The inner forge
In the northern regions, cold is not a simple meteorological condition; it is a demanding master who dictates our biology. When the thermometer drops well below zero, the body must mobilize considerable energy to maintain its internal temperature at 37 degrees. This process, thermogenesis, is a forge that never stops. To fuel this inner fire, glucose is a poor fuel: it burns quickly, runs out quickly and leaves behind ashes of inflammation. Fats, on the other hand, are the hardwood that burns slowly and surely. By adopting a diet rich in lipids and low in carbohydrates, we offer our metabolism the ideal fuel to face the rigors of winter. It is not a modern dietary choice, it is a necessity for survival written into our cells.
I have often noticed that the people who fear the cold the most are often those whose diet is richest in sugars. Their bodies, accustomed to relying on glucose, are unable to effectively access their own fat stores. They live in a state of constant thermal vulnerability. Conversely, one that is fat-adapted—one that is in a state of nutritional ketosis—has remarkable thermal resilience. It is as if a dull heat emanates from within, a stability which does not depend on the thickness of the coat but on the quality of the metabolism. The cold then becomes an ally, a signal that activates our deepest and most efficient combustion mechanisms.
The danger of blood sugar spikes
In a hostile environment, instability is a mortal danger. Fast carbs create an illusion of energy, a heat spike followed by a sudden crash. In the middle of winter, this glycemic 'crash' is accompanied by a drop in body temperature and a reduction in alertness. This is the moment when we make mistakes, when fatigue becomes paralyzing. Fats provide 'steady' energy, a straight line of power that can be counted on for hours or even days. This metabolic endurance is what allowed our ancestors to hunt for days on end in the snow, without needing to snack every two hours.
This stability transforms our relationship to effort. We no longer chase the next dose of sugar to keep moving forward. We draw from an almost unlimited reservoir. For me, this feeling of reliability is the greatest reward of a low-carb diet. Whether I'm splitting wood or walking across a frozen lake, I know my energy won't fail me. It is a form of physical freedom. We cease to be the slave of our hunger to become the master of our endurance. Cold teaches us that true strength lies not in explosion, but in persistence.
The memory of blood
Nordic populations did not become consumers of fats by chance or out of a taste for gastronomy. It is the result of ruthless selection over millennia. Those who did not know how to efficiently metabolize animal fats did not survive the Scandinavian winters. Our genes carry traces of this adaptation. We have optimized enzymatic mechanisms for the breakdown of lipids and the production of ketone bodies. Returning to a diet rich in fats is, in a way, 'awakening' genetic programming that was patiently waiting to be called upon. It's a homecoming, biologically speaking.
This genetic wisdom is often ignored by global nutritional recommendations, which attempt to impose a single model on populations with very different heritages. For a Scandinavian, a low-fat diet is a biological aberration. She goes against what her blood demands. By observing the culinary traditions of my ancestors — fatty salmon, reindeer, pastured butter — I see an intuitive understanding of this reality. They weren't counting calories, they were looking for density. They knew that fat was life. By honoring this heritage, we find a health that seems natural to us, because it is in accordance with our deep identity.
Quality over quantity
Not all fats are equal, especially in our latitudes. Northern fats are rich in omega-3 fatty acids, essential for fluid cell membranes and reducing inflammation. Herring, mackerel, cod liver are not only sources of energy; they are concentrates of protective nutrients. These fats are 'living', they carry within them the energy of the cold ocean. Likewise, butter from cows that graze in our summer meadows has a composition of fat-soluble vitamins (A, D, K2) that is much higher than industrial products. These nutrients are the guardians of our immunity during the months of darkness.
Consuming these local fats also means respecting earth ethics. We are not looking for processed vegetable oils from the other side of the world, but raw, minimally processed products that have a story. Animal fat, when it comes from animals raised with respect for their nature, is a noble food. It provides satiety that no other substance can match. A small portion of fatty fish is enough to quell hunger for hours, because the brain receives the hormonal signals of satisfaction it expects. This is the end of gluttony and the beginning of conscious nutrition.
Ketogenic synergy
Today, we are rediscovering the benefits of exposure to the cold — ice baths, cold showers, thinly covered winter walks. What our ancestors suffered by necessity, we seek by choice for its effects on health. Cold activates 'brown adipose tissue', a special fat that burns calories to produce heat. And guess what that brown fat's favorite fuel is? Circulating fatty acids. There is a perfect synergy between exposure to cold and a ketogenic diet. Cold speeds up ketosis, and ketosis makes it easier to adapt to cold. It’s a virtuous circle of vitality.
Practicing exposure to the cold while being adapted to fat radically transforms the perception of winter. We no longer endure the season, we live it intensely. Heat shock becomes a rush of adrenaline and dopamine that boosts mood and strengthens the immune system. It is a form of meditation through the body. We learn to stay calm in the discomfort, to breathe through the bite of the frost. This physical discipline is reflected in our mental clarity. The cold cleanses the mind as it cleanses the landscape. By combining the rigor of the climate and the purity of the diet, we achieve a state of balance that modern life, too comfortable and too sweet, has made us forget.
