Scotland's reputation for coronary and related diet-based diseases is a result of the wide consumption of fast food since the latter part of the 20th century. Fish and chip shops remain extremely popular, and indeed the battered and fried haggis supper remains a favourite. In the area around Edinburgh, the most popular condiment for chip shop meals is "salt and sauce", the sauce element consisting of brown sauce thinned with water and vinegar. However in Glasgow, and elsewhere, chippy sauce is unknown and ketchup or salt and vinegar are preferred, prompting light-hearted debate on the merits of the options among the cities' residents, who tend to find the alternative a baffling concept.