Keto or Carnivore), Serves 2



Fill 2 quart pot ⅔ full of potable water with 2 cups of freeze dried chicken, cover with lid, place on fire embers or atop a camp stove and let it come to a boil. If desired, add broccoli at the outset, too. Once the water begins to boil, reduce heat and cook for 5 to 10 minutes on low to medium heat. Test a piece of the chicken. You will know by its texture if it’s fully reconstituted. Once it is, move onto the next step. While simmering on low heat, add ½ packet of Pesto or Alfredo seasoning and liberal amount of freeze dried heavy cream powder, and two big spoons of cheese powder, stir in and allow to cook for several minutes. Add a big handful (or two) of shredded parmesan cheese, remove pot from heat, do not stir and let it sit with the lid on for a few minutes allowing the cheese to melt. Serve. Add nutritional yeast and salt to taste. To make the “Heavy Version,” replace freeze-dried heavy cream with full fat cream cheese.

Cheesy Bacon and Eggs

Serves 2



Place a 2 quart pot on a fire or stove, add a big spoonful of butter, two handfuls of bacon crumbles and stirr. Cook the bacon until it’s crispy. Remove bacon from the pot but not the grease. Add 1 quart of water and bring to a boil. Once water is boiling, reduce heat and slowly add egg powder. Stir in a little at a time. Once the eggs have reconstituted, cooked and have reached the desired consistency, add the pre-cooked bacon. Remove from heat and add a layer of sliced cheddar cheese. Keep the lid on for several minutes to allow the cheese to melt. Serve. Add salt, pepper and nutritional yeast to taste.

Pemmican and Ground Beef Scramble


  • 4 to 6 oz square of pemmican
  • 2 cups of freeze dried ground or shredded beef
  • Powdered eggs
  • Freeze dried cheddar cheese
  • Nutritional yeast
  • Salt and pepper


Fill a 2 quart pot ⅔ full of water, then add pemmican and two cups of freeze dried beef. Place over stove or fire, let it come to a boil, reduce heat and let simmer for 5 to 10 minutes. Sample the beef to ensure it has reconstituted. Once the beef has reconstituted, slowly stir in egg powder until you reach the desired consistency (leave a little moisture to absorb the cheese powder). Stir in 1 to 2 tablespoons of cheese powder. Remove from heat and let stand for several minutes. Add salt, pepper and nutritional yeast to taste.

There are countless high fat/low carb recipes that one can learn to shop for, prepare and cook that work well for human-powered trips. These are just a few of my personal favorites. Although I have always avoided using pre-packaged, freeze-dried meals, commercial options do exist.


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Disclaimer: The opinions in this piece were not written by a nutritional expert and are based on personal experience. They should not be used as medical/dietary advice. Claims made in some sources have been contested by experts. Always consult with a licensed professional before implementing any changes to your dietary regimen.

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