Glycemic index answers a standardized question
GI compares how rapidly a fixed amount of available carbohydrate from a food raises blood glucose. It can help explain why two carbohydrate foods behave differently, but the test portion may not match the amount people normally eat.
Glycemic load adds quantity
Glycemic load combines a food's GI with the amount of available carbohydrate in a serving. That makes it more sensitive to portion size, which is useful because quantity is a major part of real-world glucose exposure.
Why neither is a complete meal score
- Meals contain multiple foods, not isolated test foods.
- Protein, fat and fiber change digestion.
- Individual responses differ.
- Overall nutrient quality matters beyond the glucose curve.
- A lower-GI food can still be easy to overeat, while a higher-GI food may fit in a balanced meal in a modest portion.
Use GI as context, not a commandment.
The practical hierarchy is usually: overall dietary pattern, portion, fiber and processing first; GI can add detail after that.
Sources & verification
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