Crab has a high nutritional value and is a high-protein food, also rich in a variety of vitamins, minerals and other nutrients. From the perspective of traditional Chinese medicine, consumption of crab can nourish tendons and benefit qi, strengthen the stomach and eliminate food, soothe the meridians, reduce swelling and disperse bruises, and have a therapeutic effect on bruises and fractures of tendons and bones. The intake of crab meat can also replenish the protein needed by the body, replenish nutrition and enhance the immunity of the body. The nicotinic acid contained in crab meat can help the elimination of toxins from the body, which is helpful for detoxification. However, crab is cold in nature and is also a scavenger food, so it is usually not recommended to eat it on an empty stomach. In addition, it is not recommended to eat dying or dead crabs, because the pathogenic microorganisms that grow in the crab’s body when it is about to die or after it dies can grow and reproduce to produce a lot of toxic substances, which can cause food poisoning and gastrointestinal infections with symptoms such as diarrhea and abdominal distension after consumption. In addition, it is not recommended that people with kidney impairment, cardiovascular diseases, digestive system diseases and allergies consume crab to avoid aggravating the original disease or causing allergic symptoms.