How long it takes to get diabetes with impaired fasting glucose is not certain; it may be a short time, such as less than 1 year, or a long time, such as a lifetime, without developing diabetes. The specifics are as follows: Normal fasting blood glucose range is 3.9~6.1mmol/l, impaired fasting blood glucose refers to fasting blood glucose above 6.1mmol/l and does not reach 7.0mmol/l, and 2 hours after the sugar load blood glucose is less than 7.8mmol/l, belongs to a kind of abnormal glucose tolerance. Impaired fasting blood glucose and the development of diabetes is related to the following aspects. Obese patients are mostly combined with insulin resistance, the chance of diabetes will increase; poor lifestyle, such as diet like high-calorie and high-sugar food, do not like to exercise, like to stay up late, long-term sedentary lifestyle and so on the chance of diabetes will also increase. Impaired fasting blood glucose is recommended for endocrinology consultation.