Every autumn is the best season to eat crabs. Many parents will give them to their children, but eating them incorrectly can easily bring harm to their health.

Some time ago, two "Fat Brothers Meat Crab Pots" in Beijing were exposed by reporters to sell dead crabs as live crabs.

While strongly condemning the merchants, many netizens asked-

What are the hazards of eating dead crabs?

how long does it take for crabs to die before they can eat?

how long can cooked crabs be kept?

.......

While giving children delicious food, you should also pay attention to safety and give them crabs. You should know these knowledge

First, why not eat dead crabs?

The risk of poisoning is high

After the animal dies, the bacterial reproduction in the digestive gland may lead to the spoilage of the whole food. As an omnivore, crabs are particularly at high risk.

There may be a lot of bacteria in the food it eats. After death, bacteria multiply and corrode crab meat very quickly.

in this process, not only the taste and mouthfeel of crab meat are greatly reduced, but also some biogenic amines harmful to human body are produced, which cannot be removed even if heated at high temperature.

Some biogenic amines are very toxic. A few milligrams may cause poisoning, which may lead to vomiting, diarrhea, allergies and other symptoms, and may cause shock and organ failure in severe cases. Therefore, its content should be strictly limited.

Therefore, it is really necessary to pursue the "freshness" of crabs. Even many online crab shops will make promises of "ensuring freshness" and "paying for dead crabs".

how long can I not eat after I die?

Some people think that they have spent a lot of money on crabs, and it is really reluctant to throw them away if they die. Is there a time limit for eating them in a short time after death?

If you can know the time of death, it is acceptable in a short time.

some people have done experiments. at room temperature, the content of histamine in hairy crabs increased from 3mg/1g to 6mg/1g after they were left for 3 hours.

in a few hours, it will grow to 7 or 8 milligrams, which may have caused slight poisoning.

if it is completely refrigerated, it will almost reach this amount after one day of death.

From the point of view of bacterial reproduction and histamine growth rate, dead crabs can be considered to give up eating if they are kept at room temperature for more than three hours or refrigerated for more than one day.

once again, the premise is that you have to know when it died. If the hairy crabs in the food market stalls are already dead, I suggest not to buy them. When I wake up, I find that they were alive and dead last night. I say it's best not to eat them either.

Moreover, everyone is sensitive to these harmful substances in different degrees, and may have adverse reactions after eating only a little. Dead hairy crabs are still not recommended for everyone.

how long can cooked crabs be kept?

Some people say that I steamed the crabs alive, but I steamed a lot. Can the cooked crabs be kept longer?

Actually, it's not just crabs. Usually, a lot of leftovers can't be kept for a long time. The water, protein and other nutrients in it can still provide good breeding conditions for bacteria.

if it is stored at room temperature for less than 4 hours, or refrigerated for less than 1 day, and reheated before eating, it is also ok.

but not longer than this.

Just to remind you, the crab shell is thick and difficult to heat thoroughly. You can steam it for a while, or take out the crab meat and heat it separately.

is it okay to freeze live crabs?

besides buying fresh crabs, is there any way to keep them safely in advance?

You can consider putting the crab directly into the freezer when it is alive, and then taking the amount you want to eat each time when you want to eat it.

Related experiments show that even in ordinary families, freezing for two or three weeks is basically no problem.

Frozen live crabs in the refrigerator at home are not the same as those directly bought. Other self-frozen foods and quick-frozen products will have the same problem.

The temperature of the frozen food in the household refrigerator is slowly decreasing, and water will gradually form small ice crystals in the microstructure, which may puncture the original cell structure. Specifically, the meat quality may be affected.

The quick-freezing technology can not destroy the original cells, and the quality will be higher.

Second, don't eat these four parts when eating crabs

Jiang Hong, a nutritionist in the Nutrition Department of Hangzhou First People's Hospital affiliated to Zhejiang University Medical College, once pointed out that when eating crabs, it is necessary to get rid of crab stomach, crab intestine, crab heart and crab cheeks, which are organs for filtering and metabolizing waste, have no edible value, and contain a lot of bacteria and parasites, which are easy to cause food poisoning.

