It is said that Japanese people like to eat natto because it has magical effects. First of all, natto can prevent diseases, such as breast cancer, osteoporosis, constipation and menopausal diseases, and eating natto can help them recover as soon as possible. In addition, natto can also resist aging. Natto contains a lot of isoflavones. The advantage of women eating natto is that it can regulate the hormones in women and keep their beauty. Finally, natto can also inhibit virus infection, and many viruses that cannot be treated by drugs can be prevented by natto. In fact, there are still many functions of natto, so the Japanese love it. How much natto the Japanese eat a day is beyond our imagination. It is said that Japan's centenarians account for more than 30% of the world's total, and it is the country with the largest number of centenarians in the world. Therefore, Japan is known as the longest-lived country in the world, with an average life expectancy of more than 86 years, which is almost the same as that of the oldest fish in the world. Therefore, people speculate that Japan's longevity has something to do with natto, but it is not much related. The longevity of Japanese people is caused by many aspects. For example, after World War II, Japan put national nutrition first, and there are special nutrition regulations.