Porphyra is called "the treasure house of vitamins". The fat content of laver is relatively low, accounting for only 1% ~ 2% of all nutrients, but the content of unsaturated fatty acid EPA, which is beneficial to the development of nervous system, accounts for 52%, plus a large number of minerals and vitamins necessary for human body. Eating seaweed can improve microcirculation, enhance immunity, delay aging and reduce the incidence of cancer and cardiovascular diseases. However, the salt and monosodium glutamate content of dried seaweed is very high, so it is not suitable to eat in large quantities, and it is best not to exceed 50 grams at a time.

Laver can prevent tinnitus and deafness. According to research, the occurrence of tinnitus and deafness is related to the lack of some trace elements, especially the lack of iron can easily denature red blood cells and reduce the ability to transport oxygen. Insufficient nutrition supply in the ear will damage the function of auditory cells and lead to hearing loss. Therefore, iron supplementation is the first factor to prevent tinnitus and deafness. Porphyra contains the most iron in daily food, with an iron content of 46.8 mg per100g. Experts suggest that drinking seaweed soup 2 ~ 3 times a week can ensure the iron content needed by the human body. It is best to add an egg to the soup, because the egg is beneficial to the absorption of iron. Foods containing more iron include shrimp skin, jellyfish skin, black sesame, day lily and so on.

The daily iron intake of people over 45 years old should be no less than 12 mg, and the iron content of the above foods should be above 12 mg per 100 g. Therefore, it is very beneficial to arrange these iron-rich foods in three meals a day to prevent senile tinnitus and deafness.