Frozen foods versus fresh?

Frozen vegetables are equally as nutritious as fresh, in some cases more so because they have been picked and frozen at the very best time. The only thing I wouldn't be so sure of is onstant potato. If you mean something like Smash (a dried powder you add water to to make mashed potato) then that is not good and doesn't even taste that nice I don't think. Having said all of this - supermarkets sell packs of mixed veg already prepared so cooking them is just as easy as frozen veg so why not give them a go if you are worried about the nutrition value of frozen veg.