Moderate consumption of natto by diabetic patients is usually not harmful, if excessive consumption may cause indigestion, excessive consumption of natto by diabetic nephropathy patients will aggravate the burden on the kidneys. Natto belongs to soybean products, which are soybean products made from soybeans through fermentation of various bacilli. According to the Food Nutrition Facts Query per 100g of edible natto contains 211kcal, 19.4g of protein, 11g of fat, 12.68g of carbohydrates, 5.4g of crude fibers, 13mg of Vitamin C, and 23.1ug of Vitamin K. Diabetic patients can eat natto in moderation to supplement carbohydrates, dietary fiber, vitamins and so on. The crude fiber content in natto is relatively high, if diabetic patients eat natto in excess may cause indigestion, bloating, abdominal pain and other symptoms. Diabetic patients should eat and treat reasonably under doctor’s guidance.