Naturopaths termed wheatgrass as “Green Blood” as there is a lot of molecular structural similarities between haem (found in hemoglobin) and chlorophyll, found in wheatgrass.
Wheatgrass juice is immediately absorbed into the blood stream and gives immediate energy. On an empty stomach, it is assimilated into the blood in about 20 minutes. The energy lasts throughout the day. It is practically the fountain of youth and was found to have numerous health benefits.
One sq feet of grass yields about 35 ml of juice.
(see attached picture of what I started growing at home - am into the second week)
The residual wad can be chewed to extract the last drop so that there is no waste.
For more details see
http://www.ewellnessrx.com/Articles/thewonders.pdf