More is decided before freezing than many process plans reveal

Freezing does not reverse microbiological processes. This seemingly simple point lies behind an assessment published by the European Food Safety Authority on 27 January 2026. EFSA examined how bacteria develop on meat from cattle, sheep and pigs during chilling, storage, freezing, defrosting and subsequent holding. The work considered pathogens such as Salmonella and Listeria as well as microorganisms that impair aroma, appearance and shelf life.

The period before the product reaches the freezing point is central. Temperature, time and packaging determine the microbiological condition in which meat enters frozen storage. Vacuum packaging can alter the growth of certain organisms, but it replaces neither temperature control nor time control. EFSA compared different process scenarios with a reference case: meat stored unpackaged at 7°C for 15 days. Mathematical models were used to calculate an “equivalence time”—the point at which another scenario reaches a comparable microbial level.

For practice, this is more useful than a single universal maximum period. Two products may look similar on the day of freezing while carrying very different process histories. A business that records only the freezing date and shelf-life date may overlook the decisive information: temperature profile, previous storage period, packaging condition and intended defrosting method.