I watched a documentary on Netflix last week called Fat, Sick, and Nearly Dead about a man who went on a juicing fast for 60 days. Wasn't the most interesting hour and a half of my life, but it did inspire me to try it out. He lost something like 70 pounds, but it was more about the health improvements and getting off the medications he had been on. Of course, not falling back into your old habits when the fast is over is the really hard part.
I've been overweight all my life but recently was able to lose 40 pounds before my vacation in March (to visit my sufferer - first time in person) by walking almost everyday and cutting out the junk food, portion control, and just making smarter decisions. But since I got back I have struggled to get back on the wagon. I've maintained my weight loss but haven't yet been able to take off more.
Anyway, I bought a new juicer and am going to do my own version (probably not quite as strict) of the juicing fast starting on Monday, so I had been thinking about this same topic myself in regards to my sufferer. Of course, he will always have PTSD, but it sure does seem reasonable that healing/reversing other issues his body may have going on and detoxing in general certainly can't hurt!
Whether you believe we are here because of God or evolution, the Earth can take care of itself. If humans would just leave it alone, given time, it would erase all the damage we've caused. Using the same reasoning, the Earth provides everything we need, but again, we tamper with things like GMOs, pesticides, artificial flavors and dyes, antibiotics, etc. If we would leave things alone - eating naturally grown raw fruits and veggies and had a more balanced diet, I think everyone would benefit to some degree...and probably a high one at that.