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Sleep loss rewires the brain for cravings and weight gain – a neurologist explains the science behind the cycle

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Sleep loss
Getting enough sleep is one of the most effective ways to restore metabolic balance in the brain and body.
SimpleImages/Moment via Getty Images

Joanna Fong-Isariyawongse, University of Pittsburgh

You stayed up too late scrolling through your phone, answering emails or watching just one more episode. The next morning, you feel groggy and irritable. That sugary pastry or greasy breakfast sandwich suddenly looks more appealing than your usual yogurt and berries. By the afternoon, chips or candy from the break room call your name. This isn’t just about willpower. Your brain, short on rest, is nudging you toward quick, high-calorie fixes.

There is a reason why this cycle repeats itself so predictably. Research shows that insufficient sleep disrupts hunger signals, weakens self-control, impairs glucose metabolism and increases your risk of weight gain. These changes can occur rapidly, even after a single night of poor sleep, and can become more harmful over time if left unaddressed.

I am a neurologist specializing in sleep science and its impact on health.

Sleep deprivation affects millions. According to the Centers for Disease Control and Prevention, more than one-third of U.S. adults regularly get less than seven hours of sleep per night. Nearly three-quarters of adolescents fall short of the recommended 8-10 hours sleep during the school week.

While anyone can suffer from sleep loss, essential workers and first responders, including nurses, firefighters and emergency personnel, are especially vulnerable due to night shifts and rotating schedules. These patterns disrupt the body’s internal clock and are linked to increased cravings, poor eating habits and elevated risks for obesity and metabolic disease. Fortunately, even a few nights of consistent, high-quality sleep can help rebalance key systems and start to reverse some of these effects.

How sleep deficits disrupt hunger hormones

Your body regulates hunger through a hormonal feedback loop involving two key hormones.

Ghrelin, produced primarily in the stomach, signals that you are hungry, while leptin, which is produced in the fat cells, tells your brain that you are full. Even one night of restricted sleep increases the release of ghrelin and decreases leptin, which leads to greater hunger and reduced satisfaction after eating. This shift is driven by changes in how the body regulates hunger and stress. Your brain becomes less responsive to fullness signals, while at the same time ramping up stress hormones that can increase cravings and appetite.

These changes are not subtle. In controlled lab studies, healthy adults reported increased hunger and stronger cravings for calorie-dense foods after sleeping only four to five hours. The effect worsens with ongoing sleep deficits, which can lead to a chronically elevated appetite.

Sleep is as important as diet and exercise in maintaining a healthy weight.

Why the brain shifts into reward mode

Sleep loss changes how your brain evaluates food.

Imaging studies show that after just one night of sleep deprivation, the prefrontal cortex, which is responsible for decision-making and impulse control, has reduced activity. At the same time, reward-related areas such as the amygdala and the nucleus accumbens, a part of the brain that drives motivation and reward-seeking, become more reactive to tempting food cues.

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In simple terms, your brain becomes more tempted by junk food and less capable of resisting it. Participants in sleep deprivation studies not only rated high-calorie foods as more desirable but were also more likely to choose them, regardless of how hungry they actually felt.

Your metabolism slows, leading to increased fat storage

Sleep is also critical for blood sugar control.

When you’re well rested, your body efficiently uses insulin to move sugar out of your bloodstream and into your cells for energy. But even one night of partial sleep can reduce insulin sensitivity by up to 25%, leaving more sugar circulating in your blood.

If your body can’t process sugar effectively, it’s more likely to convert it into fat. This contributes to weight gain, especially around the abdomen. Over time, poor sleep is associated with higher risk for Type 2 diabetes and metabolic syndrome, a group of health issues such as high blood pressure, belly fat and high blood sugar that raise the risk for heart disease and diabetes.

On top of this, sleep loss raises cortisol, your body’s main stress hormone. Elevated cortisol encourages fat storage, especially in the abdominal region, and can further disrupt appetite regulation.

Sleep is your metabolic reset button

In a culture that glorifies hustle and late nights, sleep is often treated as optional. But your body doesn’t see it that way. Sleep is not downtime. It is active, essential repair. It is when your brain recalibrates hunger and reward signals, your hormones reset and your metabolism stabilizes.

Just one or two nights of quality sleep can begin to undo the damage from prior sleep loss and restore your body’s natural balance.

So the next time you find yourself reaching for junk food after a short night, recognize that your biology is not failing you. It is reacting to stress and fatigue. The most effective way to restore balance isn’t a crash diet or caffeine. It’s sleep.

Sleep is not a luxury. It is your most powerful tool for appetite control, energy regulation and long-term health.

Joanna Fong-Isariyawongse, Associate Professor of Neurology, University of Pittsburgh

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This article is republished from The Conversation under a Creative Commons license. Read the original article.

financial wellness

Life insurance is on the to-do list. Right under cleaning out the garage.

No matter how you define “adulting,” getting life insurance tends to be one part of the to-do list that keeps getting set on a procrastination loop. New survey data backs that up: there are plenty of other tasks adults would rather focus on first.

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Life insurance is on the to-do list. Right under cleaning out the garage.

(Sheeka Sanahori) Being an adult comes with a never-ending list of responsibilities: Cook dinner. Scrub the bathroom. File taxes. The tasks grow even longer when sharing a household with a partner, building a family, or taking care of others. No matter how you define “adulting,” getting life insurance tends to be one part of the to-do list that keeps getting set on a procrastination loop.

New survey data backs that up: there are plenty of other tasks adults would rather focus on first.

The Adulting Task Americans Keep Avoiding

According to the 2026 Life Happens Life Insurance Survey, a financial literacy nonprofit organization, 39% of U.S. adults would rather clean out their email inbox than figure out their life insurance needs. Another 31% would rather clean out the garage or basement. One in five U.S. adults would be willing to sit on hold with customer service for three hours before life insurance planning. Even though many adults have it somewhere on their list, nearly half (46%) say they’ll either deal with it later or not at all.

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They Know It Matters

Nearly a third of adults have already figured out a life insurance plan, and they feel good about their decision. Others are feeling more conflicted: 14% have a policy, but they’re not sure if they have enough. Another 12% say they either don’t know where to start or they think it’ll be too expensive.

It’s no wonder people are putting it off: Navigating a new-to-them form of financial planning can come with a lot of complicated emotions. Four in 10 feel either overwhelmed, anxious, or some combination of both. Sixteen percent of U.S. adults feel guilty for putting it off, but when the outcome is more procrastination, that feeling lingers.

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Why Later Keeps Winning

If you’ve ever faced an important decision without having enough information to make an informed choice, you know how stressful it can be. While the generations have different takes on making major decisions with a gut feeling or “pure vibes,” most of the time, people want to feel like they’re making an informed choice. Forty-five percent of U.S. adults say cost concerns, confusion or procrastination are the main reasons they have delayed or would delay looking into life insurance. For more than one in five, the plan is to seriously look at it when they feel more financially stable. For 12%, they say they’ll do it when they’re older.

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Men tend to feel more confident about their life insurance decisions to date; 53% of men vs. 41% of women feel confident their family would be financially protected.

The First Step Feels Bigger Than It Is

Learning more about life insurance, how it’s priced and how it works could help get many consumers out of their procrastination loop. A quarter of people say they’d make a decision if they learned it was easier to get than they previously thought. Thirty percent would make the purchase if they learned it was more affordable than they believed it to be. Others need an experienced professional to talk to or an online calculator tool to give them guidance.

Methodology: Life Happens commissioned Atomik Research to conduct an online survey of 2,000 adults, including 700 Gen Z respondents, 700 millennials, and 600 Gen X respondents throughout the United States. The margin of error for the overall sample is +/- 2 percentage points and +/- 4 percentage points for each generational sample, with a confidence level of 95 percent. Fieldwork took place between July 14 and July 20, 2026. Atomik Research, part of 4media group, is a creative market research agency.

Photo courtesy of Shutterstock (couple using computer) collect?v=1&tid=UA 482330 7&cid=1955551e 1975 5e52 0cdb 8516071094cd&sc=start&t=pageview&dl=http%3A%2F%2Ftrack.familyfeatures.com%2F17983%2F10524&dt=LIFE INSURANCE IS ON THE TO DO LIST. RIGHT UNDER CLEANING OUT THE GARAGE track

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fitness

Design Your Home Workout Space Around the Way You Actually Exercise

Use these tips to create a home workout space you’ll keep using after the novelty wears off.

