Why does

egg yolk turn green

Dr. Zhong Kai, deputy director of Kexin food and nutrition information exchange center and deputy director of Kexin food and nutrition information exchange center, many people are used to eating a boiled egg in the morning, but a recent video about boiled eggs in the circle of friends has made them worry about their health. Experts in the video said that if the yolk of boiled eggs turns green outside, it will affect protein digestion and may also cause cancer. Many people say that their boiled eggs turn green every day. What’s the matter?

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in fact, this is a normal phenomenon, because the egg boiled for a long time, methionine will release sulfide and react with the iron in the egg to form dark ferrous sulfide, which will cause the yolk surface to turn green, but eating it will not cause cancer. First of all, the little sulfide on the egg yolk is very small, which may change into hydrogen sulfide and ferrous chloride under the action of gastric acid. If it does not react with gastric acid, it is also a water-insoluble compound and will not participate in the metabolic process.

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were the second. The sulfide in egg yolk did not affect protein digestion. Methionine is not only found in eggs. It is also called methionine. It is a common amino acid in food and is harmless to human body.

finally, the human intestinal digestion process is microbial fermentation, and the production of hydrogen sulfide, biogenic amines and other metabolic wastes is very normal. The amount of hydrogen sulfide in the intestinal tract is far more than the insoluble ferrous sulfide on egg yolk, so you can eat it at ease.

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