Sleeping less than the recommended amount is not just about feeling tired. A recent study from Columbia University demonstrates that even a moderate reduction in sleep, about 80 minutes per night for six weeks, can cause measurable weight gain. The research adds new evidence to the debate on how modern lifestyles affect obesity risk and metabolic diseases.
A controlled experiment on 95 adults at cardiovascular risk
The team led by Marie-Pierre St-Onge, professor of nutritional medicine at Columbia University, recruited 95 adults who typically slept at least seven hours per night and had cardiovascular and metabolic risk factors. For six weeks, participants delayed their bedtime by 90 minutes, reducing sleep duration by about 80 minutes compared to their norm. A control period of another six weeks involved maintaining usual sleep habits. During both phases, researchers measured weight, waist circumference, body composition, and fasting blood levels of appetite-regulating hormones.
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The results are clear: during the sleep restriction period, participants' average weight increased by about 0.45 kg compared to the normal sleep period. Moreover, average sitting time increased by 17 minutes per day, with a peak of nearly 30 minutes in men and postmenopausal women. This suggests that sleep deprivation alters not only energy balance but also sedentary behavior, amplifying the effect on weight.
Hormones and behavior: the ambiguous role of leptin
Contrary to previous studies on severe sleep deprivation, which showed a decrease in leptin (the appetite-suppressing hormone), here leptin levels were higher during the restriction period. This means that the overeating mechanism driven by hormonal imbalances may not be the only culprit. Researchers hypothesize that increased sedentary time and reduced physical activity play a key role, leading to weight gain even without increased calorie intake.
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Health implications: insulin resistance and inflammation
A prior study on the same participants, limited to 38 women, already showed that sleep reduction increased insulin resistance, a risk factor for type 2 diabetes, especially in postmenopausal women. Another analysis found that mild sleep deprivation makes immune cells more likely to migrate to inflammatory sites, raising cardiovascular risk. These converging data demonstrate that short sleep is not a harmless habit but a true modifiable risk factor.
As Professor St-Onge stated: "All our findings suggest that insufficient sleep increases the risk of obesity-related conditions like type 2 diabetes and heart disease." The next step, she explains, is to understand what health benefits chronically sleep-deprived people can gain by improving sleep duration.
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According to estimates, about 30% of adults suffer from chronic sleep deprivation. This Columbia University study serves as a wake-up call: even small sleep deficits, if accumulated over time, can translate into clinically significant weight gain and worsening metabolic profiles. Further research is needed to clarify the underlying mechanisms and develop targeted interventions.
For more information on the basics of sleep and health, you can consult the Wikipedia entry on sleep deprivation.
Source: https://www.wired.com/story/even-mild-sleep-deprivation-may-lead-to-weight-gain
