Firstly, do not eat high-fat foods:
Medical experts point out that, although the fat itself is not carcinogenic, while long-term intake of high-fat foods will increase the level of cholic acid and neutral cholesterol in the large intestine. The storage of these substances can induce colon cancer. As the same time, the high-fat foods can increase the synthesis of prolactin, and will lead to breast cancer, which is harmful for the health of the mothers and children. The data from a large number of medical research also shows that breast cancer, ovarian cancer and cervical cancer not only have a familial tendency, but also have something to do with long-term high-fat diet. If pregnant women are addicted to high-fat foods, it is bound to increase the risk of cancer in reproductive system cancer in their daughters.

Secondly, do not eat high-protein foods:
Medical researches believe that, inadequate supply of protein will make women physically weak, lead to slow fetal growth, delay postpartum recovery, and so on. As a result, pregnant women should take in 90 to 100 grams of protein every day. However, high-protein foods during pregnancy can affect the appetite of the pregnant women, and increase the burden on the gastrointestinal tract, thus affecting the intake of other nutrients. Studies have confirmed that, if the body take in too much protein, the human body can produce a large amount of hydrogen sulfide, histamine and other harmful substances, which are likely to cause abdominal distension, anorexia, dizziness, fatigue and so on. At the same time, other scholars also believe that, the excessive accumulation of protein in the connective tissue can cause the degeneration of human tissue and organ, which can make people easily suffer from cancer.

Thirdly, do not eat high-calcium foods:
If the pregnant women blindly eat too much high-calcium foods, such as taking a large number of calcium tablet or vitamin D preparation, it is very harmful to the fetuses. Nutritionists believe that, if the pregnant women take in excessive calcium, the fetuses may easily suffer from hypercalcemia, which is not conducive to the growth and development of the children. In general, during the early pregnancy, pregnant women only need 800 mg of calcium every day; and later it can be increased to 1100 mg. There is no need to supply calcium additionally. They can just appropriately take in the calcium from daily foods, such as dairy products, fish, meat, eggs and so, which is enough to meet pregnant women's essential requirement for calcium.