Eating sweets is counted from the first bite and blood glucose is measured 2 hours later. Regardless of eating sweets or other foods, blood sugar is generally diagnosed or tested by fasting blood sugar and 2 hours after meal blood sugar, and if the test is not conducted according to this time period, it is called random blood sugar. The fasting blood sugar of people with normal islet function is 3.9-6.1mmol/L, and the blood sugar 2 hours after meal does not exceed 7.8mmol/L. People with normal islet function secrete insulin on demand, so insulin will be secreted rapidly after eating sweets, which makes the blood sugar maintain within the normal range, and the blood sugar 2 hours after meal will not exceed 7.8mmol/L. If the blood sugar 2 hours after meal is 7.8-11.1mmol/L, the blood sugar will not exceed 7.8mmol/L. If the blood sugar 2 hours after meal is 7.8-11.1mmol/L, the blood sugar will not exceed 7.8mmol/L. 11.1mmol/L, it is considered to be hypoglycemic tolerance. If it is >11.1mmol/L, consider whether diabetes has occurred. Random blood glucose is the blood glucose value taken at any time after eating food, and if it exceeds 11.1mmol/L, it indicates the presence of diabetes. Whether eating sweets or eating chocolate, ice cream, or drinking sugar water, the blood glucose value 2 hours after meal is usually tested. If abnormal blood glucose is found, you can go to the hospital for a glucose tolerance test and then determine whether you have abnormal glucose tolerance or diabetes based on the test results.