Health
‘Yo-yo’ weight loss occurs because of this surprising reason
About 40% of American adults live with obesity — and for many, it can feel a bit like a roller-coaster ride as their weight fluctuates up and down.
The cycle of losing and regaining weight, commonly known as the yo-yo effect, could be due to a type of “metabolic memory,” in which the body remembers and strives to return to its former state of obesity, according to a new study.
“Obesity is a chronic condition with significant metabolic consequences, strongly linked to various metabolic and cardiovascular diseases,” study author Dr. Ferdinand von Meyenn, assistant professor for nutrition and metabolic epigenetics at ETH Zurich in Switzerland, told Fox News Digital.
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“A well-documented observation is that the body tends to defend increased body weight, making weight loss and maintenance notoriously challenging.”
Obesity is a common chronic disease in the U.S., with one in five children and two out of five adults meeting the criteria, according to the Centers for Disease Control and Prevention (CDC).
The cycle of losing and regaining weight on repeat, commonly known as the yo-yo effect, could be due to a type of “metabolic memory,” a new study found. (iStock)
The new research, published in November in the journal Nature, points to epigenetics (genetic activity) that may play a role in regaining weight after weight loss.
What is epigenetics?
“Epigenetics, which involves chemical markers that influence gene activity without altering the DNA sequence, is crucial in how cells function and respond to environmental factors,” Dr. Fatima Cody Stanford, obesity medicine physician at Massachusetts General Hospital and Harvard Medical School, told Fox News Digital.
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“These markers can be altered by lifestyle factors, such as diet, and can remain stable for years, effectively creating a cellular ‘memory’ of past states, such as obesity,” added Stanford, who was not part of the study.
It is well-known that cells keep their genetic identity as they divide. The researchers were curious about what happens to fat cells — which live on average for 10 years before the body replaces them, von Meyenn said.
The researchers investigated what happens to fat cells, which live on average for 10 years before the body replaces them. (iStock)
This differs from other cells in tissues, which divide much faster – intestinal cells, for example, generally divide every other week, he added.
Fat cells still must adapt to external stimuli and undergo epigenetic adaptations, von Meyenn noted.
The researchers set out to determine whether these changes could be reversed.
Fighting ‘memory’ in fat cells
In mouse studies, the researchers found that even after significant weight loss, their cells have a “memory” of obesity encoded in the epigenome, which controls the activity of genes, said von Meyenn.
“Our study indicates that one reason maintaining body weight after initial weight loss is difficult is that the fat cells remember their prior obese state and likely aim to return to this state,” he told Fox News Digital.
“The body tends to defend increased body weight, making weight loss and maintenance notoriously challenging.”
“This means one would have to ‘fight’ this obesogenic memory to maintain body weight.”
Based on this research, a failure to maintain weight loss after dieting is not necessarily due to lack of effort or willpower, but could also be driven by an underlying biological phenomenon, von Meyenn added.
Potential limitations
The research looked only at fatty tissue, and the genetic mechanisms were studied only in mice. Even so, the researchers said they believe that similar mechanisms also apply to humans.
Other experts cautioned, however, that the study shows only association and does not prove that epigenetic changes cause the yo-yo effect.
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“The authors pointed out that they cannot say for certain that the epigenetic modifications directly cause people to regain their lost weight, nor pinpoint which specific epigenetic markers may be driving this effect,” Petronella Ravenshear, board-certified nutritionist and author of “The Human Being Diet,” told Fox News Digital.
Florida-based Ravenshear, who was not part of the study, noted that the results should not lead people to claim, “It’s not my fault, it’s my genes!”
Plans for future research
“We will need to now expand, see how the memory can be erased and whether other cells or tissues are also affected, [such as] the brain or the liver,” von Meyenn said.
It’s possible that if people maintain a healthy weight for a year or longer after dieting, that may be enough time to erase the memory in fat cells, according to Ravenshear.
The term “diet,” in its original connotation, means “way of living” — but it is now synonymous with short-term dietary changes that are unsustainable, one expert said. (iStock)
“This discovery underscores the importance of preventing obesity, particularly in children and adolescents, to avoid establishing this epigenetic memory that complicates long-term weight management,” Stanford noted.
“Understanding these mechanisms further could lead to more effective treatments and prevention strategies, emphasizing the need for a proactive approach to weight management from an early age,” she added.
‘Way of living’
The term “diet,” in its original connotation, means “way of living” — but it is now synonymous with short-term dietary changes that are unsustainable, Ravenshear noted.
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People often regain the weight they lose when they return to the eating habits that led to weight gain in the first place, many experts agree.
Ravenshear cited Professor David Benton at Swansea University in the U.K., author of “Tackling the Obesity Crisis,” who recently shared in a Guardian interview, “The mantra is that diets fail.”
One expert recommends focusing on breaking addictions to sugar and refined carbohydrates and embracing a new way of eating. (iStock)
“They fail because to avoid regaining lost weight, you need to permanently change your diet.”
