A celebrity chef is a kitchen chef who has become a celebrity. Today, chefs often become celebrities by presenting cookery advice and demonstrations, usually through the media of television and radio, or in printed publications. While television is ultimately the primary way for a chef to become a celebrity, some have achieved this through success in the kitchen, cook book publications, and achieving awards such as Michelin stars, while others are home cooks who won competitions. Celebrity chefs can also influence cuisines across countries, with foreign cuisines being introduced in their natural forms for the first time due to the work of the chef to inform their viewers. Sales of certain foodstuffs can also be enhanced, such as when Delia Smith caused the sale of white eggs across the UK to increase by 10% in what has since been termed the "Delia effect". Endorsements are also to be expected from a celebrity chef, such as Ken Hom's range of bestselling woks in Europe, but can also lead to criticism over which endorsements are chosen such as when Marco Pierre White teamed up with Bernard Matthews Farms, or when Darren Simpson advised and endorsed fast-food restaurant KFC. In South Korea, a celebrity chef is referred as a Cheftainer. History Cooks rising to prominence date at least as far back as the Roman Empire. The Roman historian Livy dated the advent of Rome's decline with the cook's "rise above his station". "And it was then," he wrote, "that the cook, who had formerly the status of the lowest kind of slave, first acquired prestige, and what had once been servitude came to be thought of as an art." He was not alone in this belief: Roman sumptuary laws were passed to curb what was seen as a culture of excess. The earliest chef to be credited with being a celebrity was the 16th century Italian, Bartolomeo Scappi. He was the personal chef to Pope Pius V, and is credited with writing the first cookbook, Opera Dell'arte del Cucinare in 1577. The 19th-century French chef Marie-Antoine Carême has also since been referred to as a celebrity of his era, due to the complexity of his recipes. The first chef to achieve widespread fame and celebrity status was Alexis Soyer. Born in France, Soyer became the most celebrated cook in early Victorian England. In 1837, he became chef de cuisine at the Reform Club