How many crabs a healthy adult can eat a day depends on the situation, depending on the size of the crab, generally around 1~3, with the shell of the total amount of 200g is appropriate. According to the Chinese Nutrition Society’s “Dietary Pagoda for Chinese Residents”, the recommended intake of aquatic products is 40~75g, which is equivalent to about 200g of crabs with shells, and about 1~3 crabs in general. Every 100g of crab contains 535kJ of energy, 19.5g of protein, 5.5g of fat, 0.7g of saturated fatty acid, 340mg of phosphorus, 250mg of potassium, 58mg of magnesium, etc., which is rich in nutritional value. Parasites and bacteria in crabs are stubborn, so make sure that the crabs are steamed thoroughly and do not eat raw or cold crabs. If dizziness, skin rashes and other uncomfortable manifestations occur after eating crabs, you need to consult a doctor in time to avoid allergies, poisoning and other serious life-threatening consequences.