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Carbs in Bananas

Nutritional Information, Glycemic Index and Load, Carbohydrate Info

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Updated April 02, 2014

bananas
Photo: Alex Cao / Getty Images
Did you know that it is a myth that bananas should always be kept at room temperature? The banana industry has been trying unsuccessfully to correct this misinformation for years. Although the skins will turn black in the refrigerator, the fruit will spoil less quickly if it's refrigerated. On the other hand, bananas have quite a bit of sugar, so low-carb dieters will probably not want to eat them very often.

Carbohydrate and Fiber Counts for Bananas

  • ½ cup sliced bananas: 15 grams effective (net) carbohydrate plus 2 grams fiber and 67 calories.
  • 1 medium banana (7 inches to 7¾ inches long): 24 grams effective (net) carbohydrate plus 3 grams fiber and 105 calories.

Glycemic Index for Bananas

The glycemic index (GI) of bananas varies depending upon how ripe the bananas are. This is because a lot of the carbohydrate in green bananas is in the form of a kind of resistant starch which we lack the enzyme to digest. As the fruit ripens, the starch is converted into readily available sugars.

One study of "under-ripe" bananas came up with a glycemic index of 30. One of "slightly under-ripe bananas" that were "yellow with green sections" produced a GI of 42, while another of "over-ripe" bananas was 52. However, most studies of bananas haven't specified the ripeness, and have come up with GIs ranging from 46 to 70. An average of 52 is usually assigned to bananas.

More Information about the Glycemic Index

Glycemic Load of Bananas

  • ½ cup of sliced banana: 6
  • banana (7 inches to 7¾ inches long): 10

More Information about the Glycemic Load

Health Benefits of Bananas

Bananas are a very good source of vitamin B6 and a good source of vitamin C, potassium, and manganese.

More Information About Bananas at Calorie Count Plus.

Low-Carb Banana Recipe


More Carb Profiles:
Sources:

Leroux, MarcusFoster-Powell, Kaye, Holt, Susanna and Brand-Miller, Janette. "International table of glycemic index and glycemic load values: 2002." American Journal of Clinical Nutrition. Vol. 76, No. 1, 5-56, (2002).

USDA National Nutrient Database for Standard Reference, Release 20.

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