What does it mean to save food, prohibit waste and re-examine food security?

Saving food, prohibiting waste and re-examining food security mean that this is a national thinking. Of course, the mode of production has been greatly improved and people's livelihood is rich, but the country still needs to import a lot of food every year. Considering that there are many phenomena of wasting food in current society, it is necessary to save food, which involves national security and advocates the virtue of saving.