The crab's stomach is commonly called "crab urine bag". In the center of the front edge of its dorsal shell, it is a triangular bone packet with sludge in it. Crab intestine is a black line from crab stomach to crab navel; Crab heart is commonly known as "hexagonal plate"; Crab cheeks are commonly known as "crab eyebrows", that is, two rows of soft things like eyebrows that grow in the abdomen of crabs.

Third, steam the crabs for 2 minutes after the water is boiled

Boiling crabs with water will make the delicious and nutritious components in crabs spread into the water, thus destroying the delicious flavor and nutritional value of crabs. Steaming is a good way to make crabs, because steaming is higher than boiling, which not only cooks quickly, but also kills microorganisms and parasites on crabs. Steamed crabs can also keep the integrity of the crab body, make its color ruddy and bright, and at the same time, reduce the pollution of crab meat by the gastrointestinal contents of crabs.

but it should be noted that crabs should be washed before steaming. Hold the two sides of the big cover at the root of the crab's two rows of legs with your hands (no matter how you move this place, the crab can't hold your hands), and then brush all the places you can with your toothbrush. When steaming crabs, you should pay attention to steaming them for at least 2 minutes after the water is boiled, and it is possible to kill the germs when they are cooked thoroughly.

Fourth, eating crabs can be accompanied by some food that warms the stomach

Xu Huichao, from the Nutrition Department of the Affiliated Hospital of Jining Medical College, Shandong Province, once pointed out that eating crabs needs to be accompanied by things that warm the stomach, such as Jiang Mo, vinegar and yellow wine, which is related to the traditional Chinese medicine that crabs are cold.

In China, it has been thought since ancient times that yellow rice wine and crabs are a wonderful match. Although the crab is delicious, it is cold in nature, and eating too much is easy to hurt the stomach. Yellow wine has the effect of promoting blood circulation and warming the stomach, so it has always been considered as the best choice to remove the cold when eating crabs.

5. Although crabs are delicious, don't eat too much

Crabs have high cholesterol content, especially crab roe, so crabs should be eaten in moderation, not too much, otherwise it will easily lead to high cholesterol. In addition, crabs are cool foods, so people with spleen and stomach deficiency and cold are not suitable for excessive consumption.

six, choose crabs, mainly look at five aspects

When choosing crabs, you should look at the following five aspects:

When you look at the color, fresh crabs are "green-backed and white-bellied, with golden claws and yellow hair", the back shell is turquoise and shiny, the abdomen is white and full, and it can spit bubbles continuously.

Second, depending on the individual, choose a big, old and healthy crab, so that the crab meat is more compact.

Third, look at the navel. The navel should protrude outward. No matter whether it is a male crab or a female crab, such crabs are generally full of fat.

Fourth, look at crab hair. Crabs with hairy feet and hard legs are the fattest.

5. Looking at the movements, the fresh crabs have strong clamping force, complete crab legs, fast and powerful crawling, and agile and active movements. ④

Crabs should not be eaten by people in categories 7 and 7

Crabs should not be eaten by patients with hepatitis

Patients with hepatitis are prone to indigestion, abdominal distension, vomiting, etc. due to gastric mucosal edema, abnormal bile secretion and decreased digestive function, while crab meat is rich in protein, which is difficult to digest and absorb.

People with cardiovascular diseases should avoid eating crabs

Crabs contain high cholesterol, with 235 mg of cholesterol in every 1 grams of crab meat and 46 mg of cholesterol in every 1 grams of crab roe. Eating foods with high cholesterol in patients with coronary heart disease, arteriosclerosis, hypertension and hyperlipidemia will lead to increased cholesterol and aggravate the development of cardiovascular diseases.

People with colds and fever should not eat crabs

The diet of colds and colds should be light, and crabs with high protein are not easy to digest and absorb, and it is easy to make the cold difficult to recover or make the illness worse after eating.

Anyone with spleen and stomach deficiency and cold should not eat or eat less crabs

Crabs are cold, which can easily cause abdominal pain, diarrhea or indigestion after eating. Patients with chronic gastritis and gastric and duodenal ulcer had better not eat crabs, because it is easy to make the old disease relapse or worsen after eating.

