Research
Mixed
Standardized Glycemic Index (GI) measurement requires a minimum of 10 healthy subjects and 2-3 repeated trials of the reference food (glucose) to achieve statistically valid precision.
If you are evaluating a food's Glycemic Index, ensure the data comes from a study with at least 10 healthy participants and uses glucose as a standardized reference. Single-subject or anecdotal GI claims are statistically unreliable.
StrongSupportsHIGH confidence
The inclusion of ten subjects provides a reasonable degree of power and precision for most purposes of measuring GI... We recommend repeating the trials of the reference food at least once, to obtain at least two values, in each subject.
Why this rating
Based on interlaboratory studies, simulation analyses, and consensus of expert panel.
Source
Glycaemic index methodology
Fred Brouns et al. · Nutrition Research Reviews · 2005
DOI 10.1079/nrr2005100
narrative_reviewCited 1,046×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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