After finishing a diet, many people return to the previous lifestyle that caused the problem in the first place, he noted.
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“Frequently snacking, and eating calorie-dense, nutrient-poor foods, disrupts our blood sugar, raises insulin levels and adds to inflammation – and the inflammation itself makes it harder to lose weight,” Ravenshear told Fox News Digital.
“Eating calorie-dense, nutrient-poor foods disrupts our blood sugar, raises insulin levels and adds to inflammation – and the inflammation itself makes it harder to lose weight,” one expert cautioned. (iStock)
She recommends focusing on breaking addictions to sugar and refined carbohydrates and embracing a new way of eating.
The expert suggests choosing nutrient-dense whole foods, eating three meals a day, and fasting with nothing but water for five hours between meals.
The weight loss occurs as a side effect of rebalanced hormones and lowered inflammation, she noted.
Ravenshear added, “When we are getting the calories, but not the nutrients that our body and brain need, we’re always hungry because our brain drives us to keep searching for food.”
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Red light therapy has been shown to reduce brain inflammation, protecting people who experience head trauma from long-term health consequences, a University of Utah study has shown.
Brain damage from repeated impact over the years is known to cause cognitive symptoms, ranging from memory issues to full-blown dementia, particularly affecting soldiers and athletes.
Chronic traumatic encephalopathy (CTE) is a progressive, degenerative brain disease linked to repeated head impacts rather than a single injury, according to Mayo Clinic.
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More than 100 former NFL football players have been posthumously diagnosed with CTE, according to the new study, which was published in the Journal of Neurotrauma.
Other research has shown that military personnel in active combat suffer from similar issues, as do first responders and veterans.
The treatment was administered three times a week for 20 minutes using specialized headsets and intranasal devices designed to penetrate the skull. (iStock)
In the new study, the researchers recruited 26 current football players to understand more about the impact of red-light therapy on brain injuries.
The participants received either red light therapy delivered by a light-emitting headset and a device that clips into the nose, or a placebo treatment with an identical device that doesn’t produce light. Players self-administered the therapy three times a week, 20 minutes each time, for 16 weeks.
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“My first reaction was, ‘There’s no way this can be real,’” said first author Hannah Lindsey, Ph.D., in the university press release. “That’s how striking it was.”
Specific wavelengths of light are believed to enter the brain and reduce molecules that trigger inflammation, potentially halting the path toward dementia and other cognitive conditions. (iStock)
Players using the placebo treatment experienced increased brain inflammation over the course of the season. Magnetic resonance imaging (MRI) scans taken at the end of the season showed significantly more signs of inflammation than at the beginning of the season, the study found.
For players who used red-light therapy during the season, their brain inflammation didn’t increase at all.
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Previous studies have shown that red light, if powerful enough, can penetrate the skull and reach the brain, where it may reduce inflammation-related molecules.
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“When we first started this project, I was extremely skeptical,” said Elisabeth Wilde, Ph.D., the senior author on the study. “But we’ve seen consistent results across multiple of our studies, so it’s starting to be quite compelling.”
Study limitations
The study was conducted using a small sample size, which led to different levels of inflammation in the treatment and control groups, the researchers acknowledged.
While the placebo group showed increased brain inflammation during the football season, those receiving red light therapy showed no increase in inflammatory markers. (iStock)
Future large randomized clinical trials will be “crucial to back up the results” in larger populations, they noted.
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“We’ve been trying to figure out how to make sports safer, so that our kids, friends and family can participate in sports safely for the long term while they’re involved in activities that give them happiness and joy,” Carrie Esopenko, Ph.D., second author of the study, said in the release.
“And this really feels like part of the hope for protecting the brain that we’ve been searching for.”
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The team plans to recruit 300 people with persistent symptoms from TBI or concussion for a randomized controlled trial in 2026, with a focus on first responders, veterans and active-duty service members.
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Drinking heavily and consistently over an adult’s lifetime could lead to a higher risk of colorectal cancer, according to a study published in the journal Cancer by the American Cancer Society (ACS).
The study analyzed 20 years of data from more than 88,000 U.S. adults to determine how long-term drinking impacted the risk of developing colorectal cancer (CRC) or precancerous colorectal adenomas (polyps).
The participants reported their average weekly intake of beer, wine and liquor intake during four age periods — 18 to 24, 25 to 39, 40 to 54, and 55 and older.
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“Heavy drinkers” were identified as having more than 14 drinks per week and “moderate drinkers” had between seven and 14 drinks per week.
The observational research revealed that consistent heavy drinking over adulthood was linked to a higher risk of colorectal cancer, especially rectal cancer.
Researchers found a major association between colorectal cancer diagnosis and heavy lifetime drinking. (iStock)
Heavy lifetime drinking was associated with a 25% higher overall CRC risk and nearly double the risk of rectal cancer. Moderate lifetime drinking had a lower overall CRC risk.
