Ilya Erich Mecinikov, a Russian biologist, concluded that Bulgarians' longevity was due to their long-term habit of eating cheese. Mechnikov pointed out that lactic acid bacteria is an important element for human health, so he began to promote cheese as a food all over Europe. Later, a Spanish entrepreneur, Isaac carazo, industrialized the production of cheese. In 19 19, carazo promoted his cheese products in Barcelona, and named the goods after his son Dannon, which is more familiar in the United States. There is a saying that cheese with jam pulp can exert its protective effect against virus invasion. This kind of cheese with jam pulp was finally patented by a dairy company in Prague in 1933, and was introduced to the United States by Danone in 1947.