Food Miles, Diet Change, and What You Actually Eat

🥗 Food Miles, Diet Change, and What You Actually Eat

For most UK students, food security feels like something that happens elsewhere. But the choices made in British supermarkets and kitchens connect directly to global food and resource systems — and your exam paper may well ask about them.

Food Miles

Food miles measure the distance food travels from producer to consumer. The UK imports roughly 40% of its food, with products arriving from over 100 countries. Critics argue that long-distance food transport generates unnecessary CO₂ emissions and should be replaced by locally grown food. But the reality is more complicated.

A study comparing Spanish tomatoes grown in heated greenhouses (to produce out of season in northern Europe) against Kenyan tomatoes grown in natural sunlight and flown to Britain found that the Spanish tomatoes had a higher carbon footprint despite travelling far less distance — the energy used to heat and light the greenhouse outweighed the emissions from the flight. Food miles are a crude measure; what matters is the total carbon footprint of the entire production system, not just the transport stage.

The Meat Problem

Livestock farming is one of the most resource-intensive ways to produce food:

• Livestock use approximately 80% of all global agricultural land but provide only about 20% of global protein — an extraordinarily inefficient conversion of land to nutrition
• Producing 1 kg of beef requires roughly 15,000 litres of water and produces about 27 kg of CO₂ equivalent — compared to 1,600 litres and 0.9 kg CO₂ for 1 kg of lentils
• Beef uses roughly 20 times more land per gram of protein than lentils, beans, or peas
• As incomes rise in China, India, and Brazil, per-capita meat consumption is increasing rapidly — the global livestock sector is growing even as evidence of its environmental impact accumulates

A shift toward plant-based diets in wealthy countries would free up enormous amounts of land, water, and energy — resources that could either reduce agricultural pressure on ecosystems or produce more food for growing populations. But dietary change requires shifting cultural norms, economic incentives, and food systems that have been built around meat production for generations. It is a geographical issue as much as a personal one.

Food Waste

Approximately one-third of all food produced globally is lost or wasted — around 1.3 billion tonnes per year. But the type of waste differs by development level:

• In HICs, most waste occurs at the consumer end — households throwing away food, supermarkets rejecting produce for aesthetic reasons, restaurants over-ordering. The average British household throws away £800 of food annually.
• In LICs, most waste occurs earlier — at harvest and storage. Lacking refrigeration, pest-proof storage, and roads to market, farmers may lose 30–40% of their crop before it ever reaches a consumer. Improving post-harvest storage in sub-Saharan Africa and South Asia could increase effective food supply dramatically without growing a single additional crop.