If you click on where it says "disABILTIES" at the top of this page it will take you to the Index. One of the top items is the "disABILTIES FAQ" which will gives lots of useful information. Go to Post #3 and scroll down to dietary restrictions. You will get a lot of specific information and links.
Or, if you want an easier route to the FAQs, click on the link in my signature.