Health
Mental health may be worse in teens from large families, study suggests: 'Fewer resources'
When it comes to family, many might assume “the more, the merrier” — but for some, that might not be the case, according to a recent study.
Researchers from The Ohio State University found that teens with a greater number of siblings reported poorer mental health than those who came from smaller families.
“The association between the number of siblings and mental health was negative in two large datasets in different countries (U.S. and China),” Doug Downey, lead author of the study and professor of sociology at The Ohio State University, told Fox News Digital.
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The large-scale study, published last month in the Journal of Family Issues, included more than 9,400 eighth graders in China and more than 9,100 children of the same age in the U.S.
The participants in both countries answered various questions about their mental health.
Researchers from The Ohio State University found that teens with a greater number of siblings reported poorer mental health than those with smaller families. (iStock)
Based on the responses, among the Chinese teens, the ones with no siblings were found to have the best mental health.
In the U.S., teens with no siblings or just one sibling had the best mental health.
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The age differences between siblings also appeared to be a factor, the study found.
Those who had older siblings and siblings who were born within a year of one another were shown to have the worst mental well-being.
One theory about the study’s findings is what Downey calls the “resource dilution” explanation.
“But when you add more siblings, each child gets fewer resources and [less] attention from the parents, and that may have an impact on their mental health,” said one of the study researchers. (iStock)
“If you think of parental resources like a pie, one child means they get all the pie — all the attention and resources of the parents,” he said in an OSU press release.
“But when you add more siblings, each child gets fewer resources and [less] attention from the parents, and that may have an impact on their mental health.”
“If you think of parental resources like a pie, one child means they get all the pie – all the attention and resources of the parents.”
The researchers were surprised by the findings, given that previous research had shown hints of positive outcomes related to siblings, such as better social skills and lower probability of divorce, noted Downey.
‘Cannot be sure it is causal’
The study did have some limitations, the researchers acknowledged.
“We found an association between [the] number of siblings and poorer mental health — but we cannot be sure that it is causal,” Downey said.
The researchers also did not analyze the quality of sibling relationships, which could have a direct impact on mental health.
The researchers were surprised by the findings, as previous research had shown hints of positive outcomes related to siblings. However, they noted the study’s limitations. They did not analyze the quality of sibling relationships, for instance. (iStock)
At this point, Downey said, it is too early to recommend any changes in human behavior based on these findings.
“Scholars are only beginning to understand the consequences of fertility change,” he told Fox News Digital.
“As fertility decline continues, understanding the consequences of growing up with fewer siblings becomes increasingly important,” he added. “In this case, the evidence appears to be positive.”
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Kim Arrington, a clinical psychologist at Hackensack Meridian Health in New Jersey, was not involved in the study but offered her input on the findings.
“With this study, we are witnessing the results of the evolution of modern societies away from agrarian societies where having multiple children could be an asset to working farms,” she told Fox News Digital.
“In psychology, ‘resource dilution’ suggests that the availability of parental resources, such as time, attention and finances, decreases as the number of children in a family increases,” a psychologist told Fox News Digital. (iStock)
“Now, with greater specialization in jobs and higher economic demands in our culture resulting in many households requiring two working parents, there are fewer resources in the form of attention from parents to go around, no doubt having an effect on child development.”
In Arrington’s opinion, modern cultures are also less likely to have multi-generational households and communities that, in the past, served as additional sources of childcare, when it was easier for families to pool resources.
“Prior studies showed advantages to having more siblings, so overall the data is mixed.”
Alex Dimitriu, M.D., a psychiatrist and founder of Menlo Park Psychiatry & Sleep Medicine in California, also was not part of the OSU research, but he shared his thoughts on the concept of “research dilution.”
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“In psychology, ‘resource dilution’ suggests that the availability of parental resources, such as time, attention and finances, decreases as the number of children in a family increases,” he told Fox News Digital.
“The authors also mention that prior studies showed advantages to having more siblings, so overall the data is mixed,” he added.
Dimitriu said he would expect there to be a “sweet spot” for the number of siblings.
“It appears 0 to 1 may be optimal, per this study — however, I would also expect numerous factors to impact this, including socioeconomic factors, parental divorce and parenting styles.”
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For women over 60, muscle strength plays a critical role in longevity, a new study confirms.
Researchers at the University at Buffalo, New York, followed more than 5,000 women between the ages of 63 and 99, finding that those with greater muscle strength had a significantly lower risk of death over an eight-year period.
The findings were published in JAMA Network Open.
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Muscle function was measured using grip strength and how quickly participants could complete five unassisted sit-to-stand chair raises.
These are two tests commonly used in clinical settings to evaluate muscle function in older adults, the researchers noted.
A recent study shows that stronger muscle strength in women over 60 is linked to a lower risk of death over eight years. (iStock)
“In a community cohort of ambulatory older women, muscular strength was associated with significantly lower mortality rates, even when we accounted for usual physical activity and sedentary time measured using a wearable monitor, gait speed and blood C-reactive protein levels,” study lead author Michael LaMonte, research professor of epidemiology and environmental health at the University at Buffalo, told Fox News Digital.
