Carbonara by troops from the United States. It was included in Elizabeth David's "Italian Food", an English-language cookbook published in Great Britain in 1954. Carbonara Carbonara () is an Italian pasta dish from Rome made with egg, hard cheese, guanciale (or pancetta), and pepper. The recipe is not fixed by a specific type of hard cheese or pasta. The cheese is usually Pecorino Romano. Spaghetti is the usual pasta, however, fettuccine, rigatoni, linguine, or bucatini are also used. Either guanciale or pancetta can be used. Another common substitute outside Italy is lardons of smoked bacon. The dish was created in the
Blood type diet "wrong" diet. The underlying hypothesis of blood type diets is that people with different blood types digest lectins differently, and that if people eat food that is not compatible with their blood type, they will experience many health problems. On the other hand, if a person eats food that is compatible, they will be healthier. That hypothesis is, in turn, based on an assumption that each blood type represents a different evolutionary heritage. "Based on the ‘Blood-Type’ diet theory, group O is considered the ancestral blood group in humans so their optimal diet should resemble the high animal protein diets