Ayurveda

Importance of Glycemic Index

of Different Food and Values

Introduction:

The glycemic index (GI) is a number from 0 to 100 assigned to a food, with pure glucose arbitrarily given the value of 100, which represents the relative rise in the blood glucose level two hours after consuming that food. The GI of a specific food depends primarily on the quantity and type of carbohydrate it contains; but also is affected by the amount of entrapment of the carbohydrate molecules within the food, the fat and protein content of the food, the amount of organic acids (or their salts) in the food, and whether it is cooked and if so how it is cooked. GI tables are available that list many types of foods with their GIs. A food is considered to have a low GI if it is 55 or less; high GI if 70 or more; and mid-range GI if 56 to 69.

The GI is useful for quantifying the relative rapidity with which the body breaks down carbohydrates. It takes into account only the available carbohydrate (total carbohydrate minus fiber) in a food. Glycemic index does not predict an individual's glycemic response to a food, but can be used as a tool to assess the insulin response burden of a food, averaged across a studied population. Individual responses vary greatly.

The glycemic index is usually applied in the context of the quantity of the food and the amount of carbohydrate in the food that is actually consumed. A related measure, the glycemic load (GL), factors this in by multiplying the glycemic index of the food in question by the carbohydrate content of the actual serving.

Measurement

The glycemic index of a food is defined as the incremental area under the two-hour blood glucose response curve (AUC) following a 12-hour fast and ingestion of a food with a certain quantity of available carbohydrate (usually 50 g). The AUC of the test food is divided by the AUC of the standard (either glucose or white bread, giving two different definitions) and multiplied by 100. The average GI value is calculated from data collected in 10 human subjects. Both the standard and test food must contain an equal amount of available carbohydrate. The result gives a relative ranking for each tested food.

Foods with carbohydrates that break down quickly during digestion and release glucose rapidly into the bloodstream tend to have a high GI; foods with carbohydrates that break down more slowly, releasing glucose more gradually into the bloodstream, tend to have a low GI.

A lower Glycemic index suggests slower rates of digestion and absorption of the foods' carbohydrates and can also indicate greater extraction from the liver and periphery of the products of carbohydrate digestion.

FOOD Glycemic index (glucose = 100)
HIGH-CARBOHYDRATE FOODS  
White wheat bread* 75 ± 2
Whole wheat/whole meal bread 74 ± 2
Specialty grain bread 53 ± 2
Unleavened wheat bread 70 ± 5
Wheat roti 62 ± 3
Chapatti 52 ± 4
Corn tortilla 46 ± 4
White rice, boiled* 73 ± 4
Brown rice, boiled 68 ± 4
Barley 28 ± 2
Sweet corn 52 ± 5
Spaghetti, white 49 ± 2
Spaghetti, whole meal 48 ± 5
Rice noodles† 53 ± 7
Udon noodles 55 ± 7
Couscous† 65 ± 4
   
BREAKFAST CEREALS  
Cornflakes 81 ± 6
Wheat flake biscuits 69 ± 2
Porridge, rolled oats 55 ± 2
Instant oat porridge 79 ± 3
Rice porridge/congee 78 ± 9
Millet porridge 67 ± 5
Muesli 57 ± 2
   
FRUIT AND FRUIT PRODUCTS  
Apple, raw† 36 ± 2
Orange, raw† 43 ± 3
Banana, raw† 51 ± 3
Pineapple, raw 59 ± 8
Mango, raw† 51 ± 5
Watermelon, raw 76 ± 4
Dates, raw 42 ± 4
Peaches, canned† 43 ± 5
Strawberry jam/jelly 49 ± 3
Apple juice 41 ± 2
Orange juice 50 ± 2
   
VEGETABLES  
Potato, boiled 78 ± 4
Potato, instant mash 87 ± 3
Potato, french fries 63 ± 5
Carrots, boiled 39 ± 4
Sweet potato, boiled 63 ± 6
Pumpkin, boiled 64 ± 7
Plantain/green banana 55 ± 6
Taro, boiled 53 ± 2
Vegetable soup 48 ± 5
   
DAIRY PRODUCTS AND ALTERNATIVES  
Milk, full fat 39 ± 3
Milk, skim 37 ± 4
Ice cream 51 ± 3
Yogurt, fruit 41 ± 2
Soy milk 34 ± 4
Rice milk 86 ± 7
   
LEGUMES  
Chickpeas 28 ± 9
Kidney beans 24 ± 4
Lentils 32 ± 5
Soya beans 16 ± 1
   
SNACK PRODUCTS  
Chocolate 40 ± 3
Popcorn 65 ± 5
Potato crisps 56 ± 3
Soft drink/soda 59 ± 3
Rice crackers/crisps 87 ± 2
   
SUGARS  
Fructose 15 ± 4
Sucrose 65 ± 4
Glucose 103 ± 3
Honey 61 ± 3

26-Oct-2019

More by :  Dr. Shiv Dwivedi

Top | Ayurveda

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