A pooled analysis of two rigorously controlled randomized trials has quantified the metabolic consequences of modest sleep curtailment. The data reveal that restricting sleep to 5.5 hours per night—a reduction of just 1.5 hours—was associated with measurable increases in both body weight and waist circumference among adults with elevated cardiometabolic risk.
Beyond weight metrics, the analysis documented significant increases in sedentary time, suggesting that sleep loss disrupts the regulation of physical activity patterns. These findings highlight sleep duration as a more sensitive modulator of metabolic health than previously recognized in high-risk populations.
The controlled, trial-based design strengthens confidence in the causal relationship between sleep restriction and metabolic changes, supporting sleep as a modifiable intervention target in clinical and public health settings.
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