Natto is a soy product made from soybeans fermented by Natto bacteria, which is sticky and rich in protein, fat, minerals, vitamins, dietary fiber, as well as probiotics and phytochemicals, etc. To a certain extent, it can improve the digestion and absorption rate of human proteins, help regulate blood pressure and blood lipids, prevent blood clots, and has certain benefits for patients with microcirculatory disorders. Natto is also good for promoting gastrointestinal peristalsis, helping to relieve constipation, regulating the balance of intestinal flora, and has certain effects on improving constipation, beauty care, and weight loss: 1, improving constipation: as natto is rich in dietary fiber and probiotics, it has the effect of promoting gastrointestinal peristalsis and regulating intestinal flora. The role of microcirculation and digestion and absorption, eating natto for a month may improve skin dullness; 3, weight loss: natto can promote the reproduction of intestinal probiotics, thereby balancing the intestinal environment, accelerate the body’s metabolism, reduce the body’s absorption of fat, eating natto for a month, may have a certain weight loss effect. However, it should be noted that whether or not eating natto will definitely have the above effect varies from person to person. Some people have a more sensitive organism and may experience the above changes within a month of eating it, while others have an insensitive organism and may not experience significant changes no matter how long they eat it. In addition, Natto is only a food and cannot have the same curative effect as medicine. Therefore, for people with constipation or those who need to improve their skin or lose weight, it is recommended that they combine medication with lifestyle modification to avoid relying solely on natto. Some people are not suitable to eat natto, such as patients with gastritis, gastric ulcer and other stomach pathologies, patients with kidney diseases such as nephritis and renal failure, and patients who have not healed after surgery or trauma, long-term natto consumption is not conducive to wound recovery, so it is recommended to avoid eating it.