(BBC News) Bread used to celebrate the Eucharist during Roman Catholic masses must not be gluten-free - although it may be made from genetically modified organisms, the Vatican has ruled.
In a letter to bishops, Cardinal Robert Sarah said the bread can be low-gluten.
But he said there must be enough protein in the wheat to make it without additives.
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The new rules are needed because the bread is now sold in supermarkets and on the internet, the cardinal said.