Health
Popular vitamin D supplement may have an unexpected effect, experts warn
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Vitamin D is known to be essential to many aspects of human health — but a new study suggests that taking a certain form of it can have a negative effect.
The more potent and longer-lasting form, vitamin D3 (cholecalciferol) is produced naturally when the body is exposed to sunlight and is also found in animal products, while vitamin D2 (ergocalciferol) comes from plant or fungal sources, per the National Institutes of Health.
Researchers from the University of Surrey in the U.K. found that taking vitamin D2 can cause reduced levels of vitamin D3 in the body.
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They made this determination by analyzing 11 randomized controlled trials including 655 adults, which showed that people taking vitamin D2 supplements had less vitamin D3 than those who did not take D2, according to a university press release.
The findings of the study — conducted along with the John Innes Centre and the Quadram Institute Bioscience in Norwich, England — were published in the journal Nutrition Reviews.
Vitamin D is known to be essential to human health — but a new study suggests that taking a certain form of it can have a negative effect. (iStock)
“Vitamin D supplements are important, especially between October and March, when our bodies cannot make vitamin D from sunlight in the U.K.,” lead researcher Emily Brown, a Ph.D. research fellow from the University of Surrey’s Nutrition, Exercise, Chronobiology & Sleep Discipline, stated in the press release.
“However, we discovered that vitamin D2 supplements can actually decrease levels of vitamin D3 in the body, which is a previously unknown effect of taking these supplements. This study suggests that, subject to personal considerations, vitamin D3 supplements may be more beneficial for most individuals over vitamin D2.”
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Previous research has suggested that the two forms of vitamin D are not interchangeable. A study published in Frontiers in Immunology, also conducted by the University of Surrey, found that vitamin D3 is more effective in boosting the immune system and protecting the body from viral and bacterial diseases, the release noted.
Some foods containing vitamin D3 include fatty fish, egg yolks, cod liver oil and fortified dairy and animal foods, health sources confirm. (iStock)
“We have shown that vitamin D3, but not vitamin D2, appears to stimulate the type I interferon signaling system in the body – a key part of the immune system that provides a first line of defense against bacteria and viruses,” stated Professor Colin Smith, who led the above study. “Thus, a healthy vitamin D3 status may help prevent viruses and bacteria from gaining a foothold in the body.”
Professor Martin Warren, chief scientific officer at the Quadram Institute, confirmed in the release that vitamin D deficiency is a “significant public health concern,” particularly during the winter months.
“This collaborative research effort aligns well with the Quadram Institute’s mission to deliver healthier lives through food innovation to enhance the nutrient density of the food we eat,” he said. “Tackling this with the most effective form of vitamin D supplementation or fortification is of the utmost importance to the health of the nation.”
More research is needed to determine whether vitamins D2 and D3 affect the body differently — and whether that could change doctors’ medical advice on which type to take, the researchers concluded. (iStock)
More research is needed to determine whether vitamins D2 and D3 affect the body differently — and whether that could change doctors’ medical advice on which type to take, the researchers concluded.
There were several limitations to the analysis, the study findings noted.
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For example, there were only a small number of studies with many differences among them, such as their duration, the amount and timing of doses, and how results were measured. There was also the potential for biases due to incomplete reporting of details.
The results could also be affected by factors such as the amount of sunlight exposure, as well as some people taking supplements and others eating vitamin-fortified foods, the researchers noted.
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Some foods containing vitamin D3 include fatty fish, egg yolks, cod liver oil and fortified dairy and animal foods, health sources confirm. Vitamin D2 can be found in mushrooms, fortified foods and some plant/fungal-based supplements.
The study was supported by the Biotechnology and Biological Sciences Research Council (BBSRC).
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Research continues to uncover new details on how fasting may help extend life.
A new study published in the journal Nature Communications investigated how intermittent fasting can boost longevity in small worms often used in aging research.
Researchers from the University of Texas Southwestern Medical Center in Dallas compared worms that were fed normally to those that underwent a 24-hour fast in early adulthood and were then fed again, according to a press release.
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The scientists measured a variety of factors, including stored fat, gene activity related to fat metabolism and lifespan.
The results showed that the life-boosting benefit did not depend on the fasting itself but on the body’s behavior after eating again.
Experts say sustainability is key when choosing a long-term weight-loss strategy. (iStock)
Study lead Peter Douglas, associate professor of molecular biology and a member of the Hamon Center for Regenerative Science and Medicine at UT Southwestern, suggested that these discoveries “shift the focus toward a neglected side of the metabolic coin – the re-feeding phase.”
“Our data suggest that the health-promoting effects of intermittent fasting are not merely a product of the fast itself, but are dependent on how the metabolic machinery recalibrates during the subsequent transition back to a fed state,” he said.
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“Our findings bridge a gap between lipid metabolism and aging research,” he added. “By targeting aging, the single greatest risk factor for human disease, we move beyond treating isolated conditions toward a preventive model of medicine that enhances quality of life for all individuals.”
Lauri Wright, director of nutrition programs at the University of South Florida’s College of Public Health, called this a “high-quality” study that adds an “important nuance to how we think about fasting and longevity.”
Intermittent fasting typically involves limiting meals to an eight-hour daily window or fasting every other day. (iStock)
The benefits of the refeeding phase after fasting were “especially interesting,” Wright, who was not involved in the study, told Fox News Digital.
“The researchers showed that longevity was linked to the body’s ability to turn off fat breakdown after fasting, allowing cells to restore energy balance,” she reiterated.
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“From a scientific standpoint, that’s a meaningful shift because it suggests fasting is not just about burning fat, but about metabolic flexibility.”
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Fasting may support longevity through triggering metabolic switching, enhancing cellular repair and stress resistance and improving markers like insulin sensitivity, research shows.
