2. After some flour expires, the nutritional value will be greatly reduced, and the toughness of flour will also be reduced, and the food form made of this flour will have some changes. Expired flour may also rot, and eating it will have a certain impact on people.

3. Judging whether the flour has expired depends on whether the flour has the fragrance of wheat. If it is fresh flour, it will smell the clear fragrance of wheat, and if it is left for a long time, it may smell a peculiar smell.