The Protein Blocks and the Grey Cubes (*Snowpiercer*, Bong Joon-ho, 2013)

What it is

Snowpiercer's food system is a class system in wafer form. The 2013 South Korean-Czech film (directed by Bong Joon-ho, based on Jean-Marc Rochette and Jacques Lob's 1982 French graphic novel Le Transperceneige) is set aboard a single perpetually moving train — the Snowpiercer — that has been carrying the last survivors of human civilization for seventeen years after a catastrophic climate engineering attempt froze the Earth. The train is a closed ecological system. Whatever is on the train is all there is. And what people eat on the train is determined, with brutal precision, by where on the train they live.

At the front: real food. Sushi. Protein blocks of clearly identifiable contents. Vegetables from the train's on-board greenhouse cars. A restaurant car serving haute cuisine. Wine. Aquarium cars full of fish. The full luxurious expression of what food can be.

At the tail: grey protein cubes. Dense, uniform, slightly gelatinous rectangles distributed in fixed rations. They have no apparent flavor, no apparent texture beyond basic edibility, no apparent connection to any food tradition or pleasure. They keep people alive. That is their only claim.

The revelation — arriving two-thirds of the way through the film, in one of the most viscerally effective reveals in recent science fiction cinema — is that the grey protein cubes are made of cockroaches.

The source work

Snowpiercer (2013), directed by Bong Joon-ho. Screenplay by Bong Joon-ho and Kelly Masterson. Based on Le Transperceneige (1982) by Jacques Lob and Jean-Marc Rochette (with later volumes by Benjamin Legrand). The food system of the film diverges significantly from the graphic novel, which Bong deepened and rendered more specific in its class commentary.

How it's described

The tail section food distribution is established early and efficiently: a guard moves down the aisle, and tailies hold out their hands. A grey slab is placed on each palm. That is a meal. No choice, no variation, no ceremony, no flavor, no pleasure. Just input.

The protein cube scenes are presented with a clinical flatness that makes the class contrast with the front cars even more devastating. When Curtis (Chris Evans) and the tail-section revolutionaries fight their way through the train toward the engine, each new car they enter is more lavishly provisioned than the last. The greenhouse car. The aquarium. The restaurant. The sushi bar. The food of the front of the train is not just better food — it is the entire concept of food as culture, pleasure, and choice, from which the tail-section people have been systematically excluded for seventeen years.

The cockroach revelation arrives in the Snowpiercer's protein factory car. The industrialist Wilford's associate Gilliam (John Hurt) and the train's designer have arranged the system so that the tail section's grey cubes are mass-produced from cockroach paste processed through industrial machinery. The camera lingers on the machinery. The grey bricks emerge from it in continuous production. The guards who bring tail-section meals have always known. The tail-section people have not.

The Cockroach Detail: The Horror That's Actually Correct

Here is where Snowpiercer makes a more interesting argument than Soylent Green, and it is an argument that the film's horror framing partially obscures:

Cockroaches are genuinely excellent food.

Nutritional profile: Cockroaches (Blattodea family, several species) contain between 65-75% protein by dry weight, with a complete amino acid profile. They contain significant quantities of B vitamins, iron, zinc, and calcium. Their fat content is lower than most vertebrate meats. From a pure nutritional standpoint, cockroach protein is competitive with chicken and superior to several conventional protein sources.

Sustainability profile: Cockroaches require minimal space, water, and feed relative to their protein output. They will eat almost any organic waste. They produce negligible greenhouse gases compared to ruminant livestock. They reproduce rapidly and require no antibiotic treatment. If the question is "what is the most efficient protein source for a closed system with limited resources," cockroach — or insect protein more broadly — is a genuinely strong answer.

The real food technology context: By 2013, when the film was released, insect protein was already being seriously investigated by food scientists and sustainability researchers. The UN FAO had published studies on edible insects as a sustainable protein source. Companies producing cricket flour, mealworm pasta, and black soldier fly protein meal were beginning to emerge in Europe and Asia. By 2026, insect-based protein products are commercially available across most of the developed world and are an established part of the food-tech industry's sustainability toolkit.

The grey protein cubes of Snowpiercer's tail section are, in principle, a nutritionally sound food made from a genuinely sustainable source. The horror of them — and this is the film's most intelligent move — is entirely class-based. The grey cubes are horrifying not because they are unhealthy or because their ingredient is inherently disgusting (cultures around the world eat insects as a normal and valued food, and have for millennia) but because:

1. The people eating them did not choose them 2. The people eating them were deceived about their contents 3. The people at the front of the train are eating something better, and the grey cube is the material sign of your place in the hierarchy 4. The decision to feed cockroaches to the tail section while serving sushi in the restaurant car is a deliberate political choice, not a survival necessity

The film's food argument is therefore not "cockroaches are disgusting" (they're not, really) but "the withholding of choice and dignity in food is itself a form of violence." The tail-section people are not being poisoned. They are being told, every meal, that they do not deserve to know what they are eating, do not deserve to choose what they eat, and do not deserve to eat what the people who made the decisions about them are eating.