Compared to light drinkers, the consistently heavy drinkers had about a 91% higher risk of CRC.
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For colorectal adenomas (precancerous polyps), higher current lifetime drinking did not show a strong pattern, although former drinkers showed a significantly lower risk of non-advanced adenoma compared to current light drinkers.
Out of the 88,092 participants, 1,679 were diagnosed with colorectal cancer.
Out of the 88,092 participants in the study, 1,679 were diagnosed with colorectal cancer. (iStock)
The authors noted that the research was limited, as it was observational and not based on a clinical trial. It also hinged on self-reported alcohol use.
The findings suggest that consistently heavy alcohol intake and higher average lifetime consumption “may increase CRC risk, whereas cessation may lower adenoma risk,” the researchers stated. Associations “may differ by tumor site,” they added.
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The link between drinking alcohol and cancer is not a new discovery, according to health experts.
In a recent episode of the podcast “The Dr. Mark Hyman Show,” Dr. Mark Hyman, chief medical officer of Function Health in California, detailed how even moderate drinking can impact “nearly every organ system in the body,” due to metabolic stress, inflammation, impaired detoxification and its effect on hormones.
The link between drinking alcohol and cancer is not a new discovery, according to health experts. (iStock)
Drinking has been found to increase the risk of many cancers, metabolic dysfunction, gut microbiome disturbances and mitochondrial toxins, Hyman said.
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“Bottom line, alcohol taxes every major system in your body, especially your liver, your brain, your gut, your hormones,” he warned.
Reducing or eliminating alcohol can lower the risk of several cancers, according to medical experts. (Getty Images)
In a previous interview with Fox News Digital, Dr. Pinchieh Chiang, a clinician at Circle Medical in San Francisco, shared that taking a break from drinking alcohol for longer periods of time can “reshape health more profoundly.”
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“Over months to a year, we see sustained improvements in blood pressure, liver function and inflammation,” she said. “Those changes directly affect long-term heart disease and stroke risk.”
Chiang added, “Reducing or eliminating alcohol lowers the risk of several cancers, including breast and colorectal, over time.”
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Fox News Digital reached out to the study researchers for comment.
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A mysterious hum is reportedly plaguing the residents of Cincinnati, keeping people up at night and even disturbing them psychologically.
Residents of the Northside, Clifton and Camp Washington neighborhoods have been reporting the disturbances since December. The noises are said to be louder and more noticeable at night.
“We were hearing this siren-like quality noise — whirring, oscillating, going up and down,” said Clifton resident Shaun Herold, who contacted local news outlet WKRC about the noises.
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“My son came up to me and said, ‘Dad, the tornado sirens are going off,’” Herold said. “Usually, it starts at about 10 p.m. It can go till 3 a.m., 4 a.m. But it’s quite unpredictable.”
“It kind of stresses me out ’cause I don’t know what it is. It’s kind of scary,” added his son, Elijah Herold.
A mysterious, intermittent hum has been disturbing Cincinnati residents since December, disrupting sleep and causing psychological stress. (iStock)
Herold said he spent one entire night tracking how many times he heard the noise going on and off. The duration of the noises can vary from a few seconds to several minutes.
“I feel like it’s definitely like a foreign sound,” Northside’s Brendan Marcum told the news outlet. “Some nights it would be a little louder, some nights it would be a little quieter.”
“It kind of stresses me out because I don’t know what it is, and it’s kind of scary,” added another resident.
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Hundreds of Cincinnati residents have shared their theories about potential sources of the sound on social media, ranging from biblical to supernatural.
On Reddit, other users blamed the recycling plant. “My favorite theory is River Metals Recycling,” one person wrote, claiming that the plant moved neighborhoods when the original location “wouldn’t put up with the noise from its metal shredder any longer.”
Residents have described the sound as a siren-like, oscillating whirring that can last from seconds to several minutes. (iStock)
Others suspect the noise is coming from a failing turbocharger on a diesel train engine at the nearby CSX Queensgate, a major freight rail yard in Cincinnati.
While the yard routinely generates loud, mechanical sounds, residents say they’ve never heard anything like this before.
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WKRC reported that an anonymous source sent recordings of the locomotive, claiming it to be the source of the sound. However, a spokesperson for CSX told the news station that he “has not heard a noise like that on our property” and suggested it could be coming from another location.
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He added that any equipment requiring maintenance is “handled through established operating and mechanical protocols.”
According to a source, rail crews have reported the engine for excessive noise and believe it will be repaired. (iStock)
“We just hope to get to the bottom of it, figure out what it is, and if it’s, you know, a temporary thing or not,” Herold told the news outlet. “And hopefully the community can rally if it’s not temporary, because it’s really impacting us.”
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City officials recommend that residents report the noise to 311, the city’s non-emergency line.
Fox News Digital reached out to Cincinnati officials for updates.
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