Low GI
≤ 55
Slow energy release
Medium GI
56–69
Moderate blood sugar spike
High GI
≥ 70
Rapid blood sugar spike
GI values are approximate. Source: International Tables of Glycemic Index.
What is the Glycemic Index?
1
How GI is measured
GI measures how quickly a food raises blood glucose vs pure glucose (GI=100).
2
Why GI matters
High-GI foods cause blood sugar spikes. Low-GI foods provide steady energy.
3
GI vs Glycemic Load
GI × carbs per serving / 100 = Glycemic Load — a more practical measure.
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