Health
Man dies after consuming too much vitamin D, experts warn of risks: 'Cascade of problems'
Amid reports of a U.K. man’s death from high amounts of vitamin D, experts are warning about the dangers of unsafe levels.
After 89-year-old David Mitchener died last year from hypercalcemia, a build-up of calcium in the body that is caused by excess levels of vitamin D, the Surrey assistant coroner released a report urging regulatory agencies to warn consumers about the risk of excessive intake.
Michener was admitted to East Surrey Hospital on May 10, 2023, and died 10 days later. Tests revealed that his vitamin D levels were at the maximum recordable level, according to the report from Jonathan Stevens, the assistant coroner.
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Vitamin D toxicity was listed as one of the factors in Michener’s death, along with congestive heart failure, ischemic heart disease, chronic kidney failure and hypercalcemia.
“David Mitchener had been taking vitamin supplements for at least the preceding nine months,” the report stated.
Experts are warning about the dangers of unsafe levels of vitamin D after a U.K. man died of excessive consumption. (iStock)
The supplements he was taking did not have any warnings on or in the packaging detailing the specific risks or side effects, according to the report.
“Vitamin supplements can have potentially very serious risks and side effects when taken in excess,” Stevens, the assistant coroner, wrote.
“Current food labeling requirements do not require these risks and side effects to be written on the packaging.”
What is a safe level of vitamin D?
For healthy adults, 600 international units (IU) of vitamin D (15 mcg) per day is all that’s necessary, according to Pieter Cohen, associate professor of medicine at the Cambridge Health Alliance in Massachusetts.
“Usually, this can come from fortified foods and sunlight,” he told Fox News Digital.
Some foods that are high in vitamin D include orange juice, rainbow trout, salmon, portabella mushrooms, yogurt, tuna and milk, according to WebMD. (iStock)
Some foods that are high in vitamin D include orange juice, rainbow trout, salmon, portabella mushrooms, yogurt, tuna and milk, according to WebMD.
Healthy people should not be taking more than 4,000 IU (100 mcg) per day, Cohen advised.
“Taking more than that can cause a cascade of problems, as vitamin D acts as a hormone in the body and too much of it can lead to a number of issues,” he warned.
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“Overdosages occur with taking much more — usually 60,000 international units a day or more.”
The amount of vitamin D required in the diet can also vary by age, according to Dr. Maryann Amirshahi, professor of emergency medicine at Georgetown University and co-medical director of the National Capital Poison Center in Washington, D.C.
“Vitamin D acts as a hormone in the body and too much of it can lead to a number of problems.”
“Smaller amounts (400 IU) are recommended in the first year of life,” she told Fox News Digital.
“For children older than 1 year of age, adolescents and most adults, 600 IU a day is recommended. The dose is the same for people who are pregnant or lactating.”
For older adults over age 70, an intake of 800 IU per day is recommended.
Dangerously high levels of vitamin D are almost always caused by consuming excessive amounts from dietary supplements, the NIH stated. (iStock)
“Higher doses are also recommended for individuals with vitamin D deficiency, with larger doses required for more severe deficiency,” Amirshahi added.
One common mistake is that some vitamin D prescriptions are dosed once a week, but people may accidentally take them daily, which can lead to toxicity, the doctor warned.
Symptoms of vitamin D overdose
Consuming too much vitamin D can lead to any number of symptoms that can be difficult to distinguish from other conditions.
These may include thirst, excessive urination and nausea, Cohen said — “but they can also be much more ominous, such as getting confused and becoming quite weak.”
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The main effect of vitamin D in the body is that it increases calcium concentrations, according to Amirshahi.
“The signs and symptoms of vitamin D poisoning are similar to people who have elevated calcium concentrations for other reasons,” she said. “The symptoms of elevated calcium levels in the blood include confusion, nausea, vomiting, abdominal pain, frequent urination and dehydration.”
“Symptoms of elevated calcium levels in the blood include confusion, nausea, vomiting, abdominal pain, frequent urination and dehydration.” (iStock)
The National Institute of Health (NIH) warns that “very high levels of vitamin D in your blood (greater than 375 nmol/L or 150 ng/mL) can cause nausea, vomiting, muscle weakness, confusion, pain, loss of appetite, dehydration, excessive urination and thirst, and kidney stones.”
It adds, “Extremely high levels of vitamin D can cause kidney failure, irregular heartbeat and even death.”
Toxicity of a dose may vary depending on a variety of factors, such as underlying medical problems like kidney disease, Amirshahi noted.
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“Another important factor is how long an individual is taking large doses of vitamin D,” she said.
“Often, a single large dose (50,000 to 150,000 IU, depending on the size of the individual) is well-tolerated, but chronic overdose can be much more dangerous.”
Dangerously high levels of vitamin D are almost always caused by consuming excessive amounts from dietary supplements, the NIH stated on its website.
“Extremely high levels of vitamin D can cause kidney failure, irregular heartbeat and even death,” the NIH warned. (iStock)
“Vitamin D toxicity has been caused by consumption of dietary supplements that contained excessive vitamin D amounts because of manufacturing errors, that were taken inappropriately or in excessive amounts, or that were incorrectly prescribed by physicians,” according to the agency.
“You cannot get too much vitamin D from sunshine because your skin limits the amount of vitamin D it makes.”
Treatments for overdose
If someone has overdosed, the immediate treatment is to stop taking the vitamin and to restrict dietary calcium, according to Mayo Clinic.
Some doctors may also prescribe IV therapy and medications, including corticosteroids or bisphosphonates.
If someone has overdosed, some doctors may also prescribe IV therapy and medications, including corticosteroids or bisphosphonates. (iStock)
“We can give a dose of activated charcoal in the emergency department if someone took a large single dose of vitamin D to help bind it before it gets absorbed by the intestines,” said Amirshahi.
