You can eat them.

Eggs boiled for a long time, methionine will release sulfide, and the iron in the egg to react, the formation of dark-colored ferrous sulfide, resulting in the surface of the yolk green, but consumption will not cause cancer.

1, the egg yolk on the point of sulfide is very little, in the role of gastric acid may change into hydrogen sulfide and ferrous chloride, if not with the reaction of gastric acid, it is also insoluble compounds, and will not participate in the metabolic process.

2, the sulfide on the egg yolk does not affect protein digestion. Methionine is not only found in eggs, it is another name for methionine, a common amino acid found in food and is harmless to the human body.

3. The human intestinal digestive process is microbial fermentation, which produces metabolic wastes such as hydrogen sulfide and biogenic amines is also very normal. The amount of hydrogen sulfide in the intestines far exceeds that of water-insoluble ferrous sulfide on egg yolks.

Taboo

1, hepatitis patients should not eat egg yolk

Hepatitis patients more consumption of egg yolk will increase the burden on the liver, is not conducive to recovery. Because the yolk contains fatty acids and cholesterol, and fatty acids and cholesterol need to be metabolized in the liver.

2, hypercholesterolemia people should not eat more eggs

Hypercholesterolemia people, especially heavy patients, should try to eat or not eat, or can take to eat egg white and do not eat the yolk of the way, because the yolk of the cholesterol content of the egg white is three times higher than the up to 1,400 milligrams per 100 grams.

3, protein allergy should not eat eggs

Some people eat eggs will have stomach pain, or a rash, which is caused by an allergy to eggs. Egg proteins have antigenic, and the gastrointestinal mucosal surface with antibodies to the role of sensitized mast cells, can cause an allergic reaction, stomach pain or abdominal pain, diarrhea, rash and other allergic symptoms.

References:

People's Daily Online, "The yolks of the eggs are green because they are cooked for too long."

People's Daily Online, "Eating eggs in excess can be fatal, and eating eggs, please pay attention to these taboos".