The compositions of egg yolk are very complex. Both yolk and albumen contain various kinds of amino acid. In addition, the protein contained in albumen can restrain the action of proteolytic enzyme. But this kind of protein can be destroyed through heating up the eggs. The undercooked eggs not only contain salmonella which can not be killed completely by high temperature, but also affect the absorption of biotin by the human body, which can cause the lack of biotin inside the human body. Therefore, pregnant women should eat the eggs which have been boiled well.

Some people think that eggs are very nice for expectant mothers to eat so as to supplement essential nutrients. Some women even eat 10 to 20 eggs a day. This behavior is rather terrible. Although eggs can provide relatively balanced nutrients for the human body, this does not mean that people can eat eggs excessively. Pregnant women should eat eggs in a right amount every day. The excessive intake of eggs can endanger the physical condition of them. First, excessive eggs can increase the burden of gastric and intestinal tracts which can affect the normal digestion; second, although eggs contain abundant nutrients, they can not provide all the essential nutrients for pregnant women and take the place of other foods; third, if pregnant women eat too many eggs, they will absorb too much protein which can not be digested and absorbed completely by the human body. Therefore, expectant mothers should eat about four eggs a day.

In fact, the biggest advantage of eggs is that eggs can provide abundant high-quality protein which contains essential amino acid for the human body. This kind of high-quality protein can not only accelerate the brain development of the fetuses, but also improve the breast milk after the delivery. The nutritional value of an egg is nearly equal to that of 200 milliliters of milk. Each 100 grams of egg contain about 680 milligrams of which are mainly contained in yolk. Cholesterol is the main composition of the cranial nerve and many other important tissues. In addition, it can also be transformed into vitamin D. Yolk also contains vitamin A, vitamin B and lecithin, so it is one of the most important and convenient natural foods.

In short, eggs contain essential nutrients needed by pregnant women. However, the excessive intake of eggs can endanger the health of expectant mothers. Therefore, pregnant women should eat eggs in a right amount.