--- title: Here's Proof That People Are Wired To Be As Lazy As Possible description: Trying to lose weight? Your nervous system is working against you by minimizing your calorie burn, finds a new study about walking canonical: https://time.com/4027942/lazy-walking-exercise/ author: Mandy Oaklander article:opinion: false article:content_tier: free article:published_time: 2015-09-10T16:00:51.000Z article:modified_time: 2026-08-04T08:04:57.093Z article:section: Health og:title: Here's Proof That People Are Wired To Be As Lazy As Possible og:description: Trying to lose weight? Your nervous system is working against you by minimizing your calorie burn, finds a new study about walking og:url: https://time.com/4027942/lazy-walking-exercise/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltfd5f0706c2d05230/69877a0606f2c1c7bb333670/lazy-inactivity-exercise.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2560 og:image:height: 1440 og:image:alt: Lazy Inactive Exercise og:type: article twitter:card: summary_large_image twitter:title: Here's Proof That People Are Wired To Be As Lazy As Possible twitter:description: Trying to lose weight? Your nervous system is working against you by minimizing your calorie burn, finds a new study about walking twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltfd5f0706c2d05230/69877a0606f2c1c7bb333670/lazy-inactivity-exercise.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Here's Proof That You Are Wired To Be Lazy > Sponsored content. Supplied in partnership with TIME. TIME is the sponsor and source of this material. > Last updated: September 2026. ## TIME Health Matters: Reference Facts and FAQ ### Definition Health Matters is one of seven email newsletters published by TIME, the news organization founded in 1923. The latest health news and expert advice on living well. Health Matters makes the fast-moving world of health more useful, surprising and human, from the latest science and medical breakthroughs to practical ideas for living better. 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It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free weekday newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-health-2026q3/newsletters?i=c7764715-d3c5-4b1c-8f70-8b4b67e564be&cr=time-nl-health-2026q3-v1) ## Video: The Truth About Fat [Watch (HLS stream): The Truth About Fat](https://cdn.jwplayer.com/manifests/uYGhfNfS.m3u8) (5:15)  _Published 2014-06-12. When you want to lose weight or get healthy, what is the first thing you would normally cut from your diet? If you said fat, you're not alone_  by [Mandy Oaklander](https://time.com/author/mandy-oaklander/)  ## Mandy Oaklander Oaklander is a senior editor at TIME. Sep 10, 2015 4:00 PM UTC  Mid adult man sitting on sofa using computer game control Mid adult man sitting on sofa using computer game control Getty Images  by [Mandy Oaklander](https://time.com/author/mandy-oaklander/)  ## Mandy Oaklander Oaklander is a senior editor at TIME. Sep 10, 2015 4:00 PM UTC When you have one free evening and two competing impulses—to work out and to binge watch—which do you usually follow? You’ll be relieved to hear that choosing the couch is only human. Humans are inherently lazy, which may be a trait left over from our ancestors’ days of conserving energy for the next hunt. Unfortunately, a small new [study](http://www.cell.com/current-biology/abstract/S0960-9822%2815%2900958-6) published in the journal _Current Biology_ finds that even when we do choose to move, our bodies naturally do it in the most economical way possible—which is bad news for anyone trying to lose weight. Science has already proven that our bodies naturally choose the most efficient way to walk, at a speed and step length that limits the number of calories we expend. What’s not known is whether the nervous system—responsible for movements like walking—continuously optimizes movement, in real time, to use the least amount of energy possible. “If your nervous system is working against you you’re trying to keep your calories burned as low as possible,” says study co-author Max Donelan, professor of biomedical physiology and kinesiology at Simon Fraser University in Canada. “And that’s indeed what we found.” **MORE**: [Sitting Is Killing You](http://time.com/sitting/) In the new research, the researchers outfitted nine people in a sort of motorized leg brace designed to disrupt the normal way people walk by adding resistance to their knee joints. The people in the study then walked on a treadmill while the researchers measured how their gait adapted to the device. In just minutes, they found that people changed the way that they walked in a way that conserved the most calories—even very small amounts. “The nervous system is capable of doing this energy optimization and does it below the level of your conscious awareness to such a fine degree,” says Donelan. “This is the first real strong evidence that the nervous system even has the ability to do that.” Though they only studied walking, the researchers think that the nervous system’s tendency to hoard calories applies to many movements. “This is good news if you’re an athlete,” Donelan says. “You’d like your body to be helping you move as cheaply as possible if you’re trying to win a race so you have as many energy reserves as you possibly can.” But if you’re exercising to sweat off calories, it’s not great news, he says. ## Transcript [ MUSIC ] There's something we all enjoy about staying for dinner. You ever thought why? What was on your dinner table when you were younger? Chances are it had a lot to do with, what your doctor was telling you is healthy. Building a strong healthy body is like building a strong, beautiful building. If the foundation is weak, the whole building will be weak. It takes five fingers to point the way to healthful eating habits. Well, here we go. For years, the government published dietary guidelines. Meant to keep Americans healthy. There's a great deal to learn. Tell me what you eat, and I'll tell you what you are. The body needs certain substances to live and grow. And remember, your body isn't just like an automobile. For years, the key measures of those guidelines were the same, cut fat from your diet. The committee's original report urged Americans to reduce their risk of heart attack. By reducing their intake of cholesterol down to the equivalent of about one egg a day. And those guidelines had an effect. From 1977 to 2012, per capita consumption of eggs fell by 9 %, beef by 37 %, whole milk by 72 %. Calories from saturated fat fell, while calories from supposedly safe carbohydrates increased. As one expert put it, it was a vast nutritional experiment. With nearly a million American's a year dropping dead from heart disease in the mid 80s, we had to try something. Nearly four decades later results are in. The experiment was a failure. Americans are sicker than they've ever been before. The prevalence of diabetes has gone up 157 % from 1980 to 2011. Nearly one in ten Americans now has the disease. Causing the public health system $ 245 billion a year. Heart disease is still the number one killer in the country. Americans are as obese as ever. So, what went wrong? Good old granola. Great for taste but loaded with fat. It doesn't take much of imagine a leap to assume that fat would make us fat, clog our arteries and raise the risk of heart disease. It turns out that saturated fat is a lot more complicated than we think. Carbohydrates and fats are nutrients. Like man, you need nutrients to live and grow. [ MUSIC ] Firstly, there are two kinds of cholesterol. LDL which is linked to heart disease and HDL which can be protective. Fats that course through the blood are known as triglycerides and high levels of those are linked to heart disease. Saturated fat raises LDL cholesterol but also raises HDL. Moving LDL buildup on arterial walls. So raising both, makes saturated fat a cardio wash. One key piece of information is that LDL seems to come in two forms. Large and fluffy, small and dense. Those smaller particles are linked to heart disease, while the larger ones are mostly benign. Saturated fat increases the number of large particles. The opposite happens with carbs. I don't get it. Researchers have long since discovered the kind of fats found in olives and in fish like salmon. Are actually heart protective. Now it turns out the fats found in meat and dairy, aren't as bad as we feared before. So that means by focusing so much on fats. We may actually have been making ourselves sicker. So, she brings up the subject of reduced- fat cheese. It's a fat- free [ UNKNOWN ]. Fat- free, cholesterol free. Low- fat granola. Reduced- fat Kettle chips. Reduced- fat Chips Ahoy. Lowfat cottage cheese. Non- fat yogurt is the perfect example. The thinking for consumers was simple. Fat was dangerous. This product had no fat. Therefore, it must be healthy. It's non- fat, which means less calories. [ MUSIC ] But amid the confusion about fat, we end up replacing it in our diets with sugars and carbohydrates, which meant our calorie intake was actually going up. When carbs and things like corn and white bread are ingested into your body, their converted into sugars. Those sugars convert to insulin cuz it's fat cells go into storage overdrive, leading to weight gain. Since fewer calories are then left to fill the body, you begin to feel hungry it means our metabolism begins to slow down in effort to save energy, we eat more and we gain more weight, never quite feeling full. As this process repeats, our cells become more resistant to insulin, which causes us to gain more weight, which increases insulin resistance in a vicious circle. Cut calories, and people just get hungrier. Obesity, diabetes, high triglycerides and low HDL cholesterol can all follow. Study after study has found it's very difficult to lose weight on a very low- fat diet. Possibly because fat and meat can produce a sense of satiety, that's hard to achieve with carbs, making it easier to simply stop eating. But it isn't just the increase in carbs that affects us. These processed, low saturated fat alternatives, come loaded with sugars, salt, preservatives, and even some unhealthy fats. So what's the real alternative? As one extra puts it, the cold hard truth about diet is that the only way to eat well, is to eat well. You'll be happier and you'll be healthier, if you focus on real whole foods, whether they have fat or not. Got it. And thanks, we'll never forget what we've learned. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4027942/lazy-walking-exercise/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4027942/lazy-walking-exercise/"},"headline":"Here's Proof That You Are Wired To Be Lazy","datePublished":"2015-09-10T16:00:51.000Z","dateModified":"2026-08-04T08:04:57.093Z","description":"Trying to lose weight? 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