Excessive intake of black coffee can also lead to elevated blood sugar. Black coffee contains carbohydrates, 100g of black coffee powder is about 68g of carbohydrates, it is recommended that patients drink a small amount, avoid adding sugar and creamer, intake of excessive black coffee can also lead to elevated blood sugar. It is recommended to monitor blood glucose before and after drinking coffee, and if blood glucose rises significantly, it is recommended to stop drinking immediately. Black coffee is not recommended for diabetic patients with gastroparesis because caffeine can cause esophageal reflux, resulting in esophagitis. For specific dietary contraindications and precautions, it is recommended that diabetic patients consult a medical professional and a dietitian, and rationalize their personal diet under the guidance of the dietitian.