Perhaps you should look at it another way. Instead of asking how much of something good you should eat, perhaps you should ask yourself how little of everything else you should have. If you cut out or at least minimize the bad, processed carbs, sugars, and saturated fats, then how much of the good stuff will you have to eat to feel sated? I think the idea is to eat a variety of vegetables and fruit and not get too formulaic about it. And I'd leave the powders to the get-thin-quick crowd, who tend to flame out anyway.