Any producer breaching the order, signed by European Commission President Jose Manuel Barroso, faces being jailed for up to two years. It took the 21 scientists on the panel three years of analysis into the link between water and dehydration to come to their extraordinary conclusion.
The EU has a long history of passing bizarre regulations, the most infamous being 1995 rules setting out dimensions for fruit and vegetables which led to excessively curved bananas and ugly carrots being banned. And last year attempts to regulate the use of root vegetables in Cornish pasties sparked chaos.