MLR - I Completely endorse what Kellybells says, the diet *works. Just check out the diet forum PLUS ALL the success stories (upper case is for doubting-Thomas-Frederick).
I hauled in my own inflammatory problems by following the diet. I did the LSD / low starch protocol. Worked. Do fall by the wayside every now and again, Ho-Hum, up pops the inflammation (usually the spine, of course) then back to the discipline, when all is well again.
As for the rheumy declaring that unless being poisoned with toxic your son would go blind...needs a thorough trouncing. Following 'directives' and no doubt with the help of having his back-pocket stuffed to boot !
Best to your son MLR, he has guts, and is very much on the winning side.
Take care -
MollyC1i - Keeping on, Keeping on, innit