People with allergic constitution should avoid eating crabs

After eating crabs, the specific crab protein enters the body through the intestinal wall with increased permeability, resulting in allergic reaction, and a large amount of histamine is produced, which causes smooth muscle spasm and vascular edema in the gastrointestinal tract, resulting in nausea, vomiting, abdominal pain and diarrhea; Some can also cause urticaria or asthma. In addition, people suffering from skin diseases such as dermatitis, eczema and tinea should also eat carefully, because eating crabs can make their condition worse.

People with biliary tract diseases should not eat crabs

Such as cholecystitis and cholelithiasis. The formation of cholecystitis and gallstones has a certain relationship with excessive cholesterol and metabolic disorders in the body. Eating crabs is easy to make the disease relapse or get worse.

pregnant women should eat less or not eat crabs

Chinese medicine believes that crabs are cold and have the function of promoting blood circulation and removing blood stasis, so they are not good for pregnant women.

Eight, the first person to eat crabs

In China, crabs are not only a delicacy, but also a culture. For people in China, eating crabs has a history of thousands of years.

Mr. Lu Xun's famous saying that "the first person to eat crabs is a warrior" has been passed down to this day. So who was the first person to eat crabs?

There is a legend in Suzhou: According to legend, in Dayu's time, river crabs were called "human-trapping worms". During Dayu's flood control, a overseer named PLO dug a deep ditch and put hot water in the station to prevent the invasion of "human-trapping insects". As a result, the scalded "human trap" had a unique fragrance, and PLO picked it up and tasted it, which was delicious. From then on, "catching people" has become a delicacy on earth. Because the PLO suppressed this "human trap", it was named "crab".

In fact, China has been eating crabs for more than 6, years. In the Yangtze River Delta, archaeologists found that there were a lot of crab shells in the waste eaten by ancestors, which showed that Chinese people had a long history of eating crabs.

In the history of China, how many literati fell at the door of "heartless son", and they all praised the delicacy of crabs from all angles. In the Song Dynasty, Xu Sidao, the commander of Wujiang, wrote a poem entitled "You can't live up to your goal if you don't reach Lushan Mountain, and you can't live up to your stomach if you don't eat crabs", which has become a famous sentence in crab culture and spread widely. Li Bai, a poet in the Tang Dynasty, once praised: "Crab claws are golden liquid, and bad hills are Penglai. And you must drink wine and get drunk on the platform by the moon. " However, among the poems about crabs in the past dynasties, the most famous one is Pi Rixiu's Poem about Crabs, which says, "You are famous before you swim in the sea, but you have bones and you are born from meat. Mo Dao is not afraid of lightning, and the sea dragon king is also rampant. " With only a few figures, the crab's rampancy and fearless temperament are vividly on the paper. "

nine, not enough hands and feet? Tools to gather together

In the Ming and Qing Dynasties, it was a cultural enjoyment for literati to taste crabs. When appreciating chrysanthemums, reciting poems and spitting crabs, everyone had a set of special tools. Suzhou, Shanghai and Hangzhou were commonly known as "eight crabs". "Eight pieces of crab" include crab pier, crab hammer, crab axe, crab tag, crab scissors, crab tweezers, crab knife and crab spoon, which have various functions such as padding, knocking, splitting, forking, shearing, clamping, picking and holding.

First, put the crab on a small square table (crab pier), cut off two big claws and eight feet one by one with a crab scissors, gently tap around the crab shell with a hammer, then split the back shell and navel with a crab axe, and then take a crab knife, crab tweezers, crab stick, crab hammer, crab spoon, or pick or clamp or fork or knock or hold, and take out the golden and shiny crab paste or milky white adhesive. One tool is used in turn, and one function is played alternately, as if playing a cadence food song.

from the Ming dynasty to the early years of the Republic of China, on this basis, there were 1 or 12 crabs, and then at its peak, there were as many as 64 sets of crab eating tools.

I would like to remind parents that crab meat is beautiful, but don't give your children too much, and don't give them dead crabs to save money.

Some of the materials in this article are integrated from nutritionist Gu Zhongyi, Health Times, Shandong TV Life Channel, Healthy Hangzhou, China Science Expo, etc.