Values of Meal
Calculating GI Values For Meals
Most of the time we don't eat servings of individual carbohydrate-type foods: we eat meals with a variety of foods containing varying amounts of carbs, as well as protein, fat and fiber. Thus in practice, for optimum blood-glucose management, we need to know the glycemic value of a meal, rather than simply the GI of individual foods.
How to Measure the Glycemic Index Value of Meals
To calculate the GI value of a meal, you need to know two things:
- The total grams of carbohydrates in the
Once you know this data, which is typically obtainable from most food composition or nutrition tables, the GI calculation for a meal is simple:
Calculating GI For a Simple Meal
Calculation = GI X Percentage of carb contribution
Toast: 70 X 81% = 57
The GI value of the meal is 62.
Calculating GI Value of Meals Not Always Possible
If we eat meals with non-standard foods that either do not have a GI rating, or are cooked in ways that have not been tested for GI effect, it is not possible to calculate a precise GI value for them. Even so, by using food composition tables and GI rating lists, it is possible to arrive at ballpark GI values for most meals.
OBESITY, OVERWEIGHT and