I am not MH's representative and I can't speak for him.
The sense that I get from reading his book is that the OJ fast makes little sense as an isolated protocol. It is something to be done after a colon cleanse, a parasite cleanse and liver flush. It is part of the process of going from acid to alkaline. Just drinking orange juice for a few days is not going to produce the astonishing results that MH talks about.
Learning how to eat, how to breathe fresh air, how to get enough sunlight, how to get safe drinking water and reduce stress are all part of the process he is talking about. Education is the cure not some quick gimmick.
But I don't speak for him, I just read his book. YOu could write to him if you have some urgent concern that you feel he can help you with. Otherwise he gives away his book for free and you could request it.