The Vatican has outlawed the use of gluten-free bread for Holy Communion. The ruling must be followed by 1.2 billion Catholics around the world wheat intolerant worshipers will be disappointed to hear.

At the request of Pope Francis the announcement was made in a letter to bishops by Cardinal Robert Sarah, prefect of the Congregation for Divine Worship and the Sacraments.

“It is for the Bishop as principal dispenser of the mysteries of God, moderator, promoter and guardian of the liturgical life in the Church entrusted to his care to watch over the quality of the bread and wine to be used at the Eucharist,” Cardinal Sarah wrote.

Roman Catholics believe that the bread and wine served at the Eucharist are converted into the body and blood of Christ through a process called transubstantiation

The Cardinal added that bread “must be unleavened, purely of wheat, and recently made so that there is no danger of decomposition.”

However, low-gluten bread with enough protein in the wheat to make it without additives will be allowed.

Roman Catholics believe that the bread and wine served at the Eucharist are converted into the body and blood of Christ through a process called transubstantiation. The belief commemorates Christ’s sacrifice of himself on the cross.

According to the new ruling, bread if made from or even mixed with a substance other than wheat “does not constitute valid matter for confecting the Sacrifice and the Eucharistic Sacrament.”

The Cardinal wrote that the ruling was needed as a result of Eucharistic bread now being bought from supermarkets and “even over the Internet,” rather than only being made by people in the religious community.

“It is a grave abuse to introduce other substances, such as fruit or sugar or honey, into the bread,” the Cardinal stipulated.

The validity of bakers also came into question with the Cardinal stating that bread should be made by people “distinguished by their integrity”, according to the letter issued last month.

Ancient articles of faith: Catholic antiquities Show all 7 1 /7 Ancient articles of faith: Catholic antiquities Ancient articles of faith: Catholic antiquities Reliquary pendant from the Holy Thorn (c.1340) Ancient articles of faith: Catholic antiquities Altarpiece reliquary painted by Lippo Vanni (c.1350-1359) © The Walters Art Museum Baltimore Ancient articles of faith: Catholic antiquities Reliquary bust of an unknown female saint (c.1520-1530) © The Metropolitan Museum of Art, New York Ancient articles of faith: Catholic antiquities Reliquary statue for the umbilical cord of Christ (1407) © Musée National du Moyen Ages - Thermes de Cluny, Paris Ancient articles of faith: Catholic antiquities Holy Thorn reliquary of Jean, Duc de Berry, Paris (pre 1397) © The Trustees of the British Museum Ancient articles of faith: Catholic antiquities Arm reliquary of the Apostles (c.1190) © The Cleveland Museum of Art Ancient articles of faith: Catholic antiquities Gold, silver, silver-gilt and enamel reliquary pendant of St Demetrios with St George Byzantine (c.12th / 13th Century)

Other specifications included that the wine must not be “soured” and can only be “natural, from the fruit of the grape, pure and incorrupt, not mixed with other substances.”

“It is altogether forbidden to use wine of doubtful authenticity or provenance,” he added.

Australian celiac Eryn Isaac, a youth minister at St. Paul’s Catholic Church in Calgary, told CBC News: “I think that's why the Catholic Church has stood as long as it has.”