The following blood sugar measurements are considered healthy and normal according to the American Diabetes Association
If you’re generally healthy (you don’t have diabetes) and you haven’t eaten anything in the past eight hours (you’ve been “fasting”), it’s normal for blood sugar to be anything between 70–99 mg/dL (less than 100 mg/dL).
If you’re healthy and you’ve eaten within the past two hours, it’s normal for blood sugar to be anything less than 140 mg/dL.
•If you do have a history of diabetes, fasting glucose should ideally also be below 100 mg/DL, which might need to be managed through the use of insulin. It’s also considered healthy to have levels between 70–130 prior to eating.
If you have diabetes and you’ve eaten in the past two hours, the goal is to have blood sugar below 180 mg/dL.
If you have diabetes, you want to keep blood sugar between 100–140 mg/dL prior to bedtime and at least 100 mg/dL prior to exercising.