The barrel behind the basket: How fluctuations in crude oil supply and price travel through the food chain

When the price of diesel rises, the effect is easy to understand. Filling a car, van or lorry costs more. But for the food industry, the number at the petrol station is only the most visible part of a much bigger story.

Crude oil is refined into diesel, jet fuel and marine fuels. Refineries also produce feedstocks used by the petrochemical industry to manufacture plastics, chemicals and synthetic materials. Oil therefore reaches the food chain not only through the vehicles moving food, but through many of the products and processes that make that movement possible.

When crude oil supplies tighten or prices fluctuate sharply, the effects can travel from farms and factories to ports, packing sites, cold stores and distribution centres.

It starts before the harvest

Diesel powers much of the heavy machinery used in farming. It runs tractors that prepare and cultivate the land, equipment used to protect crops and machinery that brings in the harvest. Diesel generators may also provide temporary or backup power for irrigation, storage and other operations, particularly where farms are remote, or electricity supplies are vulnerable.

Once food leaves the field, diesel is needed again. Crops travel to farm stores, cooling facilities, packhouses and processing sites - often within tight timeframes.

Fresh food cannot simply wait for oil prices to settle. A crop must be harvested when it is ready. Fruit and vegetables must reach cooling, packing and distribution facilities while their quality can still be protected.

A small increase at the pump may look manageable to an individual driver. Across tractors, generators and commercial fleets consuming thousands of litres, it becomes a substantial operating cost.

Every stage brings another issue

Modern food supply chains involve repeated movement. Agricultural inputs must reach farms. Ingredients and packaging travel to factories. Finished products move through warehouses and distribution centres before reaching retailers, restaurants and consumers.

Each journey creates exposure to diesel prices. Food transport also has demands that ordinary haulage may not. Chilled and frozen products require temperature-controlled vehicles. Refrigeration units consume energy throughout the journey, while operators must meet strict delivery windows to preserve safety, quality and shelf life.

The challenge is not only the price of fuel. It is the speed at which it can change. A high but stable price can be included in budgets and contracts. A price that rises, falls and changes direction again makes transport rates, profit margins and investment decisions harder to predict.

By sea and through the air

The UK food sector is connected to growers, producers and manufacturers around the world. Most internationally traded food moves by sea. Container ships use marine fuel, while refrigerated containers also need power to maintain controlled temperatures throughout long journeys.

Marine fuel is not the same as road diesel, but both are petroleum products. Changes in crude oil costs can influence shipping expenses, although freight rates are also shaped by vessel capacity, demand, route disruption and port congestion.

Air freight is used more selectively, particularly for urgent, highly perishable or premium products. Aircraft use jet fuel rather than diesel, but conventional jet fuel is also produced through crude-oil refining. A product may travel by road to an overseas airport or port, cross the world by ship or aircraft and then return to the road network after entering Britain. Crude-oil exposure can appear at every stage.

Oil inside the packaging

The less obvious connection is packaging. Many of the plastics used throughout the food chain begin with petrochemical feedstocks derived from crude oil or natural gas. These materials can become trays, films, liners, labels, containers, protective coverings and components used in food-processing and packing machinery.

Recycled and bio-based materials are becoming more important, but conventional petrochemical feedstocks remain significant in the plastics market.

This does not mean the cost of a plastic tray rises automatically whenever crude oil moves. Polymer availability, manufacturing capacity, recycled content, labour, transport and commercial contracts all affect the price. But sustained oil-price increases or interruptions to petrochemical supply can add pressure to packaging and component costs.

Petroleum-derived materials also appear in lubricants, synthetic rubber and chemicals used across machinery, vehicles and industrial operations. Their presence is often less visible than the diesel in the tank, but they remain part of the operating cost of keeping food production moving.

Why the shelf price does not move immediately

A rise in crude oil does not produce an identical rise in food prices the following morning. Businesses may have fixed fuel agreements, freight contracts, existing packaging stocks or longer-term purchasing arrangements. Growers, manufacturers and logistics operators will usually search for efficiencies before attempting to recover higher costs.

They may improve vehicle utilisation, consolidate shipments, reduce empty mileage or absorb lower margins temporarily. These actions delay and soften the impact, but they cannot always eliminate it.

If oil costs remain high, the pressure may eventually appear in reduced investment, supplier strain, changed sourcing decisions or higher prices. The effect is normally gradual and distributed across several stages of the chain.

Seeing what sits behind the price

At MWW, our work across growing, international sourcing, ripening, packing, storage and distribution gives us a practical view of how these costs connect.

We cannot control the global supply or price of crude oil. We can control how intelligently we use the resources affected by it. That means planning fuller loads, reducing wasted journeys, improving container and vehicle utilisation, maintaining efficient equipment and working closely with growers, suppliers and customers.

It also means reducing food waste. Every product lost carries not only the value of the food, but the fuel, packaging, labour and transport already invested in it.

The diesel board is the part everyone sees. Behind it sits a barrel of crude oil whose influence can extend through farms, aircraft, ships, packaging plants, warehouses and refrigerated vehicles.

When the price of that barrel moves, the effect does not stop at the pump. It travels through the food chain.