A similar study of 42,759 male health professionals reported in Diabetes Care also showed that a high glycemic load increased the risk for men to get type 2 diabetes. And the journal Pediatrics reported that teenage boys ate nearly twice as much after a high G.I. meal than after a low one. The really shocking results of G.I. studies are in which foods produce the highest glycemic response. They include many of the starchy foods we eat a lot of, including most bread, most breakfast cereals, and baked potatoes. Low glycemic foods include pasta, oats, barley, beans, and some varieties of rice.
Acidic fruits have low glycemic indexes.
Not by food analysis. One of the problems with the glycemic index is that it's so difficult to figure out the glycemic index of a food. Consequently, the food scientists simply have to test the responses of real people to real food. In tests that take place before breakfast each subject is tested at least three times. Each test, including fingerstick blood samples, is usually taken eight times over a three-hour period.