Hairy eggs are chicken embryos that are not formed during incubation. Because the nutrition of eggs has been almost absorbed by embryos at this time, the nutritional value of hairy eggs is not high. Moreover, these eggs contain a variety of harmful bacteria such as Escherichia coli, Staphylococcus, Typhoid Bacillus, Proteus and so on, which are easy to cause food poisoning and other diseases. A real egg is an unfertilized egg. Some unscrupulous merchants use alkali and egg white to blend real eggs. Eating this kind of real egg for a long time is harmful to human body. Rotten eggs are also used to make real eggs. This kind of eggs stink because of long-term storage or cracks, resulting in a large number of bacteria invading and multiplying, producing methane, nitrogen, ammonia and other substances. Even after cooking, amines, nitrite and bacterial toxins still exist, and eating too much will induce cancer.