With the development of the living standard, people's diet structure is changing. To be amply fed and clothed is not the only purpose now.
People pay more attention to the nutrition of the food and they also care if it can make them vigorous and graceful at the same time. In the pasttime, meat and eggs are considered as the most delicious. Nowadays more and more vegetables take the place of the meat on the table, since people know that there are much more vitamin and fibres in the vegetables than in the meat. Furthermore, vegetables can keep them fit. Meanwhile milk had been accepted by the masses,because of its abundant nutrition. The diet has become a kind of science.The specialists are always telling people what food to eat,what to avoid and what to be put together. All kinds of propanda advertisements hasten us from a new custom.However, some people become the slaves of the new diet custom. They hesitate to eat and lay stress on the diet rules excessively, so that they can't enjoy many delicious dishes.