Fasting blood glucose 6.4mmol/L, belongs to pre-diabetes, control of diet is likely to return to normal, but also need to combine with appropriate exercise, but there are still some patients can not be restored or progress to diabetes. Fasting blood glucose 3.9-6.0mmol/L is normal, 6.1-6.9mmol/L is impaired fasting blood glucose regulation, ≥7.0mmol/L along with diabetic symptoms can be diagnosed as diabetes. Fasting blood glucose 6.4mmol/L, does not meet the diagnostic criteria for diabetes, belongs to pre-diabetes. With dietary control and proper exercise, it is possible to return to normal blood sugar. The specific situation varies from person to person, and there are some patients who cannot recover or progress to diabetes. Abnormal fasting blood sugar is recommended to consult a doctor for early intervention.