Staying up late for just one more episode of your favorite series might seem like a minor indulgence, but medical experts caution that it could come with significant health consequences.
Recent findings suggest that sacrificing just over an hour of sleep each night could slowly contribute to weight gain.
The study, which appears in the Annals of Internal Medicine, observed 95 adults who normally slept for seven to eight hours per night.
Participants were asked to delay their bedtime by 90 minutes, resulting in an average sleep loss of 78.4 minutes during the trial.
Surprisingly, those who had less sleep gained an average of one pound over a short six-week period.
Although gaining a pound may seem minor, the researchers caution that continuous mild sleep deprivation can lead to gradual weight gain over the years.
If this pattern continues for an entire year, missing about 80 minutes of sleep each night might cause substantial and noticeable increases in weight.
Marie-Pierre St-Onge from Columbia University, one of the study’s authors, highlighted the implications: “The main takeaway is that sustaining a reduction in sleep, to a duration that is often observed in the general population, leads to weight gain and increases in waist circumference.”
The research also found that less sleep not only affects weight but also reduces physical activity.
During the period of sleep restriction, participants were less active, spending an average of 17 more minutes in sedentary activities.
Men and postmenopausal women experienced an increase of nearly 30 minutes in daily inactivity, exacerbating unhealthy lifestyle choices.
St-Onge elaborated: “Weight gain occurs through an imbalance in energy expenditure and energy intake favoring greater intake relative to expenditure (or conversely low expenditure relative to intake).”
Insufficient sleep also disrupts internal biological processes vital to metabolic and cardiovascular health.
Previous studies have shown increased insulin resistance among women with heightened health risks, raising the potential for type 2 diabetes.
Researchers also identified worrying markers of cellular heart inflammation in subjects enduring prolonged mild sleep deprivation, which can elevate stress hormones, inflammation, and long-term cardiovascular disease risk.
Additionally, a lack of sleep is linked to heightened hunger due to increased levels of ghrelin, the hunger hormone, and decreased levels of leptin, the hormone that signals fullness.
To improve sleep hygiene, St-Onge suggests gradually increasing time in bed to acclimate the body, and advises against habits like eating before sleep or consuming caffeine late in the day.
Ensuring adequate sleep, along with maintaining a balanced diet and regular exercise, is essential in preventing obesity and chronic health conditions.