Food products are manufactured in large volumes these days. The mass production of foodstuffs means that millions of products are produced and transported in bulk consignments. This makes the individual checking and handling of each product impossible. Yet there are instances where a defective product is manufactured or the food starts to become a hazard to the consumer's health. In such cases, the manufacturer needs to be able to track the product, and they can use food traceability software systems to do this.

There are different reasons why food needs to be tracked down or monitored. The first is that the food eventually passes its expiry date and is no longer legally allowed to be sold. This is not always a matter of health; some food is not decomposed or even unfit for human consumption. However, the mere fact that its legislated expiry date has passed means that it cannot be sold to the public. This sounds like a purely bureaucratic consideration but the legislation exists and stores cannot bypass it.

But the other reason is more serious. One would expect this to be limited to the perishable products like fresh fruit and vegetables and dairy, but even tinned foods and long-storage cereals suffer from the issue of decomposition. Once this has set in, the product is genuinely useless and cannot be consumed, let alone sold.

The software systems are used to tag and record each batch of products. The manufacturer can then track the batch and monitor its movement, so that they can locate it and eliminate it from the market if they need to.

On their own side, the public can also take measures to protect themselves from expired or unhealthy products. The tracing system is not infallible, and products might not be accurately tagged. The expiry date on a product might not be correct, and this might not even be by accident. The date may not have been accurate to start with, or it might have been updated later to prolong the shelf presence of the item.

Canned goods are especially easy to check by the consumer because the metal changes shape as the product goes off. If the can is inflated, the contents are rotting, which may also mean that air has entered into the can. If the can is at all dented, punctured or rusted then it should not be purchased.

Some products are specifically marketed as long-life or long-term. But this does not mean that they never expire. The temptation for retailers is to stock them for a long time, so that even after one or two years they still have not past their expiry date. But they may yet be expired. If the retailer refuses to remove them from the shelves, the consumer has the right to contact the authorities or the manufacturer.

The flavor or quality of the product is not the only consideration when it comes to expired food products. Public health is important and expired foodstuffs can cause disease and death. These products should be detected and removed from the market as a matter of course.