Health
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.
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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.
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.
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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.
“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.
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
Former reality star opens up about new diagnosis after years-long health ordeal
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A former “Real Housewives of Beverly Hills” star is speaking out about a fresh wave of health issues.
Brandi Glanville, 53, has been speaking publicly about ongoing swelling, lumps and paralysis of her face since 2023.
At the time, the reality star shared that she believed she had been infected with a parasite during a trip to Morocco, Fox News Digital previously reported.
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After the initial diagnosis, she suspected she contracted a parasite in Morocco and said she could feel it moving within her face.
Brandi Glanville attends the grand opening of Beverly Hills Rejuvenation Clinic West Hollywood in West Hollywood, Calif., on April 25, 2024. (Paul Archuleta/Getty Images)
Glanville was first diagnosed with stress-induced angioedema, a sudden swelling of the deeper layers of the skin and mucous membranes, according to Cleveland Clinic.
Angioedema “is a reaction similar to hives that affects deeper layers of the skin. It can appear with hives or alone,” Mayo Clinic states.
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Most recently, in a June 18 episode of her podcast “Brandi Glanville Unfiltered,” Glanville revealed that doctors discovered a “benign tumor” in one of her facial lymph nodes.
The reality star, who has previously speculated that a parasite may be contributing to her facial symptoms, said the finding could help explain the swelling and fluid buildup she has experienced and noted that she has had a lump in her face for “years.”
Brandi Glanville, 53, has been speaking publicly about ongoing swelling, lumps and paralysis of her face since 2023. (Mega/GC Images)
“I don’t know what’s wrong with me, guys. I thought I was fixed, and then it happened again and now it’s sinking in again,” Glanville said in another June podcast.
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“It could be why the fluid is going around my face and why I’m having a hard time,” she added.
While benign tumors of the face have been known to arise from fat tissue, blood vessels, skin structures, salivary glands or lymphatic tissue, Glanville has not publicly disclosed the specific type of diagnosis she received.
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Prior to learning of the tumor, Glanville said she saw dozens of doctors and spent over $100,000 trying to pinpoint the source of the issue.
Brandi Glanville shares images of painful facial burns caused by Nair hair removal cream in a viral TikTok video. (Brandi Glanville/TikTok)
The reality star emphasized that the tumor is “not cancerous.”
“I haven’t had a face lift yet!” she added.
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Glanville also said she suspected her ruptured breast implants could have played a role in her health issues, claiming the leaking silicone had clogged her lymph nodes.
Fox News Digital reached out to Glanville for comment.
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Health
One common type of fat may increase diabetes risk, while another helps fight it
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A new review suggests that the type of fat you eat may affect your risk of developing type 2 diabetes.
Saturated fats rich in palmitic acid – the most common saturated fatty acid in U.S. foods – appear to make it harder for the body to respond to insulin.
Meanwhile, monounsaturated fats rich in oleic acid — such as those found in olive oil — may help protect against insulin resistance, the review concluded.
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“Palmitic acid is found in meats, dairy products, cocoa butter and in the form of palm oil in foods, including margarine, cereal, sweets, baked goods and fast foods,” Tanya Freirich, a registered dietitian nutritionist in Charlotte, North Carolina, told Fox News Digital. She was not involved in the review.
“Oleic acid, on the other hand, is in higher concentration in foods like olive oil, canola oil, nuts, sunflower seeds, eggs, olive, avocados and also in meats (beef, chicken, pork), milk, cheese and pasta.”
Saturated fats rich in palmitic acid – the most common saturated fatty acid in U.S. foods – appear to make it harder for the body to respond to insulin. (iStock)
The review, which was published in the journal Trends in Endocrinology & Metabolism, was led by researchers from the University of Barcelona and the CIBER Area for Diabetes and Associated Metabolic Diseases (CIBERDEM) in Spain.
The findings suggest that fat quality may be more important than total fat quantity when it comes to metabolic health and diabetes risk.
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This appears to support the idea that diets rich in monounsaturated fats, such as the Mediterranean diet, may contribute to lower rates of type 2 diabetes.
“Palmitic acid promotes several molecular processes that impair insulin action,” study investigator Dr. Manuel Vázquez-Carrera, from the Department of Pharmacology, Toxicology and Therapeutic Chemistry at the University of Barcelona, told Fox News Digital.
