helen87402 Does cooking meat reset the use by date?
Yes it does. Cooking, provided it’s done thoroughly, kills any bacteria that have built up. But some new ones will get back in as soon as the food starts to cool. And those bacteria immediately start to “multiply like rabbits” again.
That’s different from freezing, which doesn’t kill bacteria but slows the rate at which they can grow. So, when you defrost something that’s been frozen, it will still have at least as many the bacteria as it had when you froze it.
As a quick summary: freezing only delays food expiry, it doesn’t kill any bacteria, nor does it completely prevent them from growing but they grow at a very much slower rate in the freezer. That’s why packaging always says to use on the day of defrosting. But thorough cooking does kill them, which means they start again as if they were new.