Fasting blood glucose of 5.6 mmol/L is usually normal and does not need to be controlled for people without a history of diabetes, maintaining a normal diet is sufficient, and for people with diabetes who have well-controlled blood glucose levels, it is recommended that they continue to maintain a healthy diet and exercise habits. The normal range of fasting blood glucose is 3.9~6.1mmol/L, so a fasting blood glucose of 5.6mmol/L is within the normal range. For healthy people without a history of diabetes, there is usually no need to control sugar, and it is sufficient to maintain an ordinary diet, but it is still recommended to avoid a high-sugar diet in daily life, which will help your health. If you have fasting blood sugar of 5.6mmol/L and you are not sure whether you need to control sugar or not, you are advised to consult your doctor for a judgment.