This is only helpful if the person comes in early and ingests a single large dose, however.
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“Once the vitamin D has been absorbed, the main treatment is to address the high calcium levels,” she said. “This could include administering intravenous fluids or giving medications that lower the calcium concentration.”
In severe cases when other measures don’t work, dialysis may be used to help remove the calcium.
Experts call for warnings
Because vitamin D is sold as a dietary supplement in the U.S., it is not approved by the Food and Drug Administration (FDA).
“Vitamin supplements can have potentially very serious risks and side effects when taken in excess,” one doctor said. “Current food labeling requirements do not require these risks and side effects to be written on the packaging.” (iStock)
“Supplements can be sold at almost any dose the manufacturer decides to use, and the manufacturer is not required to place warnings on even the highest doses of vitamin D that it is dangerous to take too much,” Cohen told Fox News Digital.
“Supplements are often poorly manufactured as well, and the dose on the label might not be accurate,” he warned.
“Research of vitamin D supplements in the U.S. has revealed that sometimes you can get too little or too much vitamin D in the pills.”
To help ensure the proper amount in each pill, Cohen recommends only purchasing vitamin D supplements that have been certified by either USP (United States Pharmacopeia) or NSF International.
Fox News Digital reached out to David Mitchener (the assistant coroner in Surrey) and East Surrey Hospital requesting additional comment.
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Feeling lonely may take a toll on older adults’ memory — but it may not speed up cognitive decline, according to a new study.
Researchers from Colombia, Spain and Sweden analyzed data from more than 10,000 adults ages 65 to 94 across 12 European countries and found those who reported higher levels of loneliness did worse on memory tests at the start of the study, according to research published this month in the journal Aging & Mental Health.
Over a seven-year period, however, memory decline occurred at a similar rate regardless of how lonely participants felt.
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“The finding that loneliness significantly impacted memory, but not the speed of decline in memory over time was a surprising outcome,” lead author Dr. Luis Carlos Venegas-Sanabria of the School of Medicine and Health Sciences at the Universidad del Rosario said in a statement.
Loneliness may be linked to memory performance in older adults, a new study suggests. (iStock)
“It suggests that loneliness may play a more prominent role in the initial state of memory than in its progressive decline,” Venegas-Sanabria said, adding that the findings highlight the importance of addressing loneliness as a factor in cognitive performance.
The findings add to debate about whether loneliness contributes to dementia risk. While loneliness and social isolation are often considered risk factors for cognitive decline, research results have been mixed.
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The study looked at data from the long-running Survey of Health, Ageing and Retirement in Europe (SHARE), which tracked 10,217 older adults between 2012 and 2019. Participants were asked to recall words immediately and after a delay to measure memory performance.
Social isolation and loneliness could play a surprising role in cognitive health among seniors. (iStock)
Loneliness was assessed using three questions about how often participants felt isolated, left out or lacking companionship.
About 8% of participants reported high levels of loneliness at the outset. That group tended to be older, more likely to be female and more likely to have conditions such as depression.
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Researchers found that those with higher loneliness had lower scores on both immediate and delayed memory tests at baseline. Still, all groups — regardless of loneliness level — experienced similar declines in memory over time.
The results suggest loneliness may not directly accelerate the progression of memory loss, though it remains linked to poorer cognitive performance overall.
Researchers look at a brain scan at the National Institutes of Health in Bethesda, Maryland. (Saul Loeb/AFP/Getty Images)
Experts warn, however, that the findings should not be interpreted to mean loneliness is harmless.
“The finding that lonely older adults start with worse memory but don’t decline faster is actually the most interesting part of the paper, and I think it’s easy to misread,” said Jordan Weiss, Ph.D., a scientific advisor and aging expert at Assisted Living Magazine and a professor at NYU Grossman School of Medicine.
“It likely means loneliness does its damage earlier in life, well before people show up in a study like this at 65-plus,” Weiss told Fox News Digital.
By older age, long-term social patterns may already be established, making it harder to detect when the effects of loneliness first took hold, an aging expert says. (iStock)
He suggested that by older age, long-term social patterns may already be established, making it harder to detect when the effects of loneliness first took hold.
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“By the time you’re measuring someone in their late 60s, decades of social connection patterns are already baked in,” he said.
Weiss, who was not involved in the research, added that loneliness may coincide with other health conditions, and noted that participants who felt more isolated also had higher rates of depression, high-blood pressure and diabetes. The link, he said, may reflect a cluster of health risks rather than a direct cause.
“While they can go hand-in-hand, it’s not clear that loneliness contributes to dementia,” a psychotherapist says. (iStock)
Amy Morin, a Florida-based psychotherapist and author, said the findings reflect a broader pattern in research on loneliness and brain health, and that the relationship may be more complex than it appears.
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“The evidence shows there’s a link between loneliness and cognitive decline but there’s no direct evidence of a cause and effect relationship,” she said. “So while they can go hand-in-hand, it’s not clear that loneliness contributes to dementia.”
Morin added that loneliness, which can fluctuate, may not be the root of the problem, but rather a symptom of other underlying mental or physical health issues.
Researchers suggested screening for loneliness be incorporated into routine cognitive assessments as one way to support healthy aging. (iStock)
She said staying socially and mentally engaged is crucial for overall brain health.
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“It’s important to be proactive about social activities,” Morin said. “Joining a book club, having coffee with a friend, or attending faith-based services can be a powerful way to maintain connections in older age.”
The researchers also suggested screening for loneliness be incorporated into routine cognitive assessments as one way to support healthy aging.
Fox News Digital reached out to the researchers for comment.
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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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