Beer in England ale, which was now seen as an endangered style. English drinkers became more interested in imported beers during the 1970s and 1980s, partly as a result of increased foreign travel, and partly because of promotion of the subject by beer writers such as Michael Jackson, with his 1977 "The World Guide to Beer". Newly popular foreign brands included Beck's from Germany, Heineken and Grolsch from the Netherlands, Leffe and Hoegaarden from Belgium, Peroni from Italy, San Miguel from the Philippines, Budweiser and Sierra Nevada from the US, and Corona Extra from Mexico. A number of bars specialise in imported beer,
Beer in Germany used in the production of beer were water, barley, and hops, which had to be added only while the wort was boiling. After its discovery, yeast became the fourth legal ingredient. (For top fermenting beers, the use of sugar is also permitted.) There is a dispute as to where the "Reinheitsgebot" originated. Some Bavarians point out that the law originated in the city of Ingolstadt in the duchy of Bavaria on 23 April 1516, although first put forward in 1487, concerning standards for the sale and composition of beer. Thuringians point to a document which states the ingredients of beer