I have heard (dont know how true) but if you COVER them in water and cook them for a long time, THEN you zap all nutrients, but if you just put a little water and cook for a short time, it is fine, because it is just steaming them and not boiling them...
maybe someone with more knowledge can chime in lol
I am bad about buying the steamfresh veggies when they are $1 a bag...i LOVE the asparagus blend...