--- title: Your Sleep Habits Could Be Why You're Gaining Weight description: Weight gain might have more to do with how few hours you sleep rather than how much junk food you eat, a new study suggests canonical: https://time.com/4882072/sleep-habits-weight-loss-gain/ author: TIME article:opinion: false article:content_tier: free article:published_time: 2017-08-01T14:01:07.000Z article:modified_time: 2026-02-23T16:48:56.952Z article:section: Health og:title: Your Sleep Habits Could Be Why You're Gaining Weight og:description: Weight gain might have more to do with sleep than how much junk food you eat og:url: https://time.com/4882072/sleep-habits-weight-loss-gain/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt03cb2a355880265d/6988d7f30b72e304446eee06/sleep-weight-gain.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 4689 og:image:height: 2638 og:image:alt: Portrait of woman sleeping in bed og:type: article twitter:card: summary_large_image twitter:title: Your Sleep Habits Could Be Why You're Gaining Weight twitter:description: Weight gain might have more to do with sleep than how much junk food you eat twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt03cb2a355880265d/6988d7f30b72e304446eee06/sleep-weight-gain.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Your Sleep Habits Could Be Why You're Gaining Weight > Sponsored content. 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Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. by [Health.com /Amanda MacMillan](https://time.com/author/health-com-amanda-macmillan/) ## Health.com /Amanda MacMillan Aug 1, 2017 2:01 PM UTC  Relaxation, peace, tranquility, comfort, solitude Relaxation, peace, tranquility, comfort, solitude Getty Images by [Health.com /Amanda MacMillan](https://time.com/author/health-com-amanda-macmillan/) ## Health.com /Amanda MacMillan Aug 1, 2017 2:01 PM UTC People who don’t get the recommended amount of [sleep](http://www.health.com/sleep) each night are more likely to be overweight and have larger waistlines, according to a new study published in _PLOS ONE_. But what the study didn’t find was the real surprise: The results showed no relationship between poor sleep and a less healthy diet. In other words, [skimping on shuteye may fuel weight gain](http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0182195), even if it’s not fueling a penchant for sugary or fatty foods. The study involved 1,615 adults in the United Kingdom who were surveyed about their sleep patterns and their normal diets. They also gave blood samples and had their weight, waist circumference, blood pressure, cholesterol, blood sugar and thyroid function measured. The researchers wanted to see if how long they slept per night would affect these common health measures. **_Health.com:_** [_10 Products That May Help You Sleep_](http://www.health.com/health/gallery/0,,20306893,00.html/?xid=time) For several of these outcomes, that was indeed the case. For example, people who scored about 5.9 hours of sleep a night had an average waist circumference of 37.4 inches and an average [BMI](http://www.health.com/weight-loss/waist-circumference-matters-more-than-bmi) of 28.6, while those who averaged 8.4 hours a night had an average waist circumference of 35.8 inches and an average BMI of 27.1. After the results were adjusting for age, gender, ethnicity, socioeconomic status and smoking status, each additional hour of sleep per night was associated with a 0.3-inch reduction in waist circumference and a nearly half a point decrease in BMI. Shorter sleep was also associated with lower levels of HDL “good” cholesterol. HDL cholesterol is thought to be protective against [cardiovascular disease](http://www.health.com/heart-disease) (although [recent research has questioned this](http://www.health.com/heart-disease/elevated-hdl-cholesterol-heart-disease)) and low levels are considered a risk factor for heart problems, [especially among young people](http://www.health.com/heart-disease/hdl-cholesterol-heart-attack-risk-young-people). The relationship between sleep duration and other health issues was less clear. Although the data suggested that short sleep was linked to higher blood sugar and inflammation and lower [thyroid function](http://www.health.com/thyroid), these findings were not statistically significant. **_Health.com:_**[_The Small Diet Changes That Can Add Up to Big Weight Loss_](http://www.health.com/health/gallery/0,,20628881,00.html/?xid=time) The study also didn’t find a significant link between sleep duration and diet quality, which surprised the researchers. Other studies have suggested that poor sleep can cause people to crave high-fat and high-sugar foods, and it might reduce willpower, so it’s harder to stick to that pledge to stick to salads and lean protein. In a 2016 study in the _European Journal of Clinical Nutrition_, people who slept five and a half hours or less per night consumed an average of [385 extra calories per day](http://www.health.com/weight-loss/sleep-deprived-overeating) than those who slept seven hours or more. Co-author Greg Potter, a researcher at the University of Leeds, says it’s possible the study didn’t have enough people to detect subtle relationships between sleep duration and diet. It’s also possible that people did not accurately report their food choices, he says. Because the participants were only surveyed at one point in time, he adds, the study offers only a snapshot, and it cannot determine how changes in sleep patterns may affect diet changes. But if the study’s findings are accurate—and diet really isn’t a significant factor in the sleep-weight relationship—then there must be another culprit. Although the researchers can’t be sure, they suspect that people who sleep less may have slower metabolisms. “A few (not all) previous experiments have found that if you reduce how long people sleep, some people burn slightly fewer calories at rest,” Potter told _Health_ via email. But regardless of how sleep and weight are linked, Potter says the study supports the idea that sleeping seven to nine hours a night—the amount recommended by the National Sleep Foundation—is not just good for overall health, but good for weight management, as well. “Our findings suggest that people sleeping in this seven to nine hour range are less likely to be overweight than those sleeping less,” he says. **_Health.com:_** [_Best and Worst Foods for Sleep_](http://www.health.com/health/gallery/0,,20628881,00.html/?xid=time) Exactly how much sleep a person needs within that range varies, Potter adds. He recommends that people find a sleep pattern that allows them to wake up naturally in the morning. “If you are regularly waking to an alarm, then you may not be getting as much sleep as you need to optimize your health,” he says. Potter says the study draws an important connection between the rising obesity rate—which has more than doubled worldwide between 1980 and 2014—and the fact that many people report sleeping less today than they used to. “The message we hope that people take away is that prioritizing getting enough sleep may be an important part of minimizing your risk for obesity and the health problems associated with it,” he says, “as is true of consuming a balanced diet and being physically active.” _This_ [_article_](http://www.health.com/sleep/sleep-obesity-connection/?xid=time) _originally appeared on_ [_Health.com_](http://health.com/?xid=time) ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4882072/sleep-habits-weight-loss-gain/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4882072/sleep-habits-weight-loss-gain/"},"headline":"Your Sleep Habits Could Be Why You're Gaining Weight","datePublished":"2017-08-01T14:01:07.000Z","dateModified":"2026-02-23T16:48:56.952Z","description":"Weight gain might have more to do with how few hours you sleep rather than how much junk food you eat, a new study suggests","url":"https://time.com/4882072/sleep-habits-weight-loss-gain/","keywords":["Research","onetime"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt03cb2a355880265d/6988d7f30b72e304446eee06/sleep-weight-gain.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Health.com /Amanda MacMillan","jobTitle":null,"url":"https://time.com/author/health-com-amanda-macmillan/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt03cb2a355880265d/6988d7f30b72e304446eee06/sleep-weight-gain.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Portrait of woman sleeping in bed","caption":"Portrait of woman sleeping in bed","creditText":"Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/research/","name":"Research"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4882072/sleep-habits-weight-loss-gain/","name":"Your Sleep Habits Could Be Why You're Gaining Weight"}}]}] ```