Vatican has officially nixed 100% gluten-free communion wafers when celebrating Mass. This directive was originally issued on June 15th, but didn't become widely know until last week when it was reported on Vatican Radio.
For some reason, it is crucial that communion be served with a minimal amount of wheat -- as opposed to breads made from rice, potato, tapioca, or other flours.
This is a big deal for Catholics who live with celiac disease, which is a gastrointestinal immune disease. Celiac disease causes stomach pain, diarrhea, and weight loss when they consume each small amounts of gluten.