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When fasting one to eight hours how long should it take insulin to bring blood sugar back to normal for non-diabetics? For type 2 diabetics, when should insulin bring blood sugar down?

Fasting blood glucose levels should be less than 100 in those without diabetes. Within four hours of eating, blood glucose levels should return to pre-meal levels. In non-diabetics, blood glucose should always stay under 140 mg/dl. Fasting levels for diabetics should be between 90 and 130.
Goals after eating vary for diabetics; ideally, blood glucose should never rise above 180 mg/dl. Within four hours of eating, blood glucose should return to pre-meal levels. Pre-meal goals are often less than 130 mg/dl.
How quickly insulin works depends upon what type of insulin it is. There is rapid-acting insulin and longer-acting insulin. Ask your pharmacist or doctor about the type prescribed for you.

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