One common denominator that researchers have found in fully 95% of people with diseases is a non-nutritious diet.

We've all heard it a million times, but just because it has become a cliché doesn't mean it isn't still true: in the long run, we really are what we eat. And, believe it or not, the road to disease can be altered and incubation cycles disrupted simply by consuming living foods (uncooked, non-pasteurized, minimally processed, live-enzyme containing fruits, vegetables, nuts, and seeds) and green foods. In fact, green foods alone have the capability of reversing the trend toward disease.
So, what are green foods? They're that stuff we baby boomers have been hearing about since we were little kids: deep green leafy vegetables. Not vitamins or medicines, just deep green leafy vegetables. Grandma knew what she was talking about when she told us to eat our spinach so we could grow up to be strong like Popeye. The power of the nutrients in deep green leafy vegetables to heal and rejuvenate a body is unmatched by any combination of synthetic medicines or supplements.

http://ahha.org/articles.asp?Id=26