Across farms, storage facilities and kitchens, food moves through many systems before reaching our plates. It requires water, soil nutrients, energy and labour at each stage. The journey involves irrigation in the field, washing, milling in processing facilities, refrigeration and transport in distribution networks. These steps can be resource-intensive. When food does not get eaten, the loss is not only within the food itself. Losses also include resource inputs and the work invested long before the meal was prepared.
Research estimates that a single loaf of bread requires around 731 litres of water. That includes the water used on farms, the facilities that prepare food for public consumption and the energy systems that move food into households. This figure reflects irrigation for wheat fields, cleaning during milling, steam and electricity used in baking, as well as the indirect water embedded in power generation.
Similar patterns exist across fruit, vegetables and dairy because every product travels through production, handling and transport. These items are part of daily life, yet they depend on natural resources that are already under pressure. South Africa has catchment areas that face recurring drought, and rising fertiliser costs have strained small growers and agricultural sector in general.
Waste also places pressure on local governments. Organic waste forms a significant portion of landfill content in many South African cities. When it decomposes without oxygen, it produces methane, which contributes to heat-trapping emissions and reduces the lifespan of landfill sites. It is becoming increasingly important to manage these sites nearing 100% capacity by diverting as much organic waste as possible. This also eases financial strain on municipalities and ultimately benefits ratepayers with lower waste levies.
Composting offers a practical approach to retaining some value from food that cannot be eaten. While it does not reverse the embedded resource cost, it produces a regenerative resource that supports soil health. Compost improves soil structure and moisture retention, which is valuable in areas where soil is compacted or low in nutrients. It can reduce reliance on synthetic fertilisers, many of which are imported and sensitive to global price fluctuations. For community gardens, school food programmes and small producers, locally generated compost strengthens soil and reduces input costs.
There is also an important behavioural influence. When households and food facilities separate organic waste for composting, they become more aware of how food is produced, stored and consumed. This can encourage more careful meal planning and support food recovery efforts. Composting also creates a visible link between kitchen waste and growing spaces. It reinforces the idea that soil fertility does not sustain itself without care, and that food systems benefit when nutrients are returned to the ground.
Responsible food use begins with prevention and thoughtful consumption; however, composting forms a meaningful part of a broader approach to reducing waste. It supports soil, lowers pressure on landfills and encourages awareness of the effort and resources behind every meal. In a context where natural resources and public services face increased strain, simple restorative practices such as composting help build a culture that values food from its source all the way to the table.