Thursday, January 26, 2012

Inadequate sleep and obesity

Here is another one on sleep that I saw today in my trawl of the new research.   Nothing that we have not seen before but this is a review that tries to pull together some of the studies:

Does inadequate sleep play a role in vulnerability to obesity?

The prevalence of obesity is increasing rapidly worldwide, which is cause for concern because obesity increases the risk of cardiovascular disease and diabetes, reduces life expectancy, and impairs quality of life. A better understanding of the risk factors for obesity is therefore a critical global health concern, and human biologists can play an important role in identifying these risk factors in various populations. The objective of this review is to present the evidence that inadequate sleep may be a novel risk factor associated with increased vulnerability to obesity and associated cardiometabolic disease. Experimental studies have found that short-term sleep restriction is associated with impaired glucose metabolism, dysregulation of appetite, and increased blood pressure. Observational studies have observed cross-sectional associations between short sleep duration (generally <6 h per night) and increased body mass index or obesity, prevalent diabetes, and prevalent hypertension. Some studies also reported an association between self-reported long sleep duration (generally >8 h per night) and cardiometabolic disease. A few prospective studies have found a significant increased risk of weight gain, incident diabetes, and incident hypertension associated with inadequate sleep. Given the potential link between inadequate sleep and obesity, a critical next step is to identify the social, cultural, and environmental determinants of sleep, which would help to identify vulnerable populations. Future human biology research should consider variation in sleep characteristics among different populations and determine whether the associations between sleep and obesity observed in Western populations persist elsewhere.

There you go.  We are back to the need for getting enough sleep if you want to be lean.

There was another  related study  today:

Sleep Duration and BMI in a Sample of Young Adults

In multivariable-adjusted linear regression models, an hour increase in sleep was associated with a −0.38 (−0.70, −0.048) BMI in men. Men who slept <7 h had a 1.4 unit higher mean BMI (27.9; 95% confidence interval (CI): 26.9, 28.9) than men who slept 7–9 h/day (26.5; 95% CI: 26.1, 27.0). Prevalence estimates of overweight (BMI ≥25) and obesity (BMI ≥30) were also inversely associated with sleep duration among men.

1 comment:

Dan said...

So Im wondering whether sleep deprivation is the cause or the result of obesity.

1. People on diets may sleep longer because their body is trying to conserve energy?

2. Obesity may cause disruptions to your sleeping due to problems breathing etc.

Im sure there are other reasons. I wonder if anyone has explored this issue rather than assuming it is the lack of sleep that contributes to obesity.