Cake is the most common food for people to celebrate birthdays. It originated from the West. Before cake was introduced into China, the food we used to celebrate birthdays was usually longevity noodles, eggs or longevity peaches and so on, which is also a kind of good wishes for birthdays.However, the early birthday cake has a strong religious color, but people believe that on the day of the birthday, its soul is most likely to be invaded by demons, so on the day of the birthday, you need close relatives and friends to give you blessings, and send cakes to the birthday person, so that the demons do not dare to approach.