New Insights: Glycemic Index
The glycemic index may help predict the blood sugar effects of a food, but it doesn't tell the whole story, especially when combining foods.
Guessing the effects of a meal on your blood sugar isn't easy, even if you use the glycemic index. That's a ranking of how much standardized (50-gram available carbohydrate) portions of individual foods increase blood sugar. But, people typically eat a mix of different foods at any one time, which makes using the glycemic index less straightforward.