Diabetic patients can eat mustard, but it should be eaten in small amounts. The glycemic index of mustard is 40~45, which is relatively low, but mustard is a spicy and stimulating seasoning, eating more may cause gastrointestinal discomfort, and it is recommended that diabetic patients eat as little as possible. Diabetic patients need to control the total calorie intake of food, light diet, small meals, low sugar, low-calorie food, to avoid elevated blood glucose, to delay the development of complications, but also to balance the nutritional structure, to ensure that enough energy to maintain physiological metabolism. Diabetic patients are advised to observe the changes in their condition and monitor their blood glucose regularly, and to seek medical advice if they feel unwell in order to avoid any delay in their condition.