The Train as Capitalism

Bong Joon-ho has been explicit in interviews that the Snowpiercer train is a metaphor for capitalism's class structure. The train's physical layout — with visible, literal movement required to progress from the lower economic sections to the upper ones, with security forces maintaining the boundary between sections, with the engine's owner presented as a god-figure whose continued good will is the price of survival — is the clearest possible physical representation of economic stratification. You cannot leave the train. The system is the world. You accept your section or you die.

The food system is the most efficient vehicle for making this argument felt rather than merely understood. Abstract discussions of class dynamics can be intellectually processed and emotionally neutralized. A scene where a man who has been eating grey blocks for seventeen years first tastes a steak is not abstract. The look on Curtis's face in the restaurant car — a mixture of pleasure and fury and grief — is a kind of political argument that no amount of Gini coefficient discussion can replicate.

The grey protein cube also makes an argument about processed food and industrial food systems that is specific to the contemporary moment: the further food is processed from recognizable ingredients, the more it becomes a vehicle for the values and priorities of the people who process it rather than the people who eat it. A bowl of rice tells you something about where it was grown, who cultivated it, what soil it came from. A grey protein cube tells you nothing. It has been thoroughly de-informed. It contains exactly the information its producers want it to contain, which is: this is sufficient calories. Eat it and be quiet.

The Graphic Novel Origins

Jacques Lob and Jean-Marc Rochette's Le Transperceneige (1982) originated the train conceit but did not develop the food system with the same specificity as Bong's film. The graphic novel's food revelation is less viscerally focused and more diffused across a broader class critique. Bong's film version concentrated the class argument into the food system in a way that made it more immediate and more universally comprehensible — food is something everyone understands, and the gap between the tail-section grey cube and the front-car sushi bar is visible and interpretable by an audience with no prior knowledge of the graphic novel or its political tradition.

The 2020 Netflix television series Snowpiercer (three seasons, with Jennifer Connelly and Daveed Diggs) further developed the food system's class dynamics, dedicating more screen time to the greenhouse cars and aquarium cars and their role as contested resources within the train's political economy.

Real-world attempts

The grey protein cube has inspired no specific real-world replication attempts (the appeal being limited), but the cockroach revelation has become a touchstone reference in discussions of insect protein adoption:

Cricket flour: Several companies now produce cricket flour as a high-protein, low-impact alternative to conventional flour. Cricket flour is approximately 60% protein, has a mild nutty flavor, and can be substituted partially for wheat flour in baking. Companies like Bitty Foods (US), Entomo Farms (Canada), and numerous European and Asian producers have built commercial businesses around it.

Mealworm protein: The larvae of Tenebrio molitor (the yellow mealworm) were approved as a Novel Food by the EU in 2021. Mealworm protein is nutritionally comparable to conventional animal protein and requires significantly less land, water, and feed per kilogram of protein output. Several EU food companies now incorporate mealworm protein into products ranging from pasta to protein bars.

Black soldier fly: The larvae of Hermetia illucens are perhaps the most sustainable of all insect protein sources — they can be raised on food waste, produce negligible greenhouse gases, and have a protein content of 40-50%. Black soldier fly meal is currently used primarily as an animal feed ingredient but is being developed for direct human consumption.

The cultural barrier to insect consumption in Western markets is real and is, essentially, the Snowpiercer problem in reverse: people who have grown up eating vertebrate animals process insect eating as a degradation, a retreat to a more primitive or desperate form of eating, even when the nutritional and environmental arguments favor insects. The grey cube horror is instructive here: the disgust is cultural, not biological, but cultural disgust is not less real for being arbitrary.

Cultural legacy

Snowpiercer's food scenes have become reference points in food policy discussions about protein sustainability, insect consumption, and the ethics of food system transparency. The film has been cited in academic papers on food justice, on the politics of food choice, and on the relationship between class and diet.

The cockroach reveal, in particular, has been used in food journalism to illustrate the distinction between objective nutritional value and subjective cultural acceptability — the grey cube is, by any nutritional metric, a perfectly adequate food. The horror of it is entirely about context, information asymmetry, and the class contempt that the concealment represents.

Reference notes

• Edible insects / cricket flour — the real-world version of the cockroach protein cube; Cuisinopedia entry on insect protein as a sustainable food source
• Sushi (and individual fish entries) — the explicit front-car luxury food of Snowpiercer; connects to the class politics of raw fish consumption globally
• Protein and nutrition — the film's grey cube is nutritionally coherent; connects to entries on protein sources across cultures
• Fermented foods and preservation — a closed system like the train would require sophisticated food preservation; connects to the fermented foods section of the Cuisinopedia
• Food justice — the broader political context of Snowpiercer's food argument; connects to any Cuisinopedia entries addressing food access and equity

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