The glycemic index (GI) measures how quickly a food raises blood glucose after eating, ranking foods on a scale where pure glucose serves as the reference point.
Foods are generally categorized as low GI (below 55), moderate GI (55 to 70), or high GI (above 70), with lower values associated with steadier energy and fewer post-meal crashes. While GI offers a useful starting point, it doesn’t tell the whole story: factors like ripeness, preparation method, and even how quickly a meal is eaten can shift a food’s actual effect on the body.
That’s why many nutrition experts also look at glycemic load (GL), which factors in actual serving size for a more realistic picture of a food’s impact.
Simple strategies like eating protein and vegetables before carbohydrates, pairing carbs with fiber or healthy fats, and choosing whole food carbohydrates over refined ones can all help smooth out glucose spikes and support more consistent energy throughout the day.