“Movement is the key — just move more and sit less.”
Many earlier studies did not include those objective measurements, making it difficult to determine whether muscle strength itself was linked to longevity, according to LaMonte. “Our study was able to better isolate the association between strength and death in later life,” he added.
Even for women who don’t get the recommended amount of aerobic physical activity, which is at least 150 minutes per week, muscle strength remained important for longevity, the researchers found.
Women with greater muscle strength were more likely to live longer, even if they did not meet the recommended amount of aerobic exercise. (iStock)
“The findings of lower mortality in those who had higher strength but were not meeting current national guidelines on aerobic activity were somewhat intriguing,” LaMonte said.
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Federal guidelines recommend strengthening activities one to two days per week, targeting major muscle groups.
Resistance training does not have to require a gym membership, LaMonte noted. These exercises can be performed using free weights, resistance bands, bodyweight movements or even household items, such as soup cans.
Experts recommend working major muscle groups one or two days a week using weights, bands or bodyweight exercises. (iStock)
“Movement is the key — just move more and sit less,” he said. “When we can no longer get out of the chair and move around, we are in trouble.”
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LaMonte acknowledged several limitations of the study. The researchers assessed muscle strength in older age but did not explore how earlier levels in adulthood might influence long-term health outcomes.
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“We were not able to understand how strength and mortality relate in younger ages,” he said, noting that future research should explore whether building strength earlier could have an even greater impact on longevity.
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Compounds found in cannabis could provide a new roadmap for treating the world’s most common chronic liver disorder, according to a study released by the Hebrew University of Jerusalem.
The research, published in the British Journal of Pharmacology, found that cannabidiol (CBD) and cannabigerol (CBG) significantly reduced liver fat and improved metabolic health in experimental models.
CBD is the more widely studied non-intoxicating cannabinoid, while CBG is a less common “precursor” cannabinoid from which CBD is formed.
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Unlike THC, the primary psychoactive component in cannabis, these compounds do not produce a “high,” making them viable candidates for long-term medical treatment, the study suggests.
Metabolic dysfunction-associated steatotic liver disease (MASLD) currently affects approximately one-third of the global adult population, according to health data.
Metabolic dysfunction-associated steatotic liver disease (MASLD) currently affects approximately one-third of the global adult population. (iStock)
The condition, which is closely linked to obesity and insulin resistance, has few approved pharmaceutical treatments, the researchers said, leaving patients to rely largely on lifestyle changes that can be difficult to maintain.
“Our findings identify a new mechanism by which CBD and CBG enhance hepatic energy and lysosomal function,” said lead study author Joseph Tam, director of the Multidisciplinary Center for Cannabinoid Research at Hebrew University, in a press release.
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The study highlights a process called “metabolic remodeling,” in which the cannabis compounds created a “backup battery” for the liver by increasing levels of phosphocreatine, a high-energy molecule stored in muscle cells.
This energy reserve helps the organ function under the stress of a high-fat diet, which was an unexpected discovery, the team noted.
Researchers focused on CBD and CBG, two non-psychoactive compounds that offer therapeutic benefits without the “high” associated with THC. (iStock)
The researchers also found that CBD and CBG restored the activity of “cellular cleaning crews” known as cathepsins, enzymes that work within the cell’s recycling centers to break down harmful fats and waste.
With this process, the liver was better able to clear out dangerous lipids, including triglycerides and ceramides, which are known to trigger inflammation, the study showed.
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While both compounds were effective, CBG showed more robust results in certain areas, such as reducing total body fat mass, lowering “bad” LDL cholesterol and improving insulin sensitivity.
Researchers say this study opens a new path for using plant-based compounds to treat metabolic diseases by focusing on how cells manage energy and waste.
The discovery of a phosphocreatine “backup battery” in the liver marks a significant shift in how scientists understand the organ’s ability to survive high-fat diets. (iStock)
Limitations and caveats
Despite the promising results, the research team cautioned that the study was conducted in a controlled experimental environment. Further clinical trials are necessary to determine the proper application for human patients.
Other recent studies have pointed to potential issues with using cannabis as a medical tool.
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A major analysis published in JAMA examined more than 2,500 scientific papers from the last 15 years, including other reviews, clinical trials and guidelines focused on medical marijuana.
The 2025 review highlighted significant gaps between public perception and scientific evidence regarding cannabis’ effectiveness for most medical conditions.
Other recent studies have pointed to issues with the efficacy of cannabis as a medical tool. (iStock)
The researchers concluded that there are very few conditions for which cannabinoid therapies have clear, well-established benefits backed by high-quality clinical data.
“Whenever a substance is widely used, there is likely to be a very wide set of outcomes,” Alex Dimitriu, MD, who is double board-certified in psychiatry and sleep medicine and founder of Menlo Park Psychiatry & Sleep Medicine, previously told Fox News Digital. “This study points to the reality that this widely used substance is not a panacea.”
