Parasitic diseases are both highly prevalent and diverse in Japan. In order to control the problem of parasites, Japan a is very strict control of the source, away from the human living area of the distant sea fish is mainly, followed by frozen, freshly caught tuna is not in line with the standards of raw food with fewer parasites. And Japanese people like to eat wasabi, wasabi can kill bacteria and parasites. In the Japanese diet, steak is fried half-cooked and dipped in wasabi to avoid the fishy flavor. The same goes for sashimi. In a word, dietary habits, a side of the soil to raise a person can not live in a "vacuum", everyone's body will inevitably breed "parasites". Japan's medicine has long been in the ranks of developed countries, raw fish in the hidden parasites, the Japanese must be clear, eating raw fish, but also managed to eliminate.

In order to maintain the taste of raw fish and food value, the international approach is to freeze. In the United States, it is stipulated that raw sea fish must be frozen at -35℃ for more than 15 hours or at -20℃ for seven days before consumption. The EU regulation in this regard is that most of the raw fish eaten by Japanese people are marine fish, and most of the parasites of marine fish cannot form a complete life cycle in the human body and survive in the human body on a large scale. The probability of infection is reduced.

Microsporidia can parasitize the muscles of sea shrimp, cod, and eel. Microsporidia are a class of very tiny individual worms that parasitize cells. The worms generally parasitize tissues such as skin, gills, intestines, kidneys, gonads, liver, spleen and bladder. Sashimi (called "sashimi" in Japanese) is one of the most representative and unique foods in Japanese cuisine. Before the Edo period, sashimi was mainly made from sea bream, turbot, plaice, and sea bass, and the flesh of these fish was white. After the Meiji period, the parasites of cold-water fish, which have reddish colored flesh, caused little harm to humans. Many parasites of freshwater fish have evolved a reproductive process that circulates in aquatic and terrestrial animals, making them particularly susceptible to human infection.