Avoid eating a variety of “polluted” food should try to use fresh natural food, avoid eating food containing food additives, coloring, preservatives, cooked food. Fruits should be washed before eating to avoid pesticide residues. Avoid eating caffeinated food Preparing to get pregnant women do not drink too much coffee, tea and other caffeinated beverages and food. Some foreign experts believe that caffeine, as a substance that can affect women’s physiological changes, can change the ratio of estrogen and progesterone in women’s bodies to a certain extent, thus indirectly inhibiting the implantation and development of fertilized eggs in the uterus. Stop drinking and smoking and stay away from second-hand smoke Numerous studies have shown that alcohol and smoking can lead to low-birth-weight babies, miscarriages, and impaired mobility after childbirth. Regular consumption of wine, beer or spirits can reduce testosterone production and increase the number of undesirable sperm in semen. The nicotine and alcohols in tobacco are directly toxic to the spermatogenic epithelium of the testes, which can cause malformed sperm development and reduced sperm count. The development of the fetus formed by the combination of such sperm and egg cells will also be impaired to varying degrees. Avoid pickled foods These foods are delicious, but they contain nitrites and benzo(a)pyrene, which are very bad for the body.