Hello Zaida,
Welcome to Kickas and glad you found the site. It is very helpful in battling AS from a learning standpoint and also for support if you feel you have no where to turn.
I hope you can find some answers to help you. In regards to your question posted to David... you can navigate this site from main page to learn regarding diet and/or visit the diet forum. There is also a site regarding the diet translated to Spanish if that helps you out by Pelo.
Here are some links to make it a bit quicker at first...
https://www.kickas.org/londondiet.shtml - Basics on diet in English
https://www.kickas.org/ubbthreads/postlist.php?Cat=0&Board=starch - Diet forum if you want to ask questions
http://www.izorrategi.org/ - Diet discussed in Spanish
Best to you Zaida, you are not alone in your fight. There is much to learn and learning about AS can only help.
Tim