When should I throw food away?

Are you creating food waste unnecessarily?


Ever wondered what is the difference between Best Before (BB) and Use By (UB) on food?

Are you confused?

Have you created food waste, unnecessarily?

Have you thrown food away because the BB date was up, or kept food beyond its UB date, because “the retailer always shortens it, don’t they!”

The difference between the two types of shelf life or durability code is that Best Before (BB) is all about quality, and Use By or UB is all about safety.

Which date is used for which type of food?

The types of food that have a UB are those which would support the growth of pathogens (disease causing micro-organisms). This would happen if their growth wasn’t controlled by temperature control or another type of food preservation, like drying or adding preservatives.   Examples are meat, dairy products, cooked meats, prepared vegetables and ready to eat products like sandwiches.

Products which carry a BB are being marked as the product as sold is unlikely to cause food poisoning if the packaging is undamaged. Often, there is a recommendation for a period to eat the food within on these packs, or a “Once Opened consume within” period of time. For example, canned fish is safe if the can is not opened for months and will carry a BB. Once opened, however, it needs to be treated as a fresh fish. It will carry a notice that reads something along the lines of -“If not consumed immediately, keep refrigerated and consume within a period of time”. There may also be advice regarding the type of storage container or conditions.

The statistics are mind blowing! The Courtauld Institute estimate that 7.1 million tonnes of foodwaste is created by households in the UK every year.

Urban Myths

Manufacturers of food have an obligation to conduct robust shelf life tests and keep records of these. It is also in the retailer and manufacturers’ interest to keep the food available for sale as long as possible. There is no “couple of extra days” available for the consumer past the UB date. I think that this is a legacy of the previous system of Sell By or Display Until and Use By dates. In the past, a retailer would remove food from sale at the Display Until or Sell By dates. The customer then had until the Use By date to eat it.

How do manufacturers check?

For example, for biscuits, the shelf life may include eating quality over a period of months with a microbiological test at the end. For a fresh ready meal, the shelf life test will include regular microbiological testing as well as eating quality or organoleptic testing.

So, in essence the UB date is a food safety date and food should not be eaten after this date. A Best Before date is for quality and most people don’t mind a biscuit which has become a tiny bit soft.

Don’t throw food away, just because the BB date is passed.

The Food Standards Agency (FSA) has a page of legislation about this

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