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This common habit could be quietly hurting men’s fertility, experts warn

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This common habit could be quietly hurting men’s fertility, experts warn

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As the Trump administration moves to loosen federal restrictions on drugs — including a new step to ease regulations on state-licensed medical marijuana — questions are growing about cannabis use and its broader health effects.

Among them is a lesser discussed concern: men’s fertility.

During National Infertility Awareness Week, experts are drawing attention to the potential negative impact of both recreational and medical cannabis on male reproductive health.

MALE FERTILITY RATES CRASH AS DOCTORS REVEAL HEALTH THREATS

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Cannabis use has been associated with changes in reproductive health for both males and females, though human evidence remains mixed.

“This is especially disheartening when men and women are actively trying to conceive and start a family,” Dr. Alta DeRoo, chief medical officer of the Hazelden Betty Ford Foundation in Minnesota, told Fox News Digital.

As the Trump administration moves to loosen federal restrictions on drugs, questions are growing about cannabis use and its broader health effects. (AP Photo/Martin Meissner, File)

A 2025 Harvard-linked study involving women undergoing fertility treatment revealed twice as many miscarriages among those using cannabis compared to non-users.

It’s a common misconception, however, that fertility issues are always due to an issue with the woman. Male infertility is more common than many think, according to Stephanie Seminar, MD, chief of the Reproductive Endocrine Unit at Massachusetts General Hospital, a founding member of Mass General Brigham in Boston, Massachusetts.

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“Many individuals think infertility is a woman’s problem, [but] male infertility is common and under-evaluated,” Seminar told Fox News Digital.

Out of the 10% to 15% of couples worldwide who experience infertility, male factors cause or contribute to approximately 45% of those cases, data shows.

Cannabis use, particularly when heavy and chronic, can have negative effects on male fertility, a doctor cautioned.  (iStock)

Having normal sexual drive and performance does not mean that a man has normal fertility, Seminar noted.

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An evaluation of male infertility goes beyond semen analysis, examining factors like sexual dysfunction, toxin exposure, tobacco/cannabis use, childhood illnesses and past testosterone use, according to medical experts.

How cannabis may affect male fertility

Cannabis use, particularly when heavy and chronic, can have negative effects on male fertility, Seminar cautioned. Those can include changes in reproductive hormones and semen parameters, including decreased sperm counts or mobility.

USING MARIJUANA TO COPE WITH STRESS OR TRAUMA MAY BACKFIRE, STUDIES WARN

Cannabis can also impact sperm quality, the doctor said. “The sperm count or volume can be lower, and those sperm produced may be malformed and unable to swim effectively,” the doctor said.

Research supports this decline – a 2019 review published in The Journal of Urology found associations between cannabis use, especially the smoked form, and reduced semen quality.

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“Many individuals think infertility is a woman’s problem, [but] male infertility is common and under-evaluated.”

Another study of 1,215 healthy young Danish men, published in the American Journal of Epidemiology, found that smoking cannabis more than once per week was associated with a 28% lower sperm concentration and 29% lower total sperm count.

Combining marijuana with other recreational drugs more than once a week reduced sperm concentration and count even higher – by 52% and 55%, respectively.

Disruption of reproductive hormones

The human body produces its own natural endocannabinoids to regulate vital functions like fertility, as described in a Nature Reviews Urology analysis.

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Cannabis mimics these molecules with its two main compounds: cannabidiol (CBD) and THC (tetrahydrocannabinol), which interact directly with the body’s endocannabinoid system. 

Cannabis may interfere with the brain’s regulation of reproductive hormones, experts say. (iStock)

While THC can relieve pain or stimulate appetite, it also triggers the “high” that often leads to adverse side effects, like anxiety or paranoia, which have been widely documented in cannabinoid research.

When cannabis is consumed, external cannabinoids enter the body and bind to the same receptors as natural endocannabinoids, which may impair sperm quality and reproductive function, according to previous studies.

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Cannabis may interfere with the brain’s regulation of reproductive hormones, with some research suggesting it can alter levels of FSH (follicle-stimulating hormone) and LH (luteinizing hormone), which signal the testes to support sperm production.

This hormonal suppression could contribute to fertility challenges in some cases, though researchers noted that human evidence remains mixed and continues to be studied.

Potentially reversible

Men planning to conceive should stop using cannabis, experts recommend, as it can significantly impair sperm quality, with higher usage correlating to worse outcomes.

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Any negative effects may be reversible, as fertility can be improved when couples stop cannabis use, DeRoo noted.

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Experts recommend discontinuing cannabis use at least three months prior to conceiving to allow the body to generate a full cycle of healthy sperm.

Men planning to conceive should stop using cannabis, experts recommend, as it can significantly impair sperm quality. (iStock)

The American Society for Reproductive Medicine also encourages couples trying to conceive to avoid recreational drugs to maximize their chances of a healthy birth.

