Glycemic Index

The glycemic index was created as a way to characterize the effect of carbohydrate-rich foods on blood glucose levels. It is calculated by measuring the effect of 50 grams of carbohydrate over 2 hours in 10 healthy people after overnight fasting.   The index is calculated as relative measurement to the effect of  50 grams of pure glucose itself. 

An index of <100 means that the food has less effect compared to glucose, whereas an index >100 means it is has a greater effect. 


Barnard ND. Nutrition guide for clinicians. 2nd ed. Washington: Physicians Committee for Responsible Medicine; 2009.

Emily McDonald, MD

Hello! I'm Emily, in addition to many other things, I am an allopathic doctor that left the health care system to find a better way to care for people and our planet. I no longer practice the kind of medicine we are used to seeing and using in America today - I am cultivating a practice community based herbalism for social justice and environmental harmony.