Applied Evidence

Inadequate sleep & obesity: Breaking the vicious cycle

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Other sleep characteristics weakly correlated with obesity are sleep variability, timing, efficiency, quality, and daytime napping.8 Sleep variability causes dysregulation of eating patterns, leading to increased food intake. A shift to later sleep and waking times often results in higher consumption of calories after 8 pm13; late-night snacks are a part of this sleep–obesity equation.14

Poor sleep efficiency and quality decreases N3-stage (deep non-REM) sleep, affects the autonomic nervous system, and has been associated with increased abdominal obesity. Daytime napping, which can cause irregular circadian rhythms and sleep schedules, is associated with increased obesity.15 Thus, each component of sleep needs to be assessed to promote optimal regulation of the orexigenic system.

It is a cycle of poor sleep causing obesity and obesity causing poor sleep.

Another study showed that inadequate sleep not only promotes unhealthy lifestyle habits that can lead to obesity but also decreases the ability to lose weight.16 This small study with 10 overweight patients provided its subjects with a controlled caloric intake over 2 weeks. Patients spent two 14-day periods 3 months apart in the laboratory, divided into 2 time-in-bed arms of 8.5 and 5.5 hours per night. Neuroendocrine changes caused by decreased sleep were associated with a significant lean body mass loss while conserving energy-dense fat.16 This study highlights the importance of sleep hygiene counseling when developing a weight-management plan with patients.

Sleep, and its many components, play an integral role in the prevention and treatment of obesity.17 Poor sleep will increase the risk for obesity and hinder its treatment. Therefore, sleep quality and duration are vital components of obesity management.

The sleep–obesity link in children and the elderly

Childhood obesity is linked to several chronic diseases in adulthood, including type 2 diabetes, cardiovascular disease, nonalcoholic fatty liver disease, asthma, and obstructive sleep apnea (OSA).18 According to 2017-2018 NHANES (National Health and Nutrition Examination Surveys) data, obesity (BMI ≥ 95th percentile) prevalence among children and adolescents was reported at 19.3% and severe obesity (BMI ≥ 120% of the 95th percentile) at 6.1%. Pediatric overweight prevalence (≥ 85th percentile and < 95th percentile) was 16.1%.19

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