Hormonal
Experimental sleep restriction (4.5 hours/night for 4 nights) impairs insulin signaling in human subcutaneous adipocytes, reducing cellular insulin sensitivity by approximately 30% and shifting the dose-response curve to higher insulin concentrations.
Getting only 4.5 hours of sleep for just four nights significantly impairs how your fat cells respond to insulin, even if you are young and lean. This molecular change reduces your body's ability to manage glucose and lipids efficiently, contributing to insulin resistance. Prioritizing 7-9 hours of sleep is a critical, non-negotiable component of metabolic health, independent of diet or exercise.
The insulin concentration for the half-maximal pAkt–tAkt response was nearly 3-fold higher... and the total area under the receiver-operating characteristic curve of the pAkt–tAkt response was 30% lower... during sleep restriction than during normal sleep.
Why this rating
Randomized crossover design with rigorous control of diet and activity, but limited by small sample size (n=7) and short duration (4 nights).
Source
Impaired Insulin Signaling in Human Adipocytes After Experimental Sleep Restriction
Josiane L. Broussard et al. · Annals of Internal Medicine · 2012
DOI 10.7326/0003-4819-157-8-201210160-00005
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