People with cold and flu and fever should not eat crabs because their gastrointestinal function is relatively weak at this time, and they cannot digest and absorb the high protein in crabs, which makes them prone to gastrointestinal discomfort.

Stored cooked crabs are highly susceptible to bacterial contamination, so crabs should be steamed and eaten now. In case you can't finish it, the rest of the crabs must be kept in the refrigerator and eaten at the next meal, which must be returned to the pot and then boiled hot or steamed through. Overnight crabs are not recommended to eat, back to the pot heating can kill pathogenic microorganisms, but can not destroy the toxins, there is still a danger.

Expanded:

Selection of crabs

Selection of fresh and fat hairy crabs is a technical job. As the saying goes, "September round umbilical October tip", refers to the lunar calendar in September to eat female crabs, the umbilicus is round, this time the female crab yellow full of meat; lunar October to eat male crabs, the umbilicus is pointed, this time the male crab paste full of meat firm.

After choosing a good male and female crab, you can follow the following points to select healthy crabs.

First, pinch: use your thumb and forefinger to pinch up the back of the crab and gently shake it, the crab's claws will droop and follow the shaking of dead crabs, while the crab's claws will be firm and swing on their own are live crabs.

The second is to tease: you can tease the eyes of the crab with your hand, and if it reacts immediately, it means that it is full of vigor; or turn the crab over with its abdomen facing the sky, and if it can turn its body over quickly, it means that the crab is strong in vigor, and vice versa, it means that it is poor in vigor.

The third is to see: look at the back of the shell was black-green, with gloss, for meat thick and strong; look at the end of the tail, navel protruding, and the crab umbilicus on both sides of the red (commonly known as the "red seal"), generally fat fat full of paste; look at the crab feet on the tufts of fluffy hair, the crab feet old and healthy, the crab feet without tufts of fluffy is soft and feeble.

The fourth is to try: if conditions permit, put the crab into a pot of water, will spit foam is live crab.

People's Daily Online - Five taboos to remember when eating crabs "Crab" meets delicious and healthy