As a Celiac this book prompted me to think more seriously about greens, and digestive health on the whole. It was an interesting concept that set me on the road of experimentation.
I tried his Perfect Food supplement - beware that the author uses his Chrone disease personal experience to market a canned buffet of different, expensive, powdered health remedies... The Perfect Food uses wheat, oat and rye grasses which are supposedly gluten-free, a scary concept for my intestines, along the standard "green" supplements, and probiotics, and it basically de-toxed me for three weeks. I mix it in OJ. I released a ton of crap (literally), thirst for water (good), am less hungry and I released 4 lbs in the process. I feel tired and can't tell if it is a possible Celiac response or just my life. Everyone notices a difference in the way I look, and now I crave the drink. Placebo? Perhaps. It makes my super-sensitive-celiac son very sick - I don't think it is totally gluten free.
Good read for the concept.