Fish is one of the common foods on our table. There are many kinds of fish. If the nutritional value of fish is subdivided, different fish will have different nutritional values. Today, we will introduce the nutritional value and efficacy of various fish. Come and have a look.

Efficacy and function of fish meat

Eating fish to fight depression: Studies have found that there is a special fatty acid in fish, which is related to the "happy hormone" in the human brain. It has the function of relieving mental tension and balancing emotions. People who don't eat fish or eat less fish often have lower levels of "happy hormones". Americans don't often eat fish, so there are more people suffering from depression.

Eat fish to prevent asthma: Unsaturated fatty acids contained in fresh fish can prevent or reduce the production of inflammatory mediators in human body, and the onset of asthma is closely related to the release of inflammatory mediators. In addition, unsaturated fatty acids can also reduce tracheal inflammation to a certain extent, thus helping to prevent the occurrence and recurrence of asthma or reduce the degree of asthma symptoms.

Eat less fish and suffer from dementia: Canadian scientists have found that the DHA fatty acid content in the blood of healthy elderly people is much higher than that of Alzheimer's patients, and the DHA content in the blood of Alzheimer's patients is 30% ~ 40% lower than that of healthy elderly people on average. Scientists believe that DHA is an essential nutrient for brain cells to exercise and maintain vitality, which helps to improve nerve information transmission and enhance thinking and memory ability. Therefore, eating more fish in the elderly can reduce the occurrence of dementia.

Eating fish to prevent stroke: eating more fish has a protective effect on cardiovascular and cerebrovascular diseases. Studies have shown that the higher the content of protein and sulfur-containing amino acids in the diet, the lower the incidence of hypertension. Fish protein is rich in egg amino acids and taurine, both of which are sulfur-containing amino acids. It can affect the regulation mechanism of blood pressure, increase urinary sodium excretion, thus inhibiting the influence of sodium salt on blood pressure and reducing the incidence of hypertension. Baweifang suggested that one of the effective ways for middle-aged and elderly people to prevent cardiovascular and cerebrovascular diseases is to take three or four grams of fish oil every day.

Eating fish to prevent aging: There was a famous prime minister in German history named Bismarck. He has eaten too much and smoked too much for years. At the age of 68, he was weak, wrinkled and glassy-eyed, as if death were waving to him. But then he listened to the doctor and ate herring every day. Soon, a miracle appeared: his skin was rosy, his eyes were bright and he was full of energy, and he lived until he was 83 years old.

Nutritional value of various fishes.

Crucian carp: It has the functions of invigorating qi and spleen, inducing diuresis to reduce swelling, clearing away heat and toxic materials, dredging collaterals and promoting lactation. Patients with ascites use fresh crucian carp and red beans to make soup, and the effect is remarkable. Simmer fresh crucian carp and pig's trotters together and eat soup together, which can cure puerpera's hypogalactia. Crucian carp oil is beneficial to cardiovascular function, and can also reduce blood viscosity and promote blood circulation.

Carp: It has the functions of invigorating the spleen, stimulating appetite, inducing diuresis to reduce swelling, relieving cough and asthma, preventing miscarriage and promoting lactation, and clearing away heat and toxic materials. Carp, wax gourd and onion are boiled in soup to treat nephritis edema. Scaled carp, intestinal impurities, slow fire stew, respectively, to treat jaundice. Taking live carp and pettitoes soup to treat hypogalactia of pregnant women. Carp and Bulbus Fritillariae Cirrhosae are boiled in small soup to cure cough and asthma.

Silver carp: It has the functions of warming the middle warmer and benefiting qi, warming the stomach and moistening skin, and is a health food for warming the middle warmer and benefiting qi.

Squid: It has the functions of nourishing liver and kidney, nourishing qi and blood, clearing stomach and removing heat. It is a health food for women, which has the functions of dredging menstruation, preventing miscarriage, inducing labor, stopping bleeding and promoting lactation.

Grass carp: it has the functions of warming stomach, calming liver and expelling wind, and is a health food that warms the middle warmer and tonifies deficiency. Nourishing blood and improving eyesight.

Hairtail: It has the functions of warming stomach, tonifying deficiency, moistening skin, expelling wind, killing insects and nourishing five internal organs, and can be used for adjuvant treatment of persistent hepatitis and chronic hepatitis. Patients with hepatitis can take the upper layer oil after steaming fresh hairtail, and long-term use can improve the symptoms.

Eel: It has the functions of benefiting qi and nourishing blood, softening tendons and benefiting bones.

So, what should you pay attention to when choosing fish?

Tips for buying fish

The fish is too red and white to eat. Because of the different kinds of fish, there are red-fleshed fish such as tuna and white-fleshed fish such as hairtail, but if the color of fish is too bright red or bright white, it is probably the "credit" of dyes.

Don't buy those with cloudy eyes and gray cheeks. When buying "chilled fish", you should first observe its eyes and gills. Fresh fish have full eyeballs, clear corneas and bright gills. Secondly, the eyeball of fresh fish is not full, the cornea is wrinkled and slightly turbid, and sometimes the bleeding in the eye is red, and the gills are dark gray-red or gray-purple. Rotten fish eyes collapse or shrivel, cornea atrophy or rupture, and gills are brown or grayish white.

Select a size of "8 points". The size of a fish determines its taste and safety. Too small, the fish has not grown up and matured, the meat is not tender enough, and fishbones will come out. Too big means that the fish is old and the meat is rough, and many harmful substances may accumulate in the body. Therefore, it is more appropriate to buy fish with the size of "eight points". For example, 1.5 kg is suitable for carp and Wuchang fish, 0.5 kg ~ 1 kg for crucian carp and 4~5 kg for grass carp.

Don't choose the wrong color of water in the tank. Buying live fish in the supermarket depends on the "water color". Because it reflects the quality of water, if it is dark green or blue, it may be that there are too many algae, which means that the water has not been changed and the water tank has not been cleaned for a long time, which may affect the health of fish. The fish in a clear and flowing water tank are generally more vivid.

Don't buy it if the price is too low. The price is ridiculously low, and the source, quality and safety of fish should be considered. Eating spoiled fish will bring great health risks.

All kinds of fish have different nutritional values and can be purchased according to their own conditions.