NewsMakers
Eating too much – not exercising too little – may be at core of weight gain, study finds
Conventional wisdom suggests that an increasingly sedentary and germ-free lifestyle, resulting in low daily energy expenditure, is a primary factor underlying rising rates of obesity.
Forager-horticulturalist children in the Amazon rainforest do not spend more calories in their everyday lives than children in the United States, but they do spend calories differently. That finding provides clues for understanding and reversing global trends in obesity and poor metabolic health, according to a Baylor University researcher in a study published in Science Advances.
“Conventional wisdom suggests that an increasingly sedentary and germ-free lifestyle, resulting in low daily energy expenditure, is a primary factor underlying rising rates of obesity,” said Samuel Urlacher, Ph.D., assistant professor of anthropology at Baylor University. “The findings of our study challenge that notion. We demonstrate that Amazonian children with physically active lifestyles and chronic immunological challenges don’t actually burn more calories than much more sedentary children living here in the U.S.”
“This similarity in energy expenditure suggests that the human body can flexibly balance energy budgets in different contexts,” Urlacher said. “Ultimately, eating too much, not moving too little, may be at the core of long-term weight gain and the global nutrition transition that often begins during childhood.”
The study — “Constraint and Tradeoffs Regulate Energy Expenditure During Childhood” — is published in Science Advances, a journal of the American Association for the Advancement of Science.
Standard models in human nutrition assume that habitual energy use is “additive,” such that exercise and other metabolic tasks increase total daily energy expenditure, which is the total number of calories that humans burn each day. Consistently exercise more, spend more total calories. However, that model has been increasingly challenged by studies suggesting that total daily energy expenditure is “constrained” within a relatively narrow human range. Consistently exercise more, spend fewer calories on other metabolic tasks and no extra calories overall. Until now, no research had directly tested these two opposing models of energy use among children living in challenging environments.
To investigate how children spend calories, Urlacher and his colleagues collected energetics data from 44 forager-horticulturalist Shuar children (ages 5 to 12) and compared them to those of industrialized children in the U.S. and the United Kingdom. The Shuar are a population of around 50,000 individuals living in the isolated Amazon region of Ecuador. Without easy access to stores and labor-saving technology, they continue to rely predominantly on a subsistence-based lifestyle of hunting, fishing, foraging and small-scale horticulture. To measure energy expenditure, the researchers used gold-standard isotope-tracking and respirometry methods, the first time that either state-of-the-art approach had been used among children in a subsistence-based population. This new information was coupled with data reflecting physical activity, immune activity, nutritional status and growth.
Results provide strong support for constraint and tradeoffs in children’s energy expenditure. The study found that:
- Shuar children are approximately 25% more physically active than industrialized children.
- Shuar children have approximately 20% greater resting energy expenditure than industrialized children, to a large degree reflecting elevated immune system activity.
- Despite wide differences in lifestyle and energy allocation, the total number of calories that Shuar children spend every day is indistinguishable from that of industrialized children.
“These findings advance previous work among adults, showing that energy expenditure is also constrained during childhood,” said co-author Herman Pontzer, Ph.D., associate professor of evolutionary anthropology at Duke University.
Researchers argue that because tradeoffs underlying energy constraint may often limit physical growth, such constraint has implications for understanding childhood growth faltering and its associated increased risk for adult obesity and metabolic diseases such as Type 2 diabetes and hypertension. Specifically, the findings imply that a high degree of physical and immune activity may reduce energy available for growth, even when food is abundant.
A key takeaway of the study is that rapid change in diet and increasing energy intake, not decreasing physical activity or infectious disease burden, may most directly underlie the chronic weight gain driving the global rise of obesity. However, “Exercise remains critically important for health and for weight management given its effects on appetite, muscle mass, cardiopulmonary function and many other factors,” Urlacher said. “Our results don’t suggest otherwise. Everyone should meet recommended daily physical activity levels.”
The researchers recognize several ways to improve upon their study in the future, including considering a wider age range of children, comparing additional study populations and collecting longitudinal data spanning economic development and lifestyle variation within a single transitioning population. Importantly, the authors will continue to look for ways to better apply their findings to improve health among the Shuar and other populations globally.
Urlacher, a co-director of the long-term Shuar Health and Life History Project, has spent more than 25 months living with the Shuar since 2011.
“I really care about the Shuar,” Urlacher said. “The science is exciting, but, ultimately, we hope that our research can help to improve health among the Shuar, in the U.S. and elsewhere.”
Financial support for the study was provided by the National Science Foundation.
