Milk stout(also calledsweet stoutorcream stout) is a stout containinglactose, asugarderived frommilk. Because lactose cannot be fermented bybeer yeast, it adds sweetness and body to the finished beer. Milk stout was claimed to be nutritious, and was given to nursing mothers,along with other stouts.Milk stout was also said to be prescribed by doctors to help nursing mothers increase their milk production.The classic surviving example of milk stout isMackeson's,for which the original brewers advertised that "each pint contains the energisingcarbohydratesof 10 ounces [280 ml] of pure dairy milk". The style was rare until being revived by a number ofcraft breweriesduring the craft beer boom of the twenty-first century.
It is widely reported that, in the period just after the Second World War whenrationingwas in place, the British government required brewers to remove the word "milk" from labels and adverts, and any imagery associated with milk.However, no specific legislation or orders have been found to support this, though there were some prosecutions inNewcastle upon Tynein 1944 under the Food and Drugs Act 1938 regarding misleading labelling.