There are many kinds of seafood, such as seaweeds such as kelp and laver, mollusks such as sea cucumber, jellyfish and squid, and various marine fish, shrimp, mites and shellfish. Seafood is a delicious food on people's table. When people evaluate a table of dishes, they always look at whether there is seafood, but not everyone knows how high the nutritional value of seafood is. Let's talk about these issues. Nutritional value of seafood Because there are many kinds of seafood, the nutritional value of different seafood is different. 1. Seafood is rich in protein fish, shrimp, crab and other seafood, and its protein content is generally around 17%-20%, which is similar to freshwater fish. The composition and content of amino acids in protein are suitable for human needs, and it is a good source of dietary protein. 2. Seafood is rich in unsaturated fatty acids. Marine fish, especially deep-sea fish such as salmon, snow fish and sardines, mainly contain unsaturated fatty acids (including monounsaturated fatty acids and polyunsaturated fatty acids), accounting for about 50%-80% of marine fish fat, and most of them are long-chain polyunsaturated fatty acids, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). These long-chain fatty acids have the functions of lowering blood lipid, preventing thrombosis and preventing atherosclerosis and coronary heart disease, so they are also called "vascular scavengers". In addition, DHA also has a certain brain-strengthening effect. DHA mainly exists in phospholipids in the brain, and phospholipids are the main components of brain cells. Therefore, the lack of DHA can cause the destruction of neuronal processes, make the brains of adults decline ahead of time, and affect the intelligence of infants and young children. Therefore, there are often marine fish in the diet, which is beneficial to health. 3. Seafood is rich in trace elements, such as shellfish, sea cucumber, jellyfish, squid, octopus, cuttlefish and other mollusks. This kind of seafood is rich in trace elements necessary for human body, especially several trace elements that human body is easy to lack, such as iron, zinc and selenium, which are several times or even dozens of times higher than other animal foods. Calculated according to the content of edible parts per100g, the dried razor clam (razor clam and Qing Zi razor clam) contains 88.8 mg of iron, 0.3.63 mg of zinc121. Oyster (Crassostrea edulis) contains 7. 1 mg of iron, 9.39 mg of zinc and 86.64 μ g of selenium. Scallop (fresh) contains 7.9 mg of iron, 7.9 mg of zinc 1 1.69 mg and 20.22 μ g of selenium. Sea cucumber contains iron 13.2 mg, zinc 0.63 mg and selenium 63.93 μ g; Jellyfish contains iron 1.6 mg, zinc 3.32 mg and selenium 82.65 μ g. These are difficult to achieve in general food, so it is beneficial to supplement trace elements in the diet to choose seafood, especially marine mollusks. In addition, some seafood products are rich in iodine, which is higher than that of raw food on land. For example, the iodine content of kelp (dry) is 2400 micrograms, that of laver (dry) is 1800 micrograms, and that of marine fish (fresh) is 13.5 micrograms. The iodine content of razor clam (dry) is 190 μ g, and that of razor clam (dry) is 240 μ g. Iodine is very important to prevent goiter. For teenagers who are in the growth and development period, it is a period of vigorous physiological metabolism, and the amount of iodine needed by the body increases, especially for girls. If the supply is insufficient at this time, mild goiter may occur. Therefore, teenagers should often eat some seafood. If they can eat kelp 1-2 times a week, they can meet their physiological needs. Of course, we should also choose some other seafood to supplement more trace elements.