If the shrimp hair black, but the shrimp body is not black, can still eat. If the shrimp head and body are blackened, and there is an odor can not be eaten, eat a moderate amount of fresh shrimp can be supplemented with nutrients and energy.
If the shrimp hair black, may be the shrimp head contains amino acids are converted to quinones by enzymes, and quinones will form melanin, if the shrimp melanin accumulation caused by shrimp black is able to eat.
If the head and body of the shrimp are blackened, and there is an odor, it means that shrimp spoilage, generally can not be eaten. If you eat spoiled shrimp, may cause abdominal pain, diarrhea and other gastrointestinal discomfort.
Usually you can eat fresh shrimp in moderation, generally 100 grams of shrimp contains 18.3g protein, 1.6g carbohydrate, 420mg carotene, 17μg vitamin A, 253mg phosphorus, 37mg magnesium, 19.10μg selenium, 35mg calcium, 45.9% saturated fatty acids, 183mg cholesterol, etc., shrimp is rich in nutrients, moderate intake can be for the organism to replenish Nutrients and energy.
Shrimp blackened did not appear deterioration can be eaten, if the shrimp blackened, and appeared to deteriorate can not be eaten.