The old man fish head, most of which can not be eaten, may cause some harm to the body after eating. Daily diet needs to be strengthened management, pay attention to dietary hygiene, balanced supplementation of nutrients, in order to help the body healthy. Parasites may exist in the head of the old fish, improper handling may lead to parasites through the diet into the body, parasites may survive in the intestinal tract or in the organs, and may even survive in the brain. Serious damage can be caused to the intestines as well as to the organs, with bloating, abdominal pain, diarrhea, and possibly a weakening of the metabolic function of the normal organs. If the parasite survives in the brain, it may also lead to weakening of the brain function, easily causing dizziness or headache, affecting normal human health. The old man fish has a high nutritional value, is a protein-rich food, and contains a variety of trace elements and vitamins, eaten in moderation to help supplement the body’s nutritional needs, but you need to remove the head before eating, so as not to cause discomfort. In addition, the old man fish need to avoid eating too much at once, otherwise it will aggravate the burden on the gastrointestinal tract, may cause indigestion, not conducive to nutrient absorption.