Inadequate sleep &amp; obesity: Breaking the vicious cycle

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doi:doi: 10.12788/jfp.0674

Applied Evidence

Inadequate sleep & obesity: Breaking the vicious cycle

J Fam Pract. 2023 October;72(8):332-338 | doi: 10.12788/jfp.0674

By

Ecler Ercole Jaqua, MD, MBA, FAAFP, AGSF, FACLM, DipABOM

Alaleh Mapar, DO

Mai-Linh N. Tran, MD, FAAFP, DipABLM, DipABOM

Van Nguyen, DO, FAAFP, DipABOM

Poor sleep negatively affects hormones that govern the food reward system and can interfere with weight-loss programs. Obesity in turn restricts sleep. Which treatments have shown promise?

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PRACTICE RECOMMENDATIONS

› Consider cognitive behaviorial therapy for insomnia (CBT-I) first-line treatment for insomnia. A

› Carefully review patients’ medication lists, as many pharmaceuticals can affect weight and sleep. C

Strength of recommendation (SOR)
A Good-quality patient-oriented evidence
B Inconsistent or limited-quality patient-oriented evidence
C Consensus, usual practice, opinion, disease-oriented evidence, case series

References

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Sleep is fundamental to overall health and longevity, with the average person spending about one-third of their life sleeping.¹ Adequate sleep is critical for optimal cognition, memory consolidation, mood regulation, metabolism, appetite regulation, and immune and hormone functioning. According to the American Academy of Sleep Medicine and the Sleep Research Society, adults should sleep at least 7 hours per night on a regular basis “to promote optimal health.”² Yet, between 2013 and 2020, only about 65% of adults in the United States were meeting this amount.³ Insufficient sleep is associated with an increased risk for chronic health conditions, including obesity, diabetes, cardiovascular diseases, and even premature death.⁴

In a population-based longitudinal study of sleep disorders, short sleep duration was associated with increased body mass index (BMI), low blood levels of leptin, and high ghrelin levels.⁵ In addition to physical impairments, poor sleep can impair cognitive performance and lead to vehicular accidents and increased accidents at work.⁴ The potential economic impact that this may have is significant, and includes increased costs and loss of productivity in the workplace.⁶

Many factors may contribute to short sleep duration: environment, mental and physical condition, and social influences such as occupation, family responsibilities, travel, group activities, and personal care. Furthermore, the rapidly evolving and developing media, communication, and entertainment industries are already strongly implicated in poor sleep quality and quantity, both contributing to excessive daytime sleepiness.⁷ Poor sleep quality is most notable in modern societies, and it correlates with the increasing prevalence of obesity, likely due to sleep’s effect on food consumption and physical activity.⁸ Optimizing a person’s sleep will improve overall health and longevity by inhibiting the development of chronic disease.

How insufficient sleep raises the risk for obesity

Not only is sleep beneficial for brain health, memory, learning, and growth, its effect on food consumption and physical activity likely correlates with the increased prevalence of obesity in modern society. Yet the optimal amount of sleep is controversial, and current recommendations of 7 or more hours of sleep per night for adults are derived from expert panels only.² The recommended sleep duration for children is longer, and it varies by age.⁹ The quality of sleep and its impact on neuroendocrine hormones, not just the quantity of sleep, needs to be factored into these recommendations.

Sleep restriction activates the orexigenic system via the hormones leptin and ghrelin. These hormones control the food reward system, essentially increasing hunger and food intake. Leptin, created by white adipose tissue, is responsible for satiety and decreased food consumption.¹⁰ Ghrelin, made by oxyntic glands in the stomach, is responsible for the sensation of hunger.

Poor sleep will increase the risk for obesity and hinder its treatment. Therefore, sleep quality and duration are vital components of obesity management.

In a 2004 study by Spiegel et al,¹¹ leptin and ghrelin levels were measured during 2 days of sleep restriction (4 hours in bed) and sleep extension (10 hours in bed). Sleep restriction was associated with a decrease in leptin levels and an increase in ghrelin levels. The researchers reported that participants experienced an increase in hunger and appetite—especially for calorie-dense foods with high carbohydrate content.

Although research design has limitations with predominantly self-reported sleep data, studies have shown that short sleep time leads to increased food intake by increasing hunger signals and craving of unhealthy foods, and by providing more opportunities to eat while awake. It also may lead to decreased physical activity, creating a sedentary lifestyle that further encourages obesity.⁸ Reduced sleep is even correlated to decreased efficacy of weight-loss treatments.¹²

Continue to: Other sleep characteristics weakly correlated with obesity