A lot of people keep their freezers stocked with this stuff. What could actually be dangerous in there? They should be healthier than fresh produce that's been traveling for a week from other countries, right?
Frozen vegetables and fruits are generally a safe option if you don't panic for no reason. The main thing you definitely shouldn't do is believe the myth that they contain some special harmful preservatives. With proper freezing, preservatives aren't needed at all - the low temperature itself freezes microbes and slows down decomposition. The risk of pathogen contamination is much lower than with fresh produce, which actually gets shipped for a week and manages to accumulate all sorts of microorganisms.
The real problems are more organizational. If vegetables and fruits were stored improperly at the factory before freezing or are thawed incorrectly at home (left on the counter instead of in the fridge), bacteria can multiply. Sometimes producers freeze produce that's not quite fresh anymore - but that's more a matter of quality than safety. And yeah, some vitamins are lost during thawing, though frozen produce actually has more nutrients to begin with than fresh produce after a long delivery.
Practically the only thing worth actually checking is the production date and package integrity. If the bag is torn or you see ice crystals with lumps in the freezer - that means the product thawed and refroze, which is a bad sign. But if you store it correctly and thaw it in the fridge rather than on the counter, frozen vegetables and fruits are a normal, even beneficial option.
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