Glycemic Index (GI) and Glycemic Load (GL) help make better carb selections. Still, interestingly, the research does not show that using GI or GL as a tool improves Hemoglobin A1C test result in those with diabetes.
Reviewing and updating GI values become a complicated issue as those smaller research databases get updated.
GI is difficult to calculate. GI is calculated using the glucose area under the curve for 2-hour blood glucose measurements in 10 subjects after a 12-hour fast.
Known GI is available only for 2,700+ foods. The app and website share a massive database of almost 2 million items. There is no way to estimate GI values for the remaining items somehow. Most foods won't have any GI value, only a smaller subset from the database. Adding the GI values to 2,700+ items would be impractical and potentially misleading, since most foods in the database would not have a GI value assigned.
Carb counting is the most effective way to control carbs at meals and snacks, and given that, the tracker does it well. Even though our apps and website, with "BG & Diabetes Tracking" enabled, do not provide Glycemic Index or Glycemic Load, they include the most essential tools for effective diabetes management.
Please see the articles about Using Glycemic Index and about Great Sources of Fiber.