Fish and "Yu" homophonous, so eating fish in the New Year means that there is more than one year, as long as the dinner table says auspicious words, the old man will definitely say that there is more than one year and the next year is rich. In fact, he also has a layer of meaning - to lower demons and exorcise ghosts. In the ancient Han Dynasty, the fish painted on the threshold played a very important role in the demon.

In the Tang Dynasty, the fish motif appeared on the doorknob, on the gate, on the cabinet door, on the box door in order to drive away the ghosts. With the passage of time, people gradually forgot the meaning of descending demons and exorcising ghosts, leaving behind more than one good wishes every year.

We have an old saying in China: rely on mountains to eat mountains, rely on water to draft water. Human consumption of fish dates back 2 million to 5 million years, when people began to settle in rivers and seashores, because fish are easier to obtain, so there is a history of human fish eating.

The reason why we still eat fish to this day is not only because the fish is easy to obtain and delicious, but also because of the benefits of fish to our body.

However, some unscrupulous traders have seen this good time, taking the opportunity to sell some fish with formaldehyde and heavy metals, these fish are not only unable to maintain health after being eaten, but also damage health, I hope that everyone can polish their eyes and buy cautiously.

What are the benefits of eating fish for the body?

1. Protect cardiovascular and cerebrovascular diseases

Fish meat is rich in unsaturated fatty acids, which can inhibit the aggregation of platelets in the blood and effectively reduce blood viscosity. Helps protect the cardiovascular system and prevents diseases such as atherosclerosis, coronary heart disease or myocardial infarction.

Fish is also rich in magnesium, which has a good protective effect on the cardiovascular system

2. Puzzle

Fish is rich in phospholipids, which can act directly on brain cells, helping to improve brain function and improve the ability to think quickly. The unsaturated fatty acids in fish meat can promote nervous system metabolism and improve symptoms such as Alzheimer's disease and decreased thinking ability.

3. Boost immunity

Fish contains a large number of proteins, amino acids and other components, which are easily absorbed by the human body, which helps to improve its own immunity and resistance, and prevent the body from being invaded by bacteria and viruses.

4. Vision improvement

Fish meat is very rich in fatty acids, which can protect our retina from oxidative invasion, has a certain vision improvement effect, and the effect of deep-sea fish is more obvious.

Of course, fish has other effects, such as eating fish is not easy to gain weight, which is good news for some beauty lovers, and pregnant women can eat some fish appropriately, which is also conducive to preventing pregnancy edema.

It is recommended to stop eating these 5 kinds of fish, or contain formaldehyde and heavy metals, and advise you to understand as soon as possible

1. Marinated salted fish

Many people like to use pickled salted fish to cook, but in fact, in the process of salting, nitrite will react with the protein breakdown product amines in the pickled products to form nitrosamines, and nitrosamines are a strong carcinogen.

Even the International Agency for Research on Cancer (IARC) has listed Chinese-style salted fish as a Class I carcinogen. But this does not mean that everyone can not eat salted fish at all, just for health to eat less.

2. Large carnivorous fish

Here we are mainly talking about swordfish, sailfish, squarehead fish, marlins, these fish, they belong to the higher level of the food chain in the marine environment, big fish eat small fish, small fish eat shrimp rice,

This means that these large fish accumulate more harmful substances such as heavy metals, such as mercury. Therefore, it is not recommended for pregnant women, women trying to conceive, lactating women and children.

3. Undercooked fish

Friends who like to eat Japanese food must be familiar with sashimi, and the fat salmon is the favorite, but one of the more common parasites in marine fish is the heterocephalus nematode, in addition to salmon, cod, striped fish, flounder, yellow croaker and other marine fish may be infected.

Infection with xenocephalus does not cause great harm, but it is easy to cause abdominal pain and diarrhea. More severe cases will also have strong abdominal pain, nausea and vomiting after a few hours of eating, so it is still recommended that everyone eat less.

4. Fish of unknown origin

Fish in the hands of unqualified traders, fish caught by others in small lakes or fish caught in the river, it is best not to give them to children.

These fish have not been quarantined, do not know the content of heavy metals, and the small lakes in the city are the most vulnerable to pollution, and the heavy metal content of the fish inside is generally relatively high.

5. The fish freezes for too long

In order to extend the shelf life of fish, many people will put fish in the refrigerator for preservation, which not only prolongs the storage time of fish, but also avoids the spoilage of fish.

However, the nutritional value of long-frozen fish has long been lost, so when selecting fish, try to press the fish's body to determine how long the fish has been frozen.

If you find that the eyes of a fish are particularly cloudy, it means that the fish meat has not been fresh for a long time. Don't spend unjust money to buy it.

How do I pick when buying fish?

1. Try to choose live fish

This sentence feels a bit redundant, but it's actually quite practical. In general, lively fish are very healthy. This meat is not too fresh, but it is not too old. If it's inconvenient to take it, it's better to buy it now and kill it now.

2. Observe whether the fish is elastic

Usually, they will choose one after watching, or let the store catch one at random, which will make the freshness of the fish impossible to guarantee. To buy fish, you should touch it with your own hand, grab it, and then make a choice. The tightness of the pinched fish can judge the quality of the meat, and if the fish's body is very elastic, it means that the fish is fresh. If it is not elastic, or even hard, it is recommended not to buy.

3. Don't buy dead fish that have already been killed

Many people may choose this simple and fast way because they are busy commuting, resulting in a rush of time, but there is a lot of cattiness in it.

Although these fish look fresh on the surface, they may have a fishy or sour smell when they buy them back. In fact, this fish has long been dead, because they are stored in the ice cubes, so people can not smell strange.

Can fish scales be eaten?

Fish scales are not poisonous, so they can be eaten. Fish scales are the bone produced by the collagen of the dermis layer of the fish, scientifically known as fish scale hard protein, which can protect the body of the fish and prevent water loss to the shell, generally fan-shaped.

Studies have shown that fish scales contain a variety of vitamins, but also contain iron, zinc, calcium and other trace elements necessary for the human body, while fish scales also contain relatively rich collagen.

Collagen is a type of collagen fiber whose main function is to act as a binder to connective tissue, making the skin firm and elastic. There are also studies that believe that fish scales contain high chitin, which has a certain effect on improving immunity.

Fish scales can be eaten, but it is recommended to try to choose fish with softer scales, thick and hard fish scales believe that most people will not choose to eat.