Co-researchers included the Department of Evolutionary Anthropology at Duke University; the Department of Anthropology at the University of Oregon; the Department of Preventive Medicine and Epidemiology at Loyola University; the Department of Anthropology at Northern Arizona University; and the Duke Global Health Institute at Duke University.
NewsMakers
5 Tips to upgrade your sleep
Sleep contributes to better brain function, memory, concentration and lower stress. According to the National Institutes of Health, most adults need 7-9 hours of sleep every night to achieve maximum health benefits.
Good sleep isn’t just about waking up feeling rested and ready for the day. Quality sleep, and plenty of it, is important for your overall health. While you sleep, your body naturally recharges itself, which puts you at lower risk for cardiovascular problems and chronic conditions like diabetes, as well as improving your immune system.
Sleep also contributes to better brain function, memory, concentration and lower stress. According to the National Institutes of Health, most adults need 7-9 hours of sleep every night to achieve maximum health benefits.
If you’re falling short of the recommended amount of sleep, you may be able to make some adjustments that help you reap the health benefits of better rest. Learn what you can do to improve your sleep with these tips from the experts in safer, healthier sleep at Naturepedic.
Reduce Light Exposure
Your body’s natural circadian rhythms are closely aligned with light and dark. When your body senses light, it sends signals to your brain that it’s time to be awake. Light also suppresses your body’s production of melatonin, a hormone linked to sleep. Cutting back on bright lights and avoiding devices at least an hour before bed can tell your body it’s time to wind down, and sleeping in a dark room promotes better rest.
Invest in the Right Mattress
Your mattress plays a major role in your comfort through the night, so making sure it fits your needs is an important step toward getting better rest. Take control of your comfort with a quality mattress such as Naturepedic’s EOS (Ergonomic Organic Sleep) mattress, which is handcrafted and made without polyurethane foam, formaldehyde, flame retardants or fiberglass. The breathable layers of certified organic cotton, wool and GOTS-approved latex ensure better temperature regulation while naturally contouring the body. An added feature is the ability to customize each side of the bed by opening the zippers and adjusting the layered components for the perfect comfort combination.
Find the Right Sheets
Sheets that are too stiff, scratchy or otherwise unpleasant make it nearly impossible to settle in for a good night’s rest. Higher thread counts tend to be softer, higher quality sheets. However, you may need to experiment to find which material suits you best.
Set a Comfortable Temperature
When you’re too hot or cold, your mind tends to focus on those sensations rather than allowing you to slip into a slumber. Set your thermostat at a comfortable temperature, adding fans or adjusting the layers of bedding as necessary to achieve the perfect level of cozy comfort.
Use a Sound Machine
If you’re a light sleeper, noise can wreak havoc on your rest. Many people find sound machines offer two key benefits: They provide a soothing sound, such as rain or ocean waves, that allows you to relax and ease into slumber and constant background noise, so additional sounds are less disruptive.
Find more solutions for achieving better sleep at Naturepedic.com.
NewsMakers
What you should know about IBD
Two common conditions are irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD). They’re often confused for one another, but these are actually two different GI disorders.
It may not be something you like to talk about, but if you have gastrointestinal (GI) problems, your symptoms may be far more common than you think. According to data from the American Gastroenterological Association, 60-70 million people living in the United States have gut health concerns.
Two common conditions are irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD). They’re often confused for one another, but these are actually two different GI disorders.
IBS is a syndrome; it is defined by a group of symptoms, does not cause inflammation and rarely requires hospitalization or surgery. IBD, on the other hand, is an umbrella term used to describe disorders that cause chronic inflammation of your GI tract.
The disease is more common than you may realize; a study led by the Crohn’s & Colitis Foundation found nearly 1 in 100 people living in the U.S. have IBD. The two most common forms of IBD are Crohn’s disease and ulcerative colitis.
Understanding IBD Symptoms
Because it poses serious health risks and can cause permanent damage to your intestines, it’s important to be aware of what IBD is and recognize the symptoms. Your primary care doctor or gastroenterologist can help if you have concerns about these symptoms:
- Intense, crampy pain that doesn’t go away in a day or two or has been present on and off for weeks or longer
- A notable change in bowel movement frequency, whether more or less often
- Frequent diarrhea over several weeks, or loose stools multiple times a day
- Frequent constipation, or constipation alternating with diarrhea
- Urgency on a regular basis or inability to hold back the bowel movement before reaching the bathroom
- Blood with bowel movements
- Mucus in your stool regularly or paired with pain or other symptoms
- Always feeling as though you aren’t fully emptying your bowels
Other symptoms that may have a variety of causes but need extra attention especially if you notice them along with any of the symptoms above include pain outside of the gut, fatigue, loss of appetite and weight loss. In addition, children with IBD may have delays in growth and the onset of puberty.