“Palmitic acid is found in meats, dairy products, cocoa butter and in the form of palm oil in foods, including margarine, cereal, sweets, baked goods and fast foods,” a nutritionist said. (iStock)
Too much palmitic acid can cause harmful fat byproducts to build up in the body, which can impair the body’s ability to respond to insulin, he warned. This makes it harder to control blood sugar and increases the risk of insulin resistance and type 2 diabetes.
“It also promotes inflammation, oxidative stress, mitochondrial dysfunction and cellular stress responses, which contribute to insulin resistance and β-cell dysfunction,” Vázquez-Carrera added.
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By contrast, oleic acid – a hallmark of the Mediterranean diet – does not have these harmful effects, according to the researcher.
“In fact, oleic acid can counteract many of the detrimental effects triggered by palmitic acid, by promoting the storage of fatty acids in relatively inert triglycerides, preserving mitochondrial function and reducing inflammation,” he said.
“All sources of fat in our diet contain a mix of saturated and unsaturated fatty acids.”
Freirich confirmed that the review is consistent with previous research supporting the use of olive oil in the diet for metabolic benefits.
“Also confirming previous research, the consumption of saturated fats is associated with some negative metabolic changes,” she told Fox News Digital.
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Given the complexity of foods and diets, there is an overlap between foods that contain both types of fatty acids, the nutritionist noted.
“Palmitic acid and oleic acid can both be found in olive oil, baked goods and fast foods, in differing amounts,” she said. “All sources of fat in our diet contain a mix of saturated and unsaturated fatty acids.”
Study limitations
Vázquez-Carrera noted that these findings come from a review of numerous experimental, clinical and epidemiological studies rather than a single clinical trial.
“One important limitation is that much of the mechanistic evidence comes from cell culture and animal studies,” he said.
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“Although these studies provide valuable insights into how specific fatty acids affect insulin signaling, further human intervention studies are needed to confirm the extent to which these mechanisms operate in everyday dietary settings.”
In addition, many of the human studies in the review relied on self-reported dietary intake, which can introduce inaccuracies.
Type 2 diabetes develops over many years, with genetics, lifestyle and environmental factors all playing a role, the researcher noted. (iStock)
“Another challenge is that people consume foods containing complex mixtures of fatty acids and bioactive compounds rather than isolated fatty acids,” Vázquez-Carrera added. “Therefore, it remains difficult to fully disentangle the specific contribution of individual fatty acids in free-living populations.”
Nutritional recommendations
The review’s findings appear to support current dietary recommendations that emphasize replacing part of the saturated fat intake with unsaturated fats, according to Vázquez-Carrera.
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“This means favoring dietary patterns rich in foods such as extra-virgin olive oil, nuts, seeds, legumes, vegetables, fruits and fish, while limiting excessive consumption of foods rich in saturated fats, especially highly processed foods,” he advised.
The review does not suggest that a single nutrient alone determines diabetes risk, the researcher pointed out.
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“Rather, maintaining a healthy body weight, engaging in regular physical activity and following an overall healthy dietary pattern, such as the Mediterranean diet, remain fundamental strategies for preventing insulin resistance and type 2 diabetes.”
Type 2 diabetes develops over many years, with genetics, lifestyle and environmental factors all playing a role, Vázquez-Carrera noted.
Improving the quality of dietary fat intake could prove to be an effective strategy for reducing type 2 diabetes risk, the review suggests. (iStock)
“Future research should move beyond simply classifying fats as ‘good’ or ‘bad’ and instead focus on understanding how specific fatty acids, their dietary sources and their interactions within whole dietary patterns affect metabolic health,” he said.
Improving the quality of dietary fat intake could prove to be an effective strategy for reducing type 2 diabetes risk, according to the researcher.
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“A simple takeaway for consumers is to swap out foods high in saturated fat more often with foods rich in heart-healthy fats, like olive oil, nuts and avocados, to better support blood sugar and metabolic health,” advised New Jersey-based registered dietitian Erin Palinski-Wade, who was also not involved in the review.
Anyone at a higher risk for type 2 diabetes should consult a healthcare provider for personalized guidance on nutrition, exercise and other preventive measures, experts say.
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