From paying attention to quantity safety to giving consideration to quantity safety and quality safety. In the stage of satisfying people's food and clothing problem, quantity safety is fundamental. However, under the background of building a well-off society in an all-round way, nutritious, healthy, delicious and high-quality food varieties and diversified food demands are increasingly becoming important choices for consumers.

The transition from food security to diversified food security. With the slowdown of population growth and the deepening of aging in China, and the proportion of rations in people's daily diet structure is getting smaller and smaller, food (rations) security is no longer as prominent as in the past. On the contrary, people's demand for meat, vegetables, fruits and other products is growing, so ensuring diversified food supply has gradually become a new content of food security. Food security has gradually changed from ration security to ration security and feed food security.