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"There is another misperception about frozen food, though it's one the experts are almost reluctant to talk about.

It's that rule about not refreezing things. Turns out it's not entirely true.

If something is frozen and thawed, it can be refrozen – as long as it was defrosted safely. So if you started to defrost a roast in the fridge and then realized you didn't need it, you could put it back in the freezer.

That would not be advisable for something that was thawed outside a fridge, the experts say. And they warn that the damage to taste and texture that comes from freezing would be exacerbated by refreezing.

So does this mean that if the power goes out you really don't have to throw out everything in the freezer? Holley suggests it really depends on how long the power was off, how warm it got in the freezer – and how certain you are that you know the answers to those questions.

"But generally speaking if you have a very good idea how long the freezer's been off and that the temperature has not gone above 4 C, most foods will still be safe – depending upon, of course, how long they've been at 4 C," he says.

"So you'd have to have a very good idea the period of time the unit was down.""