The shrimp head turns black and is not fresh? Tips for choosing fresh shrimps 123

Steamed shrimps, pepper shrimps, garlic shrimps, drunken shrimps... Once all kinds of delicious shrimp dishes are served on the table, even if they require peeling the shells, they still make many gourmets salivate! For shrimp lovers, "freshness" is the most important factor in determining the deliciousness of shrimp. If you see the shrimp head turning black, it means the shrimp is not fresh enough. However, nutritionist Huang Xiaotong said that this is a wrong concept!

The shrimp head turned black ~ the problem is "tyrosine"

Nutritionist Huang Xiaotong said that the shrimp body is mainly divided into "cephalothorax" and "plasmos". The cephalothorax is rich in a component called "tyrosine". After the shrimp is captured and leaves its living environment, the oxidative enzymes in the body will catalyze the metabolism of tyrosine to produce melanin, forming black spots on the surface of the shrimp body, especially on the head, tail and feet. This phenomenon is called "melanization".

After the shrimps are caught and brought ashore, if they are not quickly frozen or the freezing temperature is not ideal, the changes in air and temperature may accelerate the blackening of the shrimp heads. However, this is a natural phenomenon. Fresh shrimps will also turn black, so the blackening of shrimp heads has no direct relationship with their freshness .

Blackened shrimp heads are not fresh. Bright colors are scary.

Compared with shrimps that have turned black in color, shrimps with bright colors and almost no blackening phenomenon are more worrying! This is because many Taiwanese people have a deep-rooted misconception that "shrimp heads turning black = not fresh", which has led many unscrupulous businessmen to use excessive amounts of food additives in order to improve the appearance of their products and avoid a decrease in sales. They hope to inhibit the oxidative enzymes in the shrimp's body from coming into contact with air, preventing the shrimp from turning black and making them less likely to spoil. If people eat these shrimps containing excessive illegal additives, it will cause harm to their health.

The cephalothorax of shrimp is rich in a component called "tyrosine". When it is exposed to air or the freezing temperature is not ideal, the speed at which the shrimp head turns black will be accelerated.

Carefully selected fresh shrimps! Nutritionist Recommends Step 123

In this regard, nutritionist Huang Xiaotong suggested that when people buy shrimps, they should grasp the steps of "1 check the appearance, 2 look at the color, 3 smell the smell" . First check the shrimp body and shrimp head. Fresh shrimps should be naturally curled, the shrimp shell should be clear, transparent and shiny, and the meat should be plump and elastic to the touch, not sticky. The shrimp head and shrimp body should be tightly connected without any looseness. Finally, smell the smell. If there is a rotten odor or strange smell, it means it is no longer fresh and the meat has deteriorated, so you should try to avoid buying it.

Shrimp is nutritious and can help you lose weight and prevent cardiovascular disease

Nutritionist Huang Xiaotong said that shrimps have high nutritional value and are rich in protein, but low in fat, so they are also low in calories. Although the nutritional value varies slightly depending on the type of shrimp, a 30-gram serving of shrimp has an average calorie content of only about 55 calories, which is lower than beef and pork. For people who want to lose weight, shrimp is a very good choice.

In addition, shrimp also contains taurine, which has the function of lowering cholesterol, preventing arteriosclerosis and reducing the incidence of cardiovascular diseases; shrimp is rich in zinc, which helps to improve immunity, enhance the body's defense capabilities, promote cell division and growth, and maintain the normal functions of skin, taste bud cells, and sperm. If you eat shrimps together with their shells, you can also supplement with rich calcium and chitosan, which helps prevent osteoporosis and helps stabilize blood pressure.

Eating shrimps together with the shells can also supplement rich calcium and chitosan, which helps prevent osteoporosis and stabilize blood pressure.

To be healthy, don’t eat blindly! 4 principles for eating shrimp safely

Although shrimps are delicious and nutritious, you can't eat them without restraint. Nutritionist Huang Xiaotong reminds us that shrimps hide the following 4 traps. People must pay special attention when eating them so that they can eat shrimps healthily and avoid going blind!

【Four principles for eating shrimp healthily】

1. The cholesterol content of shrimp is highest in the shrimp head and shrimp eggs. Simply removing these two parts can reduce the cholesterol intake.

2. People who are allergic to seafood or suffer from allergic diseases should try to avoid eating shrimp.

3. The shrimp thread on the back of the shrimp is the waste that the shrimp has not excreted and should be removed when eating.

4. Shrimp must be cooked thoroughly before eating to avoid food poisoning.