Limitations and cautions
Although this study provides “important insight” on the power of refeeding, Wright noted that the findings should be approached with caution, as the study was done on worms and cannot always be translated to humans.
“Additionally, it explains how a process might work in a controlled lab condition rather than real-world eating behaviors,” she added as a limitation. “Finally, the study is short-term and doesn’t give us the long-term translation on lifespan outcomes.”
The review found intermittent fasting was barely more effective than doing nothing, according to the study authors. (iStock)
Wright cautioned that fasting is “not a magic solution for longevity, and how you eat overall matters more than when you eat.”
“I advise, first and foremost, to focus on diet quality, including a variety of fruits and vegetables, healthy fats and minimally processed foods,” she said.
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For those who are considering fasting, it’s better to stick with a moderate plan — like a 12- to 14-hour overnight fast — rather than going to extremes, Wright said. After fasting, she recommends focusing on well-balanced meals.
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Several groups of people should be cautioned against fasting, according to Wright, including those with diabetes who are on insulin or hypoglycemic medications, those who are pregnant or breastfeeding, anyone with a history of eating disorders and older adults at risk of malnutrition.
Anyone considering intermittent fasting should consult with a doctor before starting.
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More than three million people travel to undergo cosmetic surgery each year, statistics show — but the potential savings come at a cost.
Most people opting to pursue this so-called “medical tourism” are chasing budget-friendly price tags.
International surgeries, such as hair transplants in Turkey, can cost as little as $4,000 to $5,000 compared to $20,000 to $30,000 in the U.S., but often come with extreme risks, according to board-certified plastic surgeon Dr. Sheila Nazarian of California.
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The doctor recently joined Lisa Brady on the “The FOX News Rundown” podcast to discuss the rising trend of medical tourism. One of the biggest risks, she said, is the lack of safety regulations in popular destinations like Mexico and Turkey.
As demand spikes in these medical tourism “mills,” there have been reports of non-medically trained staff performing procedures like hair transplants.
Most people opting to pursue “medical tourism” are chasing budget-friendly price tags. (iStock)
“I’ve heard that they [international clinics] are even recruiting people who maybe were taxi drivers and then putting them through their own training program … to become hair transplant technicians,” Nazarian said. “That’s how high the demand has become.”
In the U.S., medical school graduates are granted a “physician and surgeon” license, which means doctors — including pediatricians or OB-GYNs — can legally perform cosmetic surgeries, even if they didn’t receive specialized training for those procedures during residency, Nazarian noted.
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Instead of pinching pennies, the doctor recommended paying whatever amount is necessary to ensure quality treatment.
“People think of it as, you know, going to the mall. … It’s surgery, and surgery has risks,” she said. “You need to be with someone who not only can perform a beautiful surgery, but who can handle possible complications well.”
“You need to ask them: ‘What was your residency training in? And if you wanted to, would you be allowed to do this procedure in a hospital?’”
Aftercare is another critical factor in the success and safety of a cosmetic procedure, as the doctor emphasized that 20% of a surgical result depends on post-operative care.
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This can be difficult or even impossible to manage when a doctor is in a different time zone, she cautioned, or if the clinic disappears shortly after the procedure.
Nazarian also noted the importance of addressing the psychological component of plastic surgery, noting that no procedure will fix underlying unhappiness. The doctor said she uses screening questionnaires to ensure that patients are truly seeking self-improvement rather than a “cure” for deeper issues.
International surgeries, such as hair transplants in Turkey, can cost as little as $4,000 to $5,000 compared to $20,000 to $30,000 in the U.S., but often come with extreme risks. (iStock)
“If you’re not already generally very content with your life, a knife in my hand is not going to bring you there,” Nazarian said.
“The analogy I always give is you don’t want a paisley couch — you want a neutral couch and you can put paisley pillows on it,” she said, noting that a procedure should “make you look normal, God-given, athletic. And then you can change your clothes when the trends come and go.”
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Samuel Golpanian, M.D., a double board-certified plastic surgeon in Beverly Hills, said he has also seen an increasing number of patients undergoing cosmetic procedures abroad, sometimes with “devastating consequences.”
“The key is being extremely careful before embarking on this journey.”
“I’ve seen a wide range of complications, including infections, poor wound healing, significant scarring and tissue necrosis (skin death),” he told Fox News Digital. “These complications often lead to prolonged pain, ongoing medical problems, and significant additional costs to repair the damage.”
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Golpanian said he’s treated patients who received unsafe or non-medical-grade injectable materials, which can lead to serious long-term health issues.
One surgeon said he’s treated patients who received unsafe or non-medical-grade injectable materials, which can lead to serious long-term health issues. (iStock)
“I’ve also seen damage to underlying structures, asymmetry and results that are extremely difficult — sometimes impossible — to correct.”
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“That said, I’ve also seen some good outcomes, so it’s not all bad,” he noted. “The key is being extremely careful before embarking on this journey.”
Quick tips for safe ‘medical tourism’
Fully vet the surgeon. “Most surgeons will provide information about their education and training, but it’s important not to accept these claims at face value,” Golpanian said. “Verify them directly by contacting the institutions where they trained.”
Ask for references from prior patients. Ideally, it’s best to get references from U.S.-based patients who can speak candidly about both their experience and their results, the surgeonsaid.
Think beyond the cost. Golpanian emphasized the adage “you get what you pay for.” “Cost should take a back seat to experience, training, judgment and proven results,” he advised.
Be cautious about relying on before-and-after photos. These can be selective or even enhanced, Golpanian warned.
Keep aftercare in focus. “Make sure the practice emphasizes comprehensive follow-up care and has a clear, realistic post-operative plan in place.”
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