Hi Wally,
That is a very interesting theory you have and have wondered that myself. Things I was thinking might make a difference if the diet works or not are. The diet appears to work like magic for some and others it is less than amazing.
1. How long you have had untreated AS
2. What joints are affected?
3. What medication you have taken in the past and for how long?
4.What caused your AS to become active or more active. eg> surgery, hormones, trauma, gardia, etc.
5. How long you stayed on the diet and how strict you are with it.
6. Do you have food sensitivities that you are aware of?
I am sure there are many more ideas out there but I think you have asked a good question because maybe if the reasons could be identified it would help the people who the diet doesn't help.
There is no drug stronger than a good attitude.
