You can drink milk after eating crabs. There is no specific definition of time, as long as we don't eat together. The reason for this is the following：

1, the cholesterol in crabs will react with protein in milk to produce a substance that can harm human body.

2. The substances produced by crabs after drinking milk enter the blood, which will hinder the circulation, digestion and absorption of blood.

3. Crab and milk are rich in animal protein, and eating together will affect the absorption efficiency.

Crabs are advised not to eat too much for the following reasons:

1, because crabs are cold and easy to have diarrhea.

2. The cholesterol content in crab roe is high. People with coronary heart disease, hypertension, arteriosclerosis and hyperlipidemia should eat less or not eat crab roe, otherwise it will aggravate the condition.