Useful concept, imperfect tool.
The Definition
How quickly a food raises blood glucose compared with pure glucose.
The Limits
Portion size (glycemic load), cooking, ripeness and what you eat with it change the response, and some low-GI foods are calorie-dense.
Practical Use
Prefer whole grains, legumes and vegetables; pair carbohydrates with protein and fiber; do not obsess over single numbers.
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