Glycemic Index And Glycemic Load - Ucsf Diabetes Center

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Glycemic Index and Glycemic Load
What is the glycemic index?
The glycemic index (GI) is a tool to measure how individual foods are expected to impact blood
sugar levels.
What does the number mean?
The number is a comparison between individual foods and a sugar called glucose. Glucose is
given a value of 100. If the test food is assigned a value below 100, that food is expected to
impact your blood sugar less than glucose. If the test food is assigned a value over 100, that food
is expected impact your blood sugar more than glucose.
Who may be interested in the glycemic index?
 People who have diabetes may use GI values as an additional tool for managing blood
sugar levels.
 GI values can also be used when treating reactive hypoglycemia.
 Studies have shown that when eating low GI foods, people tend to snack less, which may
be helpful in weight control as well as blood sugar control.
What are the limitations of using glycemic index?
 Glycemic index values were determined in studies where volunteers ate portions
containing 50 grams of carbohydrate of each test food. However, 50 grams of
carbohydrate isn’t necessarily a usual portion size. For example, 50 grams of
carbohydrate from popcorn is ten cups popped, while 50 grams of carbohydrate from
white rice is about one cup cooked.
 There is a wide variation in values assigned to the same food. One source may say a
russet potato has a GI of 56 and another source may say the GI is 111.
 GI values can vary depending on the ripeness of the food, the degree of processing, and
the cooking method.
 Glycemic index values measured the effect of a test food when that food was eaten alone.
Most meals contain a variety of foods in combination. The glycemic effect of a food
changes when it is combined with other foods. For example, fat delays digestion.
 The effect of food on blood sugar can vary from person to person. Blood sugar levels are
also affected by activity, exercise, hormones, and medications.
 A lower GI value does not necessarily mean the food is a better choice. For example, a
chocolate candy bar and 1 cup of brown rice may both have a GI of 55, but the overall
nutritional value is very different.
What is the glycemic load?
The glycemic load (GL) is an equation that takes into account the planned portion size of a food
as well as the glycemic index of that food. Glycemic Load = GI/100 multiplied by the net
grams of planned carbohydrate (net carbohydrate is the total grams of carbohydrate minus the
dietary fiber). In theory, a large amount of a low GI food may increase your blood sugar as much
as a small amount of a high GI food.
GI 4/07

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