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The glycemic index of a given food depends on a number of factors. Should we really quit eating carrots? Or choose plain sugar instead of a baked potato? Knowing the glycemic index of food actually has very little use, because a food is often eaten with other foods. So, for example, while carrots have a very high glycemic index, a normal portion of carrots does not contain a large amount of carbohydrates, so the total glycemic load (a product of glycemic index and the amount of carbohydrates in the portion of food consumed) is not so high. In addition, while there may be good reason to prevent rapid rises in blood sugar, especially for people with diabetes, simpler advice includes avoiding refined carbohydrates and empty calorie foods, and consuming plenty of fruits, vegetables, legumes and whole grains.
In short, you can eat a healthy diet without ever having to consult a glycemic index table. Less insulin means a less dramatic fall in blood sugar and, supposedly, less hunger.
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