A good guide to good carbs: The glycemic index

If you have diabetes, you know all too well that when you eat
carbohydrates, your blood sugar goes up. The total amount of carbs you consume at a meal or in a snack mostly determines what your blood sugar will do. But the food itself also plays a role. A serving of white rice has almost the same effect as eating pure table sugar — a quick, high spike in blood sugar. A serving of lentils has a slower, smaller effect.

Picking good sources of carbs can help you control your blood sugar and your weight. Eating healthier carbohydrates may help prevent a host of chronic conditions, especially diabetes, but it is also associated with a lower risk of heart disease and certain cancers.

Get your copy of Diabetes and Nutrition In this report, Healthy Eating for Type 2 Diabetes, you’ll learn about the components of a healthy diet for people with diabetes, as well as how to work with a dietitian, how to develop a meal plan, and how to fit physical activity into your schedule. You will learn how to recognize portion distortion, make wise choices while dining out, and stay on track with your weight-loss plan. Best of all, we’ve included 40 original recipes so you can put this advice into practice — starting today.   SHOW ME MORE →

One way to choose foods is with the glycemic index
(GI). This tool measures how much a food boosts blood sugar.

The glycemic index rates the effect of a specific amount of a food on blood sugar compared with the same amount of pure glucose. A food with a glycemic index of 28 boosts blood sugar only 28% as much as pure glucose. One with a GI of 95 acts like pure glucose.

Glycemic index chart

High glycemic foods result in a quick spike in insulin and blood sugar (also known as blood glucose). Low glycemic foods have a slower, smaller effect.

Choose low glycemic foods

Using the glycemic index is easy: choose foods in the low GI category instead of those in the high GI category (see below), and go easy on those in between.

• Low glycemic index (GI of 55 or less): Most fruits and vegetables, beans, minimally processed grains, pasta, low-fat dairy foods, and nuts.
• Moderate glycemic index (GI 56 to 69): White and sweet potatoes, corn, white rice, couscous, breakfast cereals such as Cream of Wheat and Mini Wheats.
• High glycemic index (GI of 70 or higher): White bread, rice cakes, most crackers, bagels, cakes, doughnuts, croissants, most packaged breakfast cereals.

To learn more about keeping your meals healthy and on track with Diabetes, read Healthy Eating for Type 2 Diabetes, a Special Health Report from Harvard Medical School.

Image: © seramo/Getty Images

Share this story: