Stanford study links obesity to hormonal changes from lack of sleep

December 06, 2004

Note: The embargo on this release has been lifted ahead of schedule.

STANFORD, Calif. - The less you sleep, the more you may gain. So say Stanford University School of Medicine researchers, who found in a recent study that sleep loss leads to higher levels of a hormone that triggers appetite, lower levels of a hormone that tells your body it's full and an increased body mass index.

The findings not only add to the growing body of evidence showing that sleep duration may be an important regulator of body weight and metabolism, but they also document for the first time the relationship between sleep and these hormones in the general population, tracking how hormonal changes are consistent with obesity.

The paper by Emmanuel Mignot, MD, PhD, associate professor of psychiatry and behavioral sciences, and colleagues at Stanford and the University of Wisconsin is published in the Dec. 6 online issue of Public Library of Science.

"Our results demonstrate an important relationship between sleep and metabolic hormones," the researchers noted in the paper. "In Western societies, where chronic sleep restriction is common and food is widely available, changes in appetite regulatory hormones with sleep curtailment may contribute to obesity."

Past studies have indicated an association between sleep loss and increased body mass index, or BMI. A study presented last month at a meeting of the North American Association for the Study of Obesity, for example, found that people who sleep two to four hours a night were 73 percent more likely to be obese than normal sleepers.

Researchers believe that sleep loss impacts several hormones related to appetite and food intake, and two such hormones - ghrelin and leptin - are thought to play a role in the interaction between short sleep duration and high BMI.

Ghrelin, which was discovered five years ago and is primarily produced by the stomach, triggers appetite in humans: the more ghrelin you have, the more you want to eat.

Leptin, a hormone produced by fat cells, is a signal indicating insufficient metabolic reserve and the need for consuming more calories. Low leptin levels are a signal for starvation and increased appetite.

While the hormone/sleep connection has been shown under highly controlled laboratory circumstances in past studies, Mignot and his team aimed to explore the connection in a general population sample.

During the study, the researchers examined the sleep patterns of 1,024 volunteers from the Wisconsin Sleep Cohort Study, a population-based longitudinal study of sleep disorders that began in 1989. Participants between the ages of 30 and 60 underwent nocturnal polysomnography (a test during which a number of physiologic variables are measured and recorded during sleep) and blood sampling once every four years. They also reported on their sleep habits every five years through questionnaires and six-day sleep diaries.

The researchers' data showed a 14.9 percent increase in ghrelin and a 15.5 percent decrease in leptin in people who consistently slept for five hours compared with those who slept for eight. Mignot said the results were consistent regardless of participants' gender, BMI or eating and exercise habits. "The effect must be very strong to appear in [this entire] population," he said.

"It was quite amazing that a hormone can track a person's self-reported amount of sleep so well," he added. "To my knowledge, this is the first time that a peripheral marker in the blood is shown to correlate with habitual sleep amounts in a general, normally behaving population."

The researchers also found that in people sleeping less than eight hours (74.4 percent of the sample), increased BMI was proportional to decreased sleep. They reported that a 3.6 percent increase in BMI corresponded to an average nightly sleep duration decrease from eight hours to five hours.

While it remains unconfirmed whether observed changes in ghrelin and leptin are sufficient to produce increases in body weight, Mignot said he believed they were likely to do so because all the effects were in the right direction and of the expected magnitude.

Mignot said more studies on the direct effect of sleep loss on food intake, energy expenditure and obesity are needed. Altering sleep duration may prove to be an important way to prevent and treat obesity. Mignot is working on setting up a trial to study this approach.
-end-
The National Institutes of Health funded Mignot's work. His co-authors on the paper are Shahrad Taheri, MD, PhD, who conducted the research while at Stanford and is now at the University of Bristol; research associate Ling Lin, PhD; and Diane Austin and Terry Young, PhD, with the University of Wisconsin.

Stanford University Medical Center integrates research, medical education and patient care at its three institutions - Stanford University School of Medicine, Stanford Hospital & Clinics and Lucile Packard Children's Hospital at Stanford. For more information, please visit the Web site of the medical center's Office of Communication & Public Affairs at http://mednews.stanford.edu.

Stanford University Medical Center

Related Obesity Articles from Brightsurf:

11 years of data add to the evidence for using testosterone therapy to treat obesity, including as an alternative to obesity surgery
New research covering 11 years of data presented at this year's European and International Congress on Obesity (ECOICO 2020) show that, in obese men suffering from hypogonadism (low testosterone), treatment with testosterone injections lowers their weight and improves a wide range of other metabolic parameters.

Overlap between immunology of COVID-19 and obesity could explain the increased risk of death in people living with obesity, and also older patients
Data presented in a special COVID-19 session at the European and International Congress on Obesity (ECOICO 2020) suggests that there are overlaps between the immunological disturbances found in both COVID-19 disease and patients with obesity, which could explain the increased disease severity and mortality risk faced by obese patients, and also elderly patients, who are infected by the SARS-CoV-2 virus that causes COVID-19 disease.

New obesity guideline: Address root causes as foundation of obesity management
besity management should focus on outcomes that patients consider to be important, not weight loss alone, and include a holistic approach that addresses the root causes of obesity, according to a new clinical practice guideline published in CMAJ (Canadian Medical Association Journal) http://www.cmaj.ca/lookup/doi/10.1503/cmaj.191707.

Changing the debate around obesity
The UK's National Health Service (NHS) needs to do more to address the ingrained stigma and discrimination faced by people with obesity, says a leading health psychologist.

Study links longer exposure to obesity and earlier development of obesity to increased risk of type 2 diabetes
Cumulative exposure to obesity could be at least as important as actually being obese in terms of risk of developing type 2 diabetes (T2D), concludes new research published in Diabetologia (the journal of the European Association for the Study of Diabetes [EASD]).

How much do obesity and addictions overlap?
A large analysis of personality studies has found that people with obesity behave somewhat like people with addictions to alcohol or drugs.

Should obesity be recognized as a disease?
With obesity now affecting almost a third (29%) of the population in England, and expected to rise to 35% by 2030, should we now recognize it as a disease?

Is obesity associated with risk of pediatric MS?
A single-center study of 453 children in Germany with multiple sclerosis (MS) investigated the association of obesity with pediatric MS risk and with the response of first-line therapy in children with MS.

Women with obesity prior to conception are more likely to have children with obesity
A systematic review and meta-analysis identified significantly increased odds of child obesity when mothers have obesity before conception, according to a study published June 11, 2019 in the open-access journal PLOS Medicine by Nicola Heslehurst of Newcastle University in the UK, and colleagues.

Obesity medicine association announces major updates to its adult obesity algorithm
The Obesity Medicine Association (OMA) announced the immediate availability of the 2019 OMA Adult Obesity Algorithm, with new information for clinicians including the relationship between Obesity and Cardiovascular Disease, Diabetes Mellitus, Dyslipidemia, and Cancer; information on investigational Anti-Obesity Pharmacotherapy; treatments for Lipodystrophy; and Pharmacokinetics and Obesity.

Read More: Obesity News and Obesity Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.