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The glycemic index (GI)is a scientific approach to assess how the carbohydrates in foods affect blood glucose, or blood sugar, levels. It takes the understanding of how much a particular food raises blood sugar to a deeper level, building upon the well-known fact that all carbohydrates raise blood sugar.

The glycemic index assesses foods on a scale of 0 to 100, determining their ability to raise blood sugar levels rapidly. Foods with a higher number cause a more rapid increase in blood sugar, while foods with a lower number have a less pronounced effect on blood sugar levels.

How To Measure Glycemic Index

Glycemic index chart

To determine the glycemic index of a food, a specific weight of the test food (usually 50 grams, which is about 4 tablespoons of sugar) is fed to at least ten healthy volunteers. The volunteers’ blood sugar levels are measured prior to eating and at 15 to 30-minute intervals for two hours, resulting in a blood sugar response curve. 

The food’s blood sugar response is then compared to that of a control food, typically glucose or table sugar, which is assigned a value of 100. The individual responses of each test subject are averaged to calculate the glycemic index number for the food. 

Related: Glycemic Index and Glycemic Load: Meaning and Benefits

Categories of GI


The categorization of foods into low, medium, or high glycemic foods occurs, and they are ranked on a scale of 0–100.

Here are the three categories:

Low= GI of 55 or less

Medium = GI 56 to 69

High = GI of 70 or more

High glycemic index (GI) foods are those that contain easily digestible and metabolizable carbohydrates. Whereas, low GI foods contain slowly digestible carbohydrates that result in a reduced glucose response after a meal.

Related: Myths about Glycemic Index

Glycemic Index of Common Foods

Low-GI Foods (55 or Less)
 FoodsGI
Apple 36
Apple juice 41
 Banana 51
 Barley 28
 Carrots, boiled 39
 Chapatti 52
 Chickpeas 28
Chocolate 40
Dates 42
 Ice cream 51
 Kidney beans 24
 Lentils 32
 Mango 51
 Orange 43
 Orange juice 50
 Peaches, canned 43
 Plantain 55
 Rice noodles 53
 Rolled oats 55
 Skim milk 37
 Soya beans 16
 Soy milk 34
 Spaghetti, white 49
 Spaghetti, whole grain 48
 Specialty grain bread 53
 Strawberry jam 49
 Sweet corn 52
 Taro, boiled 53
 Udon noodles 55
 Vegetable soup 48
 Whole milk 39
 Yogurt, fruit 41
Medium-GI Foods (56 to 69)
 Foods GI
 Brown rice, boiled 68
 Couscous 65
 French fries 63
 Millet porridge 67
 Muesli 57
 Pineapple  59
 Popcorn 65
 Potato chips 56
 Pumpkin, boiled 64
 Soda, non-diet 59
 Sweet potato, boiled 63
 Wheat flake biscuits cereal 69
Wheat roti62
High-GI Foods (70 to 100)
FoodsGI
 Cornflakes 81
 Instant oatmeal 79
 Potato, boiled 78
 Potatoes, instant mashed 87
 Rice milk 86
 Rice porridge 78
 Rice crackers 87
 Unleavened wheat bread 70
 Watermelon 76
 White rice, boiled 73
 White bread (wheat)   75
 Whole wheat bread 74

GI values of foods can be found on the University of Sydney’s GI website

References

  1. Raffetto, M. (2014). Glycemic index diet for dummies. Hoboken, NJ: John Wiley & Sons.
  2. Barclay, A., & Group, G. (2023, March 01). Alan Barclay. Retrieved March 13, 2023, from https://glycemicindex.com/
  3. Glycemic index and Glycemic Load. (2023, January 03). Retrieved March 13, 2023, from https://lpi.oregonstate.edu/mic/food-beverages/glycemic-index-glycemic-load
  4. Miller, B. J. (2010). The low GI handbook: The New Glucose Revolution Guide to the long-term health benefits of low GI eating. Cambridge: Da Capo Press.
  5. https://www.verywellhealth.com/glycemic-index-chart-for-common-foods-1087476

Dr. Nishtha, a medical doctor holding both an MBBS and an MD in Biochemistry, possesses a profound passion for nutrition and wellness. Her personal journey, marked by significant struggles with physical and mental health, has endowed her with a unique empathy and insight into the challenges countless individuals face. Driven by her own experiences, she leverages her background to offer practical, evidence-backed guidance, empowering others on their paths to achieving holistic well-being. Dr. Nishtha truly believes in the interconnectedness of the mind and body. She emphasizes the significance of understanding this connection as a crucial stride toward attaining balance and happiness in life.

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