Insulin resistance, or IR for short, has become so common today that it has almost imperceptibly turned into a part of everyday life. Many people only encounter it when they start feeling that something is wrong: they tire more easily, lose weight with greater difficulty, feel hungry more often, or constantly crave sweets. In such cases, a diagnosis often arrives, but the real question is rarely asked: what is actually happening in the body?
To understand this, it’s worth starting from the basics. When we eat, especially if the food contains carbohydrates — whether it’s sugar, bread, pasta, or even fruit — our blood sugar level rises. The body responds by producing insulin. Insulin is a hormone whose job is to help nutrients enter the cells. It acts like a key that opens the door, allowing the cells to take up the energy circulating in the blood.
This process is completely natural and is not a problem in itself. The trouble begins when this system is under constant strain. In modern lifestyles, there is rarely a real break between meals. Breakfast, mid-morning snack, lunch, afternoon snack, dinner, and often snacking in between as well. This means that insulin levels remain elevated practically all day long, and the body never gets the chance to return to a resting state.
Over time, the cells adapt to this constant stimulation and respond less and less to insulin. This is insulin resistance. It’s like continuously pressing a doorbell: after a while, it no longer triggers the same reaction. The body responds by producing even more insulin, trying to achieve the same effect. This creates a slowly intensifying cycle in which more and more insulin is needed, while the system becomes increasingly less efficient.
This is the point where the role of diet becomes truly important. The Functional Carnivore approach is not a trendy fad, but a tool that tries to lead this overloaded system back to a simpler, more stable way of functioning. Its foundation is that it drastically reduces carbohydrate intake, which significantly lowers the insulin load. When the body no longer receives a continuous external source of glucose, it is forced to turn to another energy source and gradually shifts to fat-based metabolism.
This is where it becomes especially important what kind of fat the body runs on. In the initial period, animal fats play a key role. Butter, ghee, tallow, or simply fattier cuts of meat not only provide calories but also deliver stable, well-utilizable energy. When the body is not yet efficient at using fat, these foods help bridge the transition period. If this is missing, an “energy-deficient state” can easily develop, which manifests as fatigue, irritability, and cravings. Many people then think the diet isn’t working, when in reality their body simply isn’t getting enough fuel.
At this point, many people ask: if you don’t consume carbohydrates, where does the body get its sugar from? This is where a completely natural process comes into play: gluconeogenesis. This means the body is capable of producing the necessary amount of glucose itself, primarily from protein. This is necessary because there are certain cells that cannot function exclusively on fat. However, your body solves this problem on its own, so there is no need for you to supply sugar from the outside.
That said, it does not mean you should consume unlimited amounts of protein. If too much protein enters the system, the body converts part of it into glucose, which once again triggers an insulin response. That’s why the focus is not on the “as much meat as possible” principle, but on balance. Alongside the right amount of protein, fat becomes the primary energy source — and especially in the beginning, it’s worth consciously ensuring that enough animal fat is included in the diet.
There is, however, another, even less known factor that plays a key role in this transition: sodium. When carbohydrate intake decreases, the body loses more water and, along with it, more sodium. Sodium is an essential mineral that is indispensable for the proper functioning of the nervous system, muscles, and fluid balance. Most people get it in the form of table salt, but it’s important to understand that salt is not pure sodium. Table salt contains about forty percent sodium, which means that to get one gram of sodium, you need roughly two and a half grams of salt.
On a low-carbohydrate intake, the daily sodium requirement increases significantly. In general, 4–6 grams of sodium per day is recommended, which corresponds to about 10–15 grams of salt. This may sound like a lot at first, but in practice, spread out across meals or added to water, it is perfectly manageable. If this replacement is neglected, headaches, dizziness, fatigue, or even strong cravings for sweets can appear very easily. Many people mistakenly blame the diet for these symptoms, when in reality it is simply a sodium deficiency.
At the beginning, the simplest approach works best. There is no need to think in terms of complicated recipes or look for substitute foods. The essence of the system lies precisely in its simplicity: eggs, meat, natural fats, water, and adequate salt intake. This is where the process begins that allows the body to gradually adapt to the new way of functioning.
The first period is not always easy. It is completely normal if someone feels more tired, more irritable, or experiences stronger sweet cravings in the first one to two weeks. This is not a mistake — it is part of the transition. The body had previously run primarily on carbohydrates and is now learning to use a completely different energy source.
Functional Carnivore is therefore not a system built on prohibitions, nor is it a permanent state that everyone must follow for the rest of their lives. It is much more a tool to help the body find its way back to a more stable and predictable way of functioning. Insulin resistance does not develop overnight, but the right steps in the right direction can bring noticeable changes in a relatively short time. The real question is not whether it works, but how we use it.