Hi Nicky,
I wish you and your son all the best in following the diet. As you alluded, the diet is actually quite beneficial for people who don't have a spondylarthropathy, as well as those suffering the cursed disease.
I found the diet difficult enough when I commenced in my late forties, but for your 13 year old there's a whole lot of other considerations, such as peer pressure, etc. I hope he'll have the strength of character to stick with it, and remember not to beat yourself up over minor indiscretions. Reducing pain or being pain free is the goal - and be prepared not to just go along with the status quo but rather go with your gut feelings, if you'll pardon the pun.
Regards David
