A landmark University of Chicago study shows that adding just one extra hour of sleep per night can help maintain a healthy weight. This research strengthens the established connection between sleep duration and body weight control.
Is quality sleep essential for weight management? Mounting evidence suggests yes. Research from 2018 linked short sleep duration to weight gain and loss of lean muscle mass. A 2021 study found that better sleep in infants lowers risks of overweight and obesity later in life.
Published in JAMA Internal Medicine on February 7, 2022, new findings from University of Chicago physicians and nutrition experts confirm the benefits. Their randomized clinical trial focused on overweight adults aged 21-40 who typically slept under 6.5 hours nightly. Through personalized sleep hygiene guidance, the intervention group extended sleep to up to 8.5 hours per night, while a control group did not.
Results? The extended sleep group reduced average daily calorie intake by 270 calories compared to controls.
Remarkably, this calorie reduction occurred without altering eating habits. No dietary restrictions were imposed on food types or portions. Participants followed researchers' sleep advice at home, tracking sleep with wearables—no clinic stays required.
Calorie intake was precisely measured using the gold-standard double-labeled water method. Participants consumed water enriched with stable isotopes (deuterium and oxygen-18). The differential elimination rates—oxygen-18 faster than deuterium—reflect CO2 production, enabling accurate calculations of energy expenditure via mass spectrometry on urine samples.
The four-week study split time evenly: baseline data collection followed by intervention monitoring.
In essence, one to two extra hours of sleep nightly could yield up to 12 kilograms of weight loss over three years with minimal lifestyle changes.
