I haven't tried this particular diet, but I have found that I function best on a vegetarian/raw diet. I usually try to do 51% raw (fresh fruits, veggies, nuts, grains, etc). Honestly, I haven't really noticed a difference in reference to my IIH symptoms. I definitely feel healthier in general, which makes it easier to handle IIH. I've learned that processed foods and dyes are the devil, at least in my case. I do think it's important to remember that every one is different, so it's definitely a process of trial and error.
There have been a lot of studies regarding Vitamin A. IHRF actually provided funding for the Grzybowski-Katz Project that had interesting results (http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=2&cad=rja&uact=8&ved=0CCcQFjABahUKEwjQ_b2Pl5XHAhXDGD4KHToVCKE&url=http%3A%2F%2Fcsf-regulation-research.org.ohio-state.edu%2Fhavener%2FGrzybowski_Deborah_Resume_Asst_Prof.pdf&ei=CrTDVdDQB8Ox-AG6qqCICg&usg=AFQjCNFOTOqzFcLAhieHGdcPJky30O1hHA).
I agree with Linda..talk to your physician and choose a program that supports your overall health.