Updated June 06, 2005

Rapid-Acting Insulin
Timing It Just Right

by Hope Warshaw, M.M.Sc., R.D., B.C.-A.D.M., C.D.E.

The American Diabetes Association advises that postprandial blood glucose shouldn’t exceed 180 mg/dl (plasma value) at two hours after the start of a meal. Other associations and experts believe the two-hour postmeal goal should be less than 140 mg/dl. Occasionally checking your blood glucose after a meal at hours one, two, and three can help you determine when your blood glucose level peaks and starts to come down again. According to Scheiner, "Research shows that it is common for people to have elevated blood glucose levels after meals." One key to controlling these highs is better timing of rapid-acting insulin.

Because responses to insulin and carbohydrate can vary (because of, say, activity level or meal composition), some people find it helpful to record their experiences for future reference in a notebook, computer file, or logbook. Chart the foods you eat and the amounts, the amount of insulin you take to cover the food, your blood glucose levels before and after you eat, when you exercise and how vigorously, and any lessons you learn. Although perfect control is impossible, your personal database can help you obtain a better understanding of your blood glucose readings and how to fine-tune your diabetes control.

The right time
Delivering rapid-acting insulin at the proper time can help you to achieve optimal blood glucose control. It’s not easy, but by learning when it’s best for you to take your insulin and putting a few tips into practice, you can increase your chances of hitting your blood glucose targets more regularly. For more information about insulin, click here.

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Hope Warshaw is a dietitian and diabetes educator in Northern Virginia. She is the author of numerous books about diabetes nutrition management including Complete Guide to Carb Counting, 2nd ed. (2004) and Guide to Healthy Restaurant Eating, 3rd ed. (March 2005). Both books are published by the American Diabetes Association.

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