http://health.ninemsn.com.au/article.aspx?id=1 54807
Conclusion
While it was neck-and-neck in our vegies test, with frozen winning out when it came to Vitamin C, overall fresh produce had the more nutrients. When it comes to fresh vegies, your best bet is consuming them as soon as possible after they're harvested. If you can't eat them that quickly, frozen becomes a good option.
In regards to Andrew's frozen steak, the fresh meat it was compared to had similar levels of protein and magnesium, but the three-year-old frozen steak had 20 percent more iron.
"It could be because it came from a different cut of meat; different cuts of meat have different iron contents," says Dr Skurry. "Freezing preserves the iron � there's nothing that can really happen during freezing with the iron content, and that goes for all the minerals."
That said, Dr Skurry would not eat the three year old steak. After that long, the fat can break down and become toxic.
"You definitely wouldn't want to be eating anything that's been in the freezer for more than 12 months," he says.