“Stopping the use of cannabis improves other areas of health in a person’s life, and conception or pregnancy can be a strong motivator for abstinence,” DeRoo added.

Cannabis use in the US

In 2021, nearly one in five Americans (52.5 million people) used cannabis, making it the most common federally illegal drug in the country, per CDC data.

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Statistics show that about 30% of users may develop cannabis use disorder at some point, which adversely impacts their daily activities.

Recreational cannabis is legal in roughly half of U.S. states, while medical marijuana is legal in a large majority (well over 30 states), according to the CDC. A small number of states still prohibit most forms of cannabis use.

Health

Popular weight-loss diet shows surprising impact on serious mental health condition

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Popular weight-loss diet shows surprising impact on serious mental health condition

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The keto diet may help individuals with anorexia nervosa, new research from UC San Diego School of Medicine suggests.

The small study, published in the journal Nature, enrolled 22 women between 18 and 45 years old who had a history of anorexia nervosa and a BMI (body mass index) above 17.5.

Anorexia nervosa (AN) is a severe psychiatric disorder involving food restriction and low body weight, the researchers describe. This is often followed by body dissatisfaction, an intense fear of eating, and a preoccupation with body shape and size even after weight restoration.

KETO DIET HAS SURPRISING IMPACT ON MENTAL HEALTH, RESEARCHERS DISCOVER

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The participants followed a ketogenic therapy plan for 14 weeks, aiming for a diet consisting of 70% fat, 20% protein and 10% carbohydrates, according to a press release.

The participants followed a ketogenic therapy plan for 14 weeks, aiming for a diet consisting of 70% fat, 20% protein and 10% carbohydrates. (iStock)

The goal was to maintain weight while inducing nutritional ketosis — a metabolic state in which the body produces and uses ketones for energy because carbohydrate intake is low enough to shift metabolism toward fat burning.

The researchers monitored the participants via ketone testing, weekly weight checks, symptom questionnaires, and nutritional and psychiatric support.

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Among the remaining 18 participants, eating disorder symptoms reportedly improved in several areas, including restraint, depression scores, and concern with eating, shape and weight.

Overall scores on the Eating Disorder Examination Questionnaire (EDE-Q) also improved, with 72% of participants scoring in the recovered or normal range.

Eating disorder symptoms reportedly improved in several areas, according to the study findings. (iStock)

The participants’ body weight did not change significantly, and no BMI fell below 17.5, according to the results.

Those who continued to follow ketogenic therapy three months after the intervention had slightly better EDE-Q scores.

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The study authors concluded that ketogenic dietary therapy is “well-tolerated” and demonstrated “potential efficacy” in reducing anorexia nervosa symptoms in adults who are mildly underweight or weight-restored.

Although the study was “sufficiently powered,” the authors noted that the small sample size of predominantly White females limits the scope of the findings.

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“Future research should replicate these findings in more diverse populations and incorporate objective assessments of brain function, such as metabolic PET imaging, to assess brain glucose metabolism,” they wrote.

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Those who continued to follow ketogenic therapy three months after the intervention had slightly better scores on the Eating Disorder Examination Questionnaire. (iStock)

Lead study author Guido Frank, MD, professor of psychiatry at the UC San Diego School of Medicine, who has studied and treated anorexia patients for more than 25 years, launched this study to broaden treatment options for this high-risk population.

Frank wrote in a statement that new approaches to anorexia nervosa are “urgently” needed.

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“Our work with ketogenic therapy looks beyond standard therapies and potentially at the underlying physiology of the disorder,” he went on.

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“Growing evidence links anorexia nervosa to neurometabolic dysfunction, and we are hopeful that direct metabolic intervention can regulate neural function and address the psychological symptoms patients experience.”

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New cancer vaccine delivers stunning result against one of the deadliest skin cancers

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New cancer vaccine delivers stunning result against one of the deadliest skin cancers

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A new injectable therapy is showing positive results in reducing melanoma throughout a five-year period.

The personalized mRNA cancer therapy, called intismeran autogene, combined with the cancer immunotherapy drug KEYTRUDA (pembrolizumab), is a collaboration between Merck and Moderna.

The results from the phase 2b KEYNOTE-942 study were presented at the American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago on May 27.

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After about a five-year follow-up, the combo drug was found to reduce the risk of melanoma recurrence or death by 49% compared to pembrolizumab alone.

The researchers analyzed data from 157 patients with high-risk stage 3 and 4 melanoma whose cancer had been removed via surgery. The participants were split into two groups — one received the combo therapy and the other only received pembrolizumab, according to a press release.

The therapy was found to reduce the risk of melanoma recurrence or death by 49% compared to pembrolizumab alone after a five-year follow-up. (iStock)

The findings revealed that the combination group saw benefits that were “sustained and durable over time.”

Intismeran autogene is designed using mutations identified in a patient’s own tumor, with the intention of teaching the immune system what the cancer looks like so that it can recognize and attack it.

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According to the researchers, intismeran is “well-tolerated” with a “manageable” safety profile. 

The most commonly cited side effects of the personalized mRNA vaccine plus KEYTRUDA were fatigue, injection-site pain, chills, fever and headache. The researchers reported no new long-term safety concerns and no severe vaccine-related adverse events.

The combination therapy is currently being evaluated in a phase 3 study — the final confirmation stage.

Patients with late-stage melanoma have a “significant risk” of cancer recurrence, according to an expert. (iStock)

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In a Merck press release from January, Kyle Holen, MD, Moderna’s senior vice president and head of development, oncology and therapeutics, noted that this data highlights the “potential of a prolonged benefit … in patients with resected high-risk melanoma.”

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“We continue to invest in our platform in oncology because of encouraging outcomes like these, which illustrate mRNA’s potential in cancer care,” he said.  

Dr. Marjorie Green, senior vice president and head of oncology, global clinical development at Merck Research Laboratories, also commented that for many patients with stage 3 or 4 melanoma, there is a “significant risk of recurrence following surgery.”

Researchers confirmed that the combination therapy is currently being evaluated in a phase 3 study. (iStock)

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“As such, demonstrating the longer-term potential of intismeran autogene and KEYTRUDA to reduce the risk of recurrence for certain patients with melanoma is a meaningful milestone,” she said.

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The company cited encouraging five-year follow-up data and pointed to upcoming late-stage INTerpath trial results with Moderna in several hard-to-treat cancers.

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New ways to prevent flu revealed in ‘accidental’ lab breakthrough, study finds

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New ways to prevent flu revealed in ‘accidental’ lab breakthrough, study finds

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An accidental lab discovery has opened the door to entirely new ways of preventing the flu.

While investigating how influenza replicates, researchers discovered that different flu strains use completely different strategies to infiltrate human cells, SWNS reported.

By targeting the specific molecules the viruses rely on, scientists found that they could block them from entering new cells and halt their replication altogether.

5 THINGS YOU NEED TO KNOW BEFORE GETTING YOUR FLU SHOT, ACCORDING TO DOCTORS

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Researchers say these “fundamental insights” into seasonal influenza highlight a clear path toward developing better preventive medications.

“The hope is that fundamental, curiosity-based research like this helps to pave the way for novel strategies to treat and prevent influenza infections,” principal investigator Dr. Emily Bruce, from the University of Vermont’s Larner College of Medicine, said in the SWNS report.

While investigating how influenza replicates, researchers discovered that different flu strains use completely different strategies to infiltrate human cells. (iStock)

While several flu strains cause illness, H1N1 and H3N2 influenza A viruses are the most common. However, current flu tests cannot differentiate between them, and clinical treatments are identical for both.

Although vaccines and antivirals are available, Bruce noted a “dire” need for better medications to stop the virus from spreading cell to xxcell.

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“You don’t get sick when a virus is in one cell,” he noted. “You get sick because a virus replicates itself and goes into many more cells.”

HOW LONG YOU’RE CONTAGIOUS WITH THE FLU — AND WHEN IT’S SAFE TO GO OUT

The study, which was published in The Journal of Virology, originally aimed to map how viral RNA segments are transported within cells to create new viral particles.

The team used H1N1 and H3N2 viruses isolated from the nasal passages of positive patients in 2022.

Clinical treatments remain identical for both primary strains of the flu virus. (iStock)

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During the investigation, the team unexpectedly stumbled upon a cellular pathway that blocked the virus from entering lung cells, SWNS reported.

RESEARCHERS LOCKED FLU PATIENTS IN A HOTEL WITH HEALTHY ADULTS — NO ONE GOT SICK

The data revealed that when a specific human protein called Rab11B was depleted, H3N2 viruses failed to enter human lung cells. H1N1 viruses were completely unaffected.

Using reverse genetics, the team mapped this defect and uncovered a brand-new, H3N2-specific role for Rab11B during viral entry.

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This discovery challenged the scientific assumption that all flu viruses enter cells the same way.

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“Viruses are like pirates from different countries hijacking someone’s ship,” Bruce said. “Different viruses, like different types of pirates, use different methods to get onboard.”

This discovery challenged the scientific assumption that all flu viruses enter cells the same way. (iStock)

“We had previously thought that all flu viruses used the same way to get into a cell, but we discovered that this is not true,” she went on. “H1N1 and H3N2 need different proteins to get in, and if you get rid of the right protein, a specific virus can’t get in.”

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While these findings identify a critical cellular pathway for viral entry, the study was conducted using isolated cells, the researchers acknowledged.

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Further research is needed to determine whether blocking the protein is safe and effective within a live, complex human respiratory system.

Bruce and the team hope to conduct further research to determine whether this Rab11B-dependency is a fundamental property of H3N2, or if it’s a trait unique to currently circulating flu strains.

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