The data is striking. When 800 adults consumed the same 50-gram portion of white bread under controlled conditions, their glucose responses ranged from 15 to 79 mg/dL·h—a 5.3-fold difference. This variability cannot be attributed to weight or baseline blood sugar levels alone.
The 2015 Weizmann Institute study identified multiple independent predictors of individual glucose spikes: microbiome composition, sleep duration the night before testing, and the timing and composition of previously consumed meals all significantly influenced metabolic response. Standard clinical variables accounted for only a fraction of the observed variation, suggesting that personalized assessment is essential for accurate metabolic prediction.
These findings have important implications for dietary counseling and the validity of universal nutritional recommendations in clinical settings. Read the full article on GMJ Newsroom.
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