RE: Powdered food - the why and the how
I'm a big fan (and distributor) of Juice Plus, which is powdered fruits and vegetables. It's the whole food, like the examples you cite above, but what I like about it is that the sugar is removed. Obviously, this wouldn't let you use the powdered fruits as a carbohydrate, but because I have issues with hypoglycemia and I don't tolerate fructose well, I love being able to consume fruits without all that sugar. But the important part is, I don't believe in getting macro- or micronutrients from supplements. They need to be in whole foods (and yes, powdered whole food is fine). Taking micronutrients in isolation, though, isn't a good idea (like a vitamin pill) because it's lacking the enzymes and complementary nutrients that help us digest them.
There's no evidence that we need enzymes to absorb micronutrients such as the vitamins, EPA/DHA and CoQ10 etc.
We do of course need enzymes for digesting macronutrients in whole food in order to break it down properly - but that is precisely why we do NOT need those same enzymes for isolated micronutrients - there's nothing to break down except for the pill or capsule they come in. If you had pure Vitamin C in powder form for example, you'd absorb it really easily just by swallowing the powder (not recommended of course - VitC needs to be taken in divided doses or time release form if you don't want to go rushing to the toilet - but you get the idea).
One product that i've found is good for getting phytonutrients without the added carbs is this one from the life extension foundation (of which i'm a proud member):
http://www.lifeextension.com/vitamins-supplements/item01468/triple-action-cruciferous-vegetable-extract
If you have evidence that we need enzymes to absorb vitamins in isolation then of course i'd be happy to hear it, but all the evidence i've seen seems to indicate we only need enzymes for macronutrients.