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Design Your Home Workout Space Around the Way You Actually Exercise

Design Your Home Workout Space Around the Way You Actually Exercise

(Feature Impact) It’s a tale as old as treadmills: You buy a new exercise machine with the best of intentions, only for it to become an expensive laundry rack that makes you feel guilty every time you glance over at it. When it comes to making lifestyle changes, the key is not to overhaul your whole routine at once, but to figure out what habits match your lifestyle, personality and passions.

Use these tips to create a home workout space you’ll keep using after the novelty wears off.

Figure Out What Exercises You Enjoy

Before you commit to a big equipment purchase, think about what kinds of exercise feel natural and enjoyable (and which ones make you groan).

If you love running, a treadmill may be worth the space it takes up. However, a rack of dumbbells might just wind up collecting dust if you hate lifting weights. Yoga or dance enthusiasts may prefer to design a more studio-like home gym, while bodyweight strength trainers could be happy with a pull-up bar in the doorway and a mat to do planks on. Consider joining a workout class or gym for a month or two to try different kinds of exercises and machines so you’ll have a better idea of what’s worth investing in permanently.

Evaluate the Space You Have

A good home workout area needs to work around the physical realities of your house or apartment. If you have a whole room or finished basement to dedicate to the cause, this won’t constrain you too much. If you’re working with a corner of your home office, bedroom or garage, saving space becomes a more critical factor.

In these cases, it all comes down to priorities. If you only have room for one piece of bigger equipment, get the one you know you’ll actually use, whether that’s an elliptical, strength machine, standing bicycle or rowing machine. Then build out your collection with other items that can be easily moved and stored, like resistance bands and small weights or dumbbells.

Start Small and Expand as Needed

Don’t fall into the trap of thinking you need to have everything before you can get started. It’s often better to build out your workout space slowly – get a few things at a time, see what you use regularly and figure out what you might be missing along the way. Maybe you realize you enjoy lifting weights and keep wishing you had heavier ones, signaling a need to upgrade.

Add Some Atmosphere

Dark, dismal home gyms are more likely to make your workout feel like a punishment instead of a part of your day worth looking forward to. Creating a space you enjoy being in is just as important as choosing a workout you enjoy doing.

For you, that might look like choosing an area of the home with plenty of natural lighting to make you feel more awake – or adding string lights and color-changing wall sconces for a relaxing yoga session. Maybe it means adding art on the walls or a floor-to-ceiling mirror so you can check your form. A large rubber floormat with a cheerful design, a sound system to play your favorite hype songs or a daily calendar of motivational quotes could be the magic ingredient to get you into the right mindset so you can crush your workout. As long as it works for you, anything goes.

For more tips on home design that fits your life, visit eLivingtoday.com.

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Photo courtesy of Unsplash collect?v=1&tid=UA 482330 7&cid=1955551e 1975 5e52 0cdb 8516071094cd&sc=start&t=pageview&dl=http%3A%2F%2Ftrack.familyfeatures track

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health and wellness

Lactose intolerance is actually the human norm – but racism, the US government and business interests have made it into a condition

Lactose intolerance is the global human norm, but Western dietary standards, government policies and commercial interests helped frame it as a medical deficiency.

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Close-up of spilled glass bottle of milk. Lactose intolerance is actually the human norm
The majority of the world is unable to process the lactose in milk without uncomfortable symptoms. Olga Miltsova/iStock via Getty Images Plus

Hilary Smith, University of Denver

Lactose intolerance makes drinking milk or eating ice cream a literal pain. For some people, eating a dairy treat can lead to bloating, nausea and diarrhea. You might’ve experienced its effects yourself. If so, you may think of lactose intolerance as a defect rather than the norm.

But did you know that most people in the world today are lactose intolerant – and that the condition itself was invented in the 1960s?

“Surely you mean discovered, not invented,” I hear you saying. I don’t. As a historian who has traced the origins of nutrition-science ideas, I have chosen the word “invented” on purpose.

Inventing lactose intolerance

Variations in people’s ability to digest lactose first came to scientists’ attention after American dairy producers found a way to rid themselves of a postwar milk surplus. To offload what they couldn’t sell, they looked to the government to intervene. And it did, buying the excess and embedding it in school lunches and other places with publicly funded meals.

