For the main cause of poisoning, the following preventive measures can be taken:

Vegetables should be properly preserved to prevent decay and do not eat decaying vegetables;

The food left the vegetables can not be stored for a long time at a high temperature before eating;

Do not eat a large number of pickled vegetables, pickles, salt should be put more, at least marinate for more than 15 days before eating; but now the bubble dishes, it is best to eat right away, can not be stored too long, pickles choose fresh dishes;

Don't eat a lot of leafy vegetables in a short period of time, or use water for 5 minutes before cooking;

The amount of nitrate and nitrite used in meat products should be strictly regulated according to the national hygienic standards. No bitter water should be used for cooking porridge, especially for overnight use;

The wrong to prevent nitrite salt or alkali surface when used.