Shrimp hair black shrimp, if there is no deterioration is allowed to eat, if it is due to deterioration caused by the can not eat.
Most of the shrimp, due to the shrimp head contains an amino acid, stored for a period of time, in the body under the action of biological enzymes, into quinones, and eventually will become melanin, there will be shrimp hair black, and is not due to bacterial infection.
Shrimp head if there is a black color, generally is a normal phenomenon, so you can eat, and will not cause adverse effects on the body. However, if the storage time is too long or improper preservation, shrimp head may also turn black, which is not eaten.
Although the shrimp contains a lot of protein, but if you eat too much will cause bloating, diarrhea and other indigestion symptoms, if you eat shrimp after the body discomfort, you should promptly seek medical examination and treatment.