The glycemic index measures how quickly food raises blood sugar, but it’s not the whole story. Research by Zeevi found enormous individual variation in responses to identical foods. GI doesn’t account for portion size, ignores insulin response, varies with preparation and combinations. Watermelon has high GI but low carb per serving; ice cream has moderate GI but isn’t health food.
This companion covers how GI works, its four major limitations, and how to use it wisely as one tool among many. (3 min read)