Crab and shrimp are also excellent food for people who are weak and need to recuperate after illness. Magnesium plays an important role in regulating heart activity, protecting cardiovascular system, reducing cholesterol content in blood, preventing arteriosclerosis and dilating coronary artery, which is beneficial to preventing hypertension and myocardial infarction. However, the head of crayfish contains high heavy metals, which should be removed when eating to prevent poisoning or allergies.

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Precautions for eating crab heads:

1. Shrimp should not be eaten with some fruits. Shrimp is rich in nutrients such as protein and calcium. If you eat with fruits containing tannic acid, such as grapes, pomegranate and hawthorn, it will not only reduce the nutritional value, but also stimulate the stomach and cause discomfort, prone to vomiting, dizziness, nausea, diarrhea and other symptoms after tannic acid and calcium salt combine to form calcium tannic acid.

2, seafood and these fruits should be eaten together, at least two hours apart. ? After eating shrimp, don't eat cold drinks, watermelons and other cold food for one hour.

3. The red, soft and fallen shrimps are not fresh, so try not to eat them.

4. Pick the shrimp line on the shrimp back and don't eat it.

5. Shrimp is hair, which is not suitable for patients with chronic diseases. If you are angry, you shouldn't eat shrimp.

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