Great to see someone dig into this and provide some science behind it all (and perhaps others have done the same, I just haven't made it a point to look around). And timely, too, I've made important changes in my diet recently and the productivity payoff is huge. In particular, I discovered green smoothies about 2 months ago, and man the change those things have made! I rarely go a day w/out one, and they provide hours of increased focus and energy.

I believe in them so much I put up a quick article about them. For those that may be interested (one my recipes is included):

http://freelancefactor.net/index.php?/page/articles.html/_/a...