A landmark 2015 cohort study from the Weizmann Institute of Science has fundamentally challenged how clinicians and nutritionists approach dietary recommendations. Researchers monitoring 800 adults consuming identical 50-gram portions of white bread discovered a fivefold variation in glucose response—ranging from 15 to 79 mg/dL·h between the lowest and highest responders.
The findings reveal that traditional clinical markers such as body mass index and fasting glucose levels explain only part of the metabolic variation. Instead, individual factors including microbiome composition, sleep quality, and the composition of previously consumed meals independently predicted postprandial glucose responses. These results underscore the growing evidence for personalized nutrition approaches in metabolic health management.
The study suggests that standardized glycemic index labels may not reliably predict individual glucose responses, prompting a reconsideration of universal dietary guidance in clinical practice. Read the full article on GMJ Newsroom.
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