In many cultures, traditional and modern, there are strong links between food and superstition or magic. Some foods bring good luck, others carry bad luck along with them. Some can be used to entrance a lover, or others can send one on his or her way.
This symbolic connection between food and superstition is very strong in Brazil. It is an important part of the rituals of the Afro-Brazilian religion Candomblé, as it is in the celebrations of the Christian churches. Carnaval has its culinary associations, and so do the important religious holidays like Christmas and Easter.
Because swine use their snouts to root forward in the soil, eating pork is considered lucky by Brazilians, and supposedly ensures that one's pantry will remain full in the New Year. Turkey and crab are unlucky at this time of year, and should be avoided.