Diabetic patients can eat zero calories sugar, but it is not recommended to eat more. Diabetes mellitus is a disease caused by defective insulin secretion and/or utilization. Clinical manifestations include hyperglycemia, appetite, weight loss, increased water intake, and increased urine output. Zero-carb sugars, also known as sugar substitutes and sweeteners, do not have the molecular structure of carbohydrates and will not stimulate insulin secretion after consumption. There are a variety of sweeteners available on the market today, commonly known as erythritol, maltitol, stevia and others. However, excessive intake may have some adverse effects on the body, so it is not recommended to eat more. Diabetic patients should maintain a healthy lifestyle in their daily life, and at the same time follow the doctor’s instructions for standardized treatment.