Diagnosing IBD
No single test can confirm a Crohn’s or ulcerative colitis diagnosis. Your medical history and information obtained from diagnostic testing can exclude other potential causes of your symptoms, since gastrointestinal symptoms are common and can have a variety of causes.
Your first tests will likely include blood and stool laboratory tests. Further testing could include imaging studies of your gastrointestinal tract or a look inside your GI tract through an endoscope.
Identifying Treatment Options
Once an IBD diagnosis is confirmed, you can partner with your doctor to manage your disease. Treatment plans are highly personalized, as what works for one person may not for another. Medication and managing your diet and nutrition are two common treatment recommendations. In some cases, surgery can help improve your quality of life.
Clinical trials may also be an option for treating your IBD. Through clinical trials, researchers find new ways to improve treatments and quality of life. In fact, clinical trials represent the final stages of a long and careful research process to make new and improved treatment options for patients available.
However, an important part of clinical trials for IBD is patient participation. Without the enrollment of patients in clinical trials, new treatment options for IBD can be delayed or never become available.
Equally important to this process is having a diverse representation of patients that considers race, age or other categories. This helps researchers develop treatments that meet the needs of a vast IBD patient community.
If you’re interested in participating in a clinical trial, ask your doctor to help you find a trial that is right for you, and visit crohnscolitisfoundation.org to learn more about IBD and treatment options, including clinical trials.
NewsMakers
Unlocking the science of sleep: How rest enhances language learning
Getting eight hours of sleep every night helps the brain to store and learn a new language.
Sleep is critical for all sorts of reasons, but a team of international scientists has discovered a new incentive for getting eight hours of sleep every night: it helps the brain to store and learn a new language.
A study led by the University of South Australia (UniSA) and published in the Journal of Neuroscience has revealed that the coordination of two electrical events in the sleeping brain significantly improves our ability to remember new words and complex grammatical rules.
In an experiment with 35 native English-speaking adults, researchers tracked the brain activity of participants learning a miniature language called Mini Pinyin that is based on Mandarin but with similar grammatical rules to English.
Half of the participants learned Mini Pinyin in the morning and then returned in the evening to have their memory tested. The other half learned Mini Pinyin in the evening and then slept in the laboratory overnight while their brain activity was recorded. Researchers tested their progress in the morning.
Those who slept performed significantly better compared to those who remained awake.
Lead researcher Dr Zachariah Cross, who did his PhD at UniSA but is now based at Northwestern University in Chicago, says sleep-based improvements were linked to the coupling of slow oscillations and sleep spindles – brainwave patterns that synchronise during NREM sleep.
“This coupling likely reflects the transfer of learned information from the hippocampus to the cortex, enhancing long-term memory storage,” Dr Cross says.
“Post-sleep neural activity showed unique patterns of theta oscillations associated with cognitive control and memory consolidation, suggesting a strong link between sleep-induced brainwave co-ordination and learning outcomes.”
UniSA researcher Dr Scott Coussens says the study underscores the importance of sleep in learning complex linguistic rules.
“By demonstrating how specific neural processes during sleep support memory consolidation, we provide a new perspective on how sleep disruption impacts language learning,” Dr Coussens says. “Sleep is not just restful; it’s an active, transformative state for the brain.”
The findings could also potentially inform treatments for individuals with language-related impairments, including autism spectrum disorder (ASD) and aphasia, who experience greater sleep disturbances than other adults.
Research on both animals and humans shows that slow oscillations improve neural plasticity – the brain’s ability to change and adapt in response to experiences and injury.
“From this perspective, slow oscillations could be increased via methods such as transcranial magnetic stimulation to accelerate aphasia-based speech and language therapy,” Dr Cross says.
In future, the researchers plan to explore how sleep and wake dynamics influence the learning of other complex cognitive tasks.
“Understanding how the brain works during sleep has implications beyond language learning. It could revolutionize how we approach education, rehabilitation, and cognitive training.”
-
Destinations1 week ago
Siquijor Island is the PH’s top emerging destination – Agoda
-
NewsMakers7 days ago
What you should know about IBD
-
Nutrition7 days ago
Elevate your lunch with comforting staples
-
NewsMakers7 days ago
5 Tips to upgrade your sleep
-
Nutrition7 days ago
Cozy, comforting recipes to take on the cold
-
Home Care7 days ago
Safety tips to help families prevent carbon monoxide poisoning and fires
-
Pet Care7 days ago
New year, new goals for people and pets