Original
Anti-inflammatory diet. There are a lot of info on-line.
Low to no starch-gluten-sugar diet is proving to be useful for quite a few AS patients (less inflammation, less pain). Get rid of processed foods first! This is a must!
Useful guidelines for AS diet(s):
https://www.thepaleomom.com/start-here/the-autoimmune-protocol/
http://paleozonenutrition.com/2011/02/12/auto-immune-disease-hla-b27-pain-free-on-no-starch-paleo-diet/
https://chriskresser.com/hla-b27-and-autoimmune-disease-is-a-low-starch-diet-the-solution/
https://thepositivepear.com/tag/low-starch-diet-for-ankylosing-spondylitis/