The reason why laver is green when cooked:

Laver contains a special pigment protein called "phycoerythrin". This pigment protein is unstable and easily decomposed when heated. When the soup is cooked, the seaweed of phycoerythrin loses its original purple color.

In addition to phycoerythrin, laver also contains pigments such as chlorophyll, carotene and lutein. Among them, the content of chlorophyll is the highest. When phycoerythrin fades, chlorophyll takes the place of phycoerythrin, thus turning the leaves "green", so laver will turn green when cooked. It is the same as chlorophyll in vegetables and has no toxicity.

It is normal that those lavers stored for a long time turn green because of the gradual degradation of phycoerythrin, so you can eat them safely. :

The nutritional value of laver

1. Laver has high nutritional value and contains many essential nutrients for human body. Its protein content is 9 times more than that of fresh mushrooms, and every 1g of laver contains 26.2g of protein. It is also rich in vitamins A, B, B, C and trace elements such as iodine, calcium and iron. Its fat content is also 8 times higher than that of kelp, 2 times higher than that of dried Tricholoma, 1 time higher than that of auricularia auricula and 1 times higher than that of riboflavin.

2. Porphyra contains a lot of iodine, which can be used to treat goiter caused by iodine deficiency. Porphyra has the function of softening hard mass and resolving hard mass, and it is also useful for other stasis lumps.

3. Porphyra is rich in choline, calcium and iron, which can enhance memory, treat anemia of women and children, and promote the growth and health care of bones and teeth; Contains a certain amount of mannitol, which can be used as an auxiliary food to treat edema.

4. The polysaccharide contained in laver can obviously enhance cellular immunity and humoral immunity, promote lymphocyte transformation and improve the immunity of the body; It can significantly reduce the total content of cholesterol in serum. The inhibitory rate of effective components of laver on Ehrlich's cancer is 53.2%, which is helpful for the prevention and treatment of tumors such as brain tumor, breast cancer, thyroid cancer and malignant lymphoma.

People's Daily Online-Is green laver poisonous? Expert: You can safely eat it.