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The strongest evidence supports FDA-approved cannabinoid medications for treating specific conditions, including HIV/AIDS-related appetite loss, chemotherapy-induced nausea and vomiting, and certain severe pediatric seizure disorders, according to the review.
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Anyone interested in using marijuana for medical purposes should speak to a healthcare provider to discuss potential risks and benefits.
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While cannabis has recently come under fire for potential negative health risks, a recent study suggests that its use could increase brain volume and cognitive fitness.
Researchers at the University of Colorado Anschutz Medical Campus analyzed cannabis usage, brain scans and cognitive test results for more than 26,000 adults between the ages of 40 and 77, using data from the UK biobank.
The study found that cannabis users — particularly those who reported moderate lifetime usage — showed larger volumes in several brain regions.
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“Compared to individuals with no history of cannabis use, those who reported using cannabis showed larger volumes in several brain regions characterized by a high density of cannabinoid (CB1) receptors — regions involved in processes such as memory, information processing and emotion regulation,” lead study author Anika Guha, Ph.D., a researcher at the University of Colorado Anschutz Medical Campus, told Fox News Digital.
A recent study suggests that cannabis use could increase brain volume and cognitive fitness. (iStock)
The cannabis users also scored better on cognitive tests that measured learning, processing speed and executive function.
This outcome differs from many previous studies, which have focused on short-term cognitive impairment during or shortly after cannabis use, the researcher pointed out.
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“These findings suggest that the relationship between cannabis and the brain may differ across the lifespan, and that moderate use in mid-to-later adulthood may be associated with positive brain health outcomes,” Guha said.
Not all areas of the brain showed positive effects among cannabis users. The posterior cingulate, which is involved in self-reflection and memory, had lower volume with higher marijuana use.
“The takeaway is not that people should start using more cannabis based on these findings alone.”
As cannabis has been rising in popularity among all ages, this type of study is important for understanding its long-term effects and the pros and cons of use, according to Matt Glowiak, Ph.D., chief addiction specialist with Recovered, an organization that provides information and resources for mental health and addiction treatment.
The drug’s effects likely depend on factors such as age, dose, frequency, product composition and individual vulnerability. (AP Photo/Martin Meissner, File)
“Given the connection between cannabis use and larger brain volume, it is believed that it may help [older] individuals retain cognitive function that might otherwise naturally decline,” Chicago-based Glowiak, who was not involved in the study, told Fox News Digital.
“This is a huge benefit, but one we need to explore a bit further, ahead of encouraging those who would otherwise not consider integrating cannabis into their healthcare regimen.”
Limitations and caveats
As the study was observational in nature, it could not prove that cannabis use improves brain health — instead, it only showed an association, according to Dr. Marc Siegel, Fox News senior medical analyst, who was not involved in the study.
“The preponderance of previous evidence does not line up with improved cognitive function from chronic cannabis use,” Siegel told Fox News Digital. “This study is an outlier, and though it cannot be ignored, it is not justification for use.”
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The study also relied on the UK Biobank, which offers a “large and rich dataset,” Guha said — but it is limited to the questions that were originally posed to the participants.
“In particular, we have only a broad measure of how many times someone has used cannabis over their lifetime,” she said. “We do not have access to details about how they used cannabis, such as whether they smoked or used edibles, the type or potency of cannabis, or when in their life they used most heavily.”
Cannabis users scored better in learning, processing speed and executive function. (iStock)
“Those details likely matter a great deal for understanding how cannabis affects the aging brain.”
Given these limitations, Guha suggests that the findings should be seen as an early indicator that cannabis use may be related to brain aging, “and as a starting point for more targeted research that can tease apart these relationships.”
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“The takeaway is not that people should start using more cannabis based on these findings alone,” she emphasized. “While cannabis may have potential benefits in some contexts, a substantial body of research also documents important risks, underscoring that cannabis is neither completely beneficial nor completely harmful.”
The drug’s effects likely depend on factors such as age, dose, frequency, product composition and individual vulnerability, according to Guha.
“Given the widespread use and legalization of cannabis, it would be great to know that it is net-positive for brain health — however, this feels too good to be true, and too early to claim,” one expert said. (AP)
“As with any substance, individuals should consult with a healthcare provider before initiating use, particularly if they have a history of mental health concerns, as THC (the primary psychoactive component of cannabis) can exacerbate symptoms such as psychosis in vulnerable individuals,” she added.
Dr. Alex Dimitriu, who is double board-certified in psychiatry and sleep medicine and the founder of Menlo Park Psychiatry & Sleep Medicine, reiterated that this study is an “outlier,” as most previous research has shown “detrimental effects” from cannabis use.
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“Given the widespread use and legalization of cannabis, it would be great to know that it is net-positive for brain health — however, this feels too good to be true, and too early to claim,” he said. “I would advise proceeding with caution and moderation.”
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Dimitriu agreed that more large-scale studies and review papers are needed to get a “clearer picture.”
“What this cannabis study shows is that there may be conflicting information, which warrants more investigation.”
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