Suddenly, many people who had not habitually drunk milk were consuming it regularly, including not only some Americans but also people overseas. Part of that same milk surplus found its way into school lunches in places such as Japan and Taiwan in the 1950s as the American government began to sell milk to allies during the Cold War.

Black and white photo of children in uniform eating lunch at their desks
Longshou Elementary School students in Taiwan in 1964 eat an American aid lunch for the first time. National Archives of Taiwan, CC BY-NC-SA

Many of the groups drinking milk regularly for the first time did not like it. In fact, it made them feel sick. Intrigued, scientists set up experiments to figure out why. In a 1966 study comparing how Black and white people incarcerated in Baltimore metabolized lactose, researchers found that Black participants had lower levels of lactase – the enzyme that breaks down lactose – in their guts.

To the white scientists conducting this study, the trouble that the Black prisoners had digesting milk looked like an “inborn error of metabolism.” They assumed that the normal human state was lactose tolerance and that the lactose intolerant had inherited a genetic mutation.

It was only after years more work with research participants of many races that experts realized that, as one National Institutes of Health official put it in 1981, “lactose intolerance is a normal physiological condition, shared by every adult animal except for certain ethnic and racial groups in man.” People of northern European descent, it turned out, were the weird ones. It was their ancestors who had passed down a genetic mutation – one that made them able to digest milk after infancy.

In short, what scientists discovered in the 1960s was that different bodies process milk differently. What they invented was the idea that lactose intolerance is a defect. Accepting that framing would mean nearly two-thirds of the human population – the estimated prevalence of lactose intolerance worldwide – is defective.

Instead of acknowledging that dairy-free diets can be healthy, people innovated ways to overcome this supposed disability so everyone could consume more.

Statue of cow dressed as Superman in an advertising display, two people working in the background
Milk is advertised in China as essential to health, even though most of the population is lactose intolerant. Ng Han Guan/AP Photo

Nutritional imperialism

Lactose intolerance is one example of what I call nutritional imperialism: a way of thinking that treats white diets as the norm and everyone else’s as an aberration.

Nutritional imperialism was common in the 20th century, when scientists thought that not only milk-rich but also meat-heavy diets were best; they considered diets outside of the United States and Europe too vegetarian. Some also argued that wheat flour, not rice, ought to be the universal staple.

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The same bias applied to bodies. Besides faulty lactose digestion, nonwhite bodies were accused of other failures, too, such as aldehyde dehydrogenase deficiency, an inability to digest alcohol quickly. The less technical term for this may be more familiar: Asian flush.

Such differences might have been thought of as variety, just another way of being human. Instead, each became a deficiency.

Many people today have inherited and perpetuated this way of thinking without knowing it, including those who are deemed deficient by it. In 1959, the director of Japan’s nutrition bureau declared that “rice-eating peoples” such as the Japanese were “resigned and passive” and could correct this by imitating Western diets and switching to wheat.

Grocery store aisle filled with various brands of milk
Milk is ubiquitous in grocery stores in China. Shwangtianyuan/Wikimedia Commons, CC BY-SA

Today, the most prominent scientist promoting the idea that Asian flush is a disease is a geneticist of Taiwanese descent who started a research consortium to study “the most common human enzymopathy in the world.”

The Chinese Nutrition Society placed a tall glass of milk next to its 2022 Food Guide Plate – never mind estimates that the vast majority of Han Chinese, the largest ethnic group in China and worldwide, are lactose intolerant.

Turning sickness back into difference

Science that pathologizes difference helps racism persist.

In recent years, white supremacists have embraced the concept of lactose intolerance as a distinguishing debility of nonwhite people. Social media users have copied and pasted a map of the geographic distribution of lactose tolerance originally published in the scientific journal Nature into racist chat threads on the online discussion forum 4chan.

In 2017, internet trolls disrupted an anti-racist art installation with neo-Nazi chants and messily downed jugs of milk to accentuate their white identity.

Turning a lactose-digestion difference into a deficiency has done more to reinforce narratives of racial hierarchy than to improve public health. So here’s a suggestion: If you enjoy eating dairy, keep doing it; if you don’t, don’t – and know that there is nothing wrong with you.

Hilary Smith, Professor of History, University of Denver

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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