Postprandial glycaemic dips predict appetite and energy intake in healthy individuals.
Level 3 - non-randomized controlled study
Prospective multicenter cohort study with continuous glucose monitoring and validation cohort.
PubMed 33846643 · doi:10.1038/s42255-021-00383-x
What was done
Continuous glucose monitors were used to evaluate postprandial glycemic patterns in 1,070 participants across a UK exploratory cohort and a US validation cohort. Participants consumed 8,624 standardized meals followed by 71,715 ad libitum meals. The study compared how postprandial glucose dips 2–3 hours after a meal, peak glucose at 0–2 hours, and 0–2-hour glucose incremental area under the curve (iAUC) predicted self-reported hunger, time to the next meal, and subsequent energy intake.
What was found
Average postprandial glucose dips 2–3 hours post-meal significantly predicted an increase in hunger at 2–3 hours (r = 0.16, P < 0.001), a shorter time until the next meal (r = -0.14, P < 0.001), greater energy intake at 3–4 hours (r = 0.19, P < 0.001), and greater 24-hour energy intake (r = 0.27, P < 0.001). These 2–3-hour dips were better predictors of hunger and intake than 0–2-hour peak glucose or 0–2-hour iAUC. Findings were directionally consistent in the validation cohort.
Why it matters
This study shows that late postprandial glycemic drops (2–3 hours after eating), rather than early glucose peaks, are linked to increased hunger and higher subsequent caloric consumption in free-living adults.
Limits
The correlation coefficients were modest (r values between 0.14 and 0.27), indicating that glucose dips explain only a small portion of the variance in appetite and food intake. The observational design cannot prove causality between glucose dips and subsequent eating behavior, and detailed participant demographic characteristics were not reported in the abstract.
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- supports Large glucose peaks and valleys lead to brain fog, fatigue, irritability, and hunger.