What is the purpose of a 'use by' date on perishable food products?

The purpose of a 'use by' date on perishable food products is to inform consumers when the food should be consumed for safety. This date is critical for items that have a shorter shelf life, as consuming products past this date can pose health risks due to spoilage or bacterial growth. It is a guideline established by manufacturers based on the scientific analysis of the product's safety over time.

The 'use by' date is not simply about when the food should no longer be sold, as the product may still be safe to sell before that date, depending on local regulations. It is also not about optimal taste; while freshness can impact flavor, the primary focus of a 'use by' date is safety. Lastly, it does not indicate the date of packaging. Instead, it specifically relates to the food's safety for consumer consumption, making it essential for those handling and preparing food to be aware of these dates to prevent foodborne illness.