Do Carbohydrates Fuel Humans… or the System?

Do Carbohydrates Fuel Humans… or the System?

by Laurent Glatz – for Athletic Carnivore

A human is not a sugar battery. Glycogen stores are limited, while fat reserves are massive. An adult stores only a finite amount of glycogen in the liver and muscles, roughly 2,000 to 2,400 kilocalories, whereas even a 65-kilogram athlete at just 6% body fat already has about 36,000 kilocalories stored as fat.

The ratio is overwhelming. For a muscular 80-kilogram carnivore man with moderate fat mass, the actual lipid reserve quickly rises to several tens of thousands of kilocalories. Biologically, this changes everything. It means the human body is not designed to rely constantly on external carbohydrate intake to keep producing energy. It is built to endure on a mixed metabolism dominated by fat as long as the effort intensity remains sustainable. Glycogen then serves as a tactical reserve, not a permanent energy foundation.

Glycogen: Tactical Reserve, Not Primary Engine

Here the extrapolation becomes striking. Consider an 80-kilogram muscular man working in a factory. If he were to operate as commonly believed—that is, primarily on glycogen to sustain his day—his actual autonomy would be negligible.

With 2,000 to 2,400 kilocalories of mobilizable glycogen, sustained physical exertion would deplete this reserve in a limited time. Under intense, repetitive effort, it could be severely drained within a few hours. This is precisely why the carbohydrate model works so well in industrial contexts: it allows rapid recharging, quick restarting, and fast refueling of a human machine asked not just to move, but to repeat, accelerate, carry, push, and start over under strict time constraints.

Conversely, if this same man is truly adapted to a carnivore diet, the logic shifts. He no longer depends solely on glycogen reserves. He largely switches to fat oxidation, maintains blood sugar through endogenous production, better conserves carbohydrate stores for intensity peaks, and can therefore work not just a few hours but entire days, week after week, as long as the effort remains mostly aerobic or moderately intense.

The central point is blunt: carbohydrates do not create work capacity. They mainly increase the ability to impose an artificially high work pace.

The Ideal Fuel for Productivity

Popular belief says a worker without carbohydrates collapses. Biology says otherwise. An organism adapted to fat can endure for a long, very long time, provided it is not forced to live through successive glycolytic spikes.

This is the distinction almost no one makes. We must separate the human capacity to perform real physical work from the industrial capacity to demand standardized output for hours on end. Traditional peoples could walk, carry, hunt, build, and survive harsh conditions, but they were not organized around linear factory-like productivity. Their energy expenditure followed nature, terrain, climate, availability, and opportunity.

The factory, however, needs something else: fast energy, inexpensive, easy to distribute, easy to recharge, compatible with mechanical repetition of movement and extended working hours. Carbohydrates fit this logic perfectly. They are not just food. They are a tool for standardizing the human body.

A Dietary, Economic, and Social Question

This is why we must ask the uncomfortable question. Have carbohydrates been massively promoted because they were the best fuel for human physiology, or because they were the best fuel to cheaply feed large populations destined to work long hours?

The current social divide already gives part of the answer. Lower classes live predominantly on the cheapest, most storable, most industrial calories: cereals, sugars, flours, pasta, processed foods. Conversely, quality animal foods remain more expensive and thus more selective. The poor receive the fuel of productivity. The privileged more easily buy the fuel of regulation.

And when healthcare costs explode, it is not necessarily nutritional insight that shifts mindsets, but because a system eventually questions whether carbohydrate-fueled production remains profitable when the metabolic, inflammatory, and medical bill becomes too heavy. The question is no longer just dietary. It becomes economic: how much does an overfed population on cheap energy yield, and how much does it cost later in chronic diseases?

Eating to Produce, or Eating to Stay Coherent?

The conclusion is therefore far more brutal than a simple carnivore versus carbohydrate debate. An 80-kilogram carnivore man can work far more than those who confuse energy with sugar imagine. What he tolerates less well, however, is the model demanding high cadence repetition, constant restarts, prolonged mechanical availability—in other words, a body calibrated for modern production.

Carbohydrates enabled this: not by making humans truly more powerful in absolute terms, but by making them more easily integrated into a system that needs them to endure, obey, repeat, and cost little to feed.

And if some recommendations are beginning to shift today, it may not be because biological truth has finally triumphed. It may be because the most cynical question has emerged: at what point does the fuel of productivity stop being profitable when it produces a metabolically sick population in return?

Each person must ask themselves whether they still want to eat to produce more, or to remain biologically coherent.

#Carnivore #Carbohydrates #Glycogen #Metabolism #Insulin #PhysicalWork #MetabolicFactory #MetabolicHealth #LowCarb #HumanPerformance