Well, all the "evidence" I need is how I feel after drinking a fresh raw juice or eating a meal from the raw food restaurant.

The only way I can describe it is "bright." Not in an intellectual sense, but just in terms of how it feels like every cell in my body is energized and cleaned.

Besides the up-front cost of a juicer, I think the biggest barrier for most people is just looking at, and affording, the volume of whole vegetables it takes to get a significant amount of calories. That ought to tell us all something right there. Very, very few of us get the amount of vegetables we need - including those of us who try to eat healthy and even paleo folks who eat meat and nuts daily rather than just a few times a week.