The Link Between Introversion & Sensory Processing
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We’ve talked before about how to beat loneliness and isolation, and how that’s important for all of us, including those of us on the less social end of the scale.
However, while we all need at least the option of social contact in order to be at our best, there’s a large portion of the population who also need to be able to retreat to somewhere quiet to recover from too much social goings-on.
Clinically speaking, this sometimes gets called introversion, or at least a negative score for extroversion on the “Big Five Inventory”, the only personality-typing system that actually gets used in science. Today we’re going to be focusing on a term that typically gets applied to those generally considered introverts:
The “highly sensitive person”
This makes it sound like a very rare snowflake condition, when in fact the diagnostic criteria yield a population bell curve of 30:40:30, whereupon 30% are in the band of “high sensitivity”, 40% “normal sensitivity” and the remaining 30% “low sensitivity”.
You may note that “high” and “low” together outnumber “normal”, but statistics is like that. It is interesting to note, though, that this statistical spread renders it not a disorder, so much as simply a description.
You can read more about it here:
Sensory-processing sensitivity and its relation to introversion and emotionality
What it means in practical terms
Such a person will generally seek solitude more frequently during the day than others will, and it’s not because of misanthropy (at least, statistically speaking it’s not; can’t speak for individuals!), but rather, it’s about needing downtime after what has felt like too much sensory processing resulting:
If this need for solitude is not met (sometimes it’s simply not practicable), then it can lead to overwhelm.
Sidenote about overwhelm: pick your battles! No, pick fewer than that. Put some back. That’s still too many 😜
Back to seriousness: if you’re the sort of person to walk into a room and immediately do the Sherlock Holmes thing of noticing everything about everyone, who is doing what, what has changed about the room since last time you were there, etc… Then that’s great; it’s a sign of a sharp mind, but it’s also a lot of information to process and you’re probably going to need a little decompression afterwards:
This is the biological equivalent of needing to let an overworked computer or phone cool down after excessive high-intensity use of its CPU.
The same goes if you’re the sort of person who goes into “performance mode” when in company, is “the life and soul of the party” etc, and/or perhaps “the elegant hostess”, but needs to then collapse afterwards because it’s more of a role you play than your natural inclination.
Take care of your battery
To continue the technological metaphor from earlier, if you repeatedly overuse a device without allowing it cooldown periods, it will break down (and if it’s a certain generation of iPhone, it might explode).
Similarly, if you repeatedly overuse your own highly sensitive senses (such as being often in social environment where there’s a lot going on) without allowing yourself adequate cooldown periods, you will break down (or indeed, explode: not literally, but some people are prone to emotional outbursts after bottling things up).
None of this is good for the health, not in the short term and not in the long term, either:
With that in mind, take care to take care of yourself, meeting your actual needs instead of just those that get socially assumed.
Want to take the test?
Here’s a two-minute test (results available immediately right there on-screen; no need to give your email or anything) 😎
Want to know more?
We reviewed this book about playing to one’s strengths in the context of sensitivity, a while back, and highly recommend it:
Sensitive – by Jenn Granneman and Andre Sólo
Enjoy!
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Surviving with Beans And Rice – by Eliza Whool
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If you’d like to be well-set the next time a crisis shuts down supply lines, this is one of those books you’ll want to have read.
Superficially, “have in a large quantity of dried beans and rice” is good advice, but obvious. Why a book?
Whool gives a lot of advice on keeping your nutrition balanced while subsisting on the same quite few ingredients, which is handy.
More than that, she offers 100 recipes using the ingredients that will be in your long-term pantry. That’s over three months without repeating a meal! And if you don’t think rice and beans can be tasty and exciting and varied, then most of the chefs of the Global South might want to have a word about that.
Anyway, we’re not here to sell you rice and beans (we’re just enthusiastic and correct). What we are here to do is to give you a fair overview of this book.
The recipes are just-the-recipes, very simple clear instructions, one two-page spread per recipe. Most of the book is devoted to these. As a quick note, it does cover making things gluten-free if necessary, and other similar adjustments for medical reasons.
The planning-and-storage section of the book is helpful too though, especially as it covers common mistakes to avoid.
Bottom line: this is a great book, and remember what we said about doing the things now that future you will thank you for!
Get yourself a copy of Surviving with Beans And Rice from Amazon today!
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Mimosa For Healing Your Body & Mind
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Today we’re looking at mimosa (no relation to the cocktail!), which is a name given to several related plant species that belong to the same genus or general clade, look similar, and have similar properties and behavior.
As a point of interest that’s not useful: mimosa is one of those plants whereby if you touch it, it’ll retract its leaves and shrink away from you. The leaves also droop at nighttime (perfectly healthily; they’re not wilting or anything; this too is just plant movement), and spring back up in the daytime.
So that’s what we mean when we say “and behavior” 😉
Antidepressant & anxiolytic
Mimosa bark and leaves have long been used in Traditional Chinese Medicine, as well as (albeit different species) in the North-East of Brazil, and (again, sometimes different species) in Mexico.
Animal studies, in vivo studies, and clinical practice in humans, have found this to be effective, for example:
❝[Mimosa pudica extract] has anti-anxiety, anti-depressant and memory enhancing activities that are mediated through multiple mechanisms❞
Source: Effects of Mimosa pudica L. leaves extract on anxiety, depression and memory
Research is ongoing with regard to how, exactly, mimosa does what it does. Here’s a paper about another species mimosa:
(notwithstanding the genus name, it’s still part of the mimosa clade)
Anti-inflammatory & analgesic
In this case, mimosa has traditionally been used as a topical tincture (for skin damage of many kinds, ranging from cuts and abrasions to burns to autoimmune conditions and more), so what does the science say about that?
❝In summary, the present study provided evidence that the [mimosa extract], its fractions and the isolated compound sakuranetin showed significant anti-inflammatory and antinociceptive activities❞
Wound healing
About those various skin damages, here’s another application, and a study showing that it doesn’t just make it feel better, it actually helps it to heal, too:
❝Therapeutic effectiveness occurred in all patients of the extract group; after the 8th treatment week, ulcer size was reduced by 92% as mean value in this group, whereas therapeutic effectiveness was observed only in one patient of the control group (chi(2), p=0.0001). No side effects were observed in any patient in either group.❞
Very compelling stats!
Read more: Therapeutic effectiveness of a Mimosa tenuiflora cortex extract in venous leg ulceration treatment
Is it safe?
Yes, for most people, with some caveats:
- this one comes with a clear “don’t take if pregnant or breastfeeding” warning, as for unknown reasons it has caused a high incidence of fetal abnormalities or fetal death in animal studies.
- while the stem bark (the kind used in most mimosa supplements and most readily found online) has negligible psychoactivity, as do many species of mimosa in general, the root of M. tenuiflora has psychedelic effects similar to ayahuasca if taken orally, for example as a decoction, if in the presence of a monoamine oxidase inhibitor (MAOI), as otherwise MAO would metabolize the psychoactive component in the gut before it can enter the bloodstream.
That’s several “ifs”, meaning that the chances of unwanted psychedelic effects are slim if you’re paying attention, but as ever, do check with your doctor/pharmacist to be sure.
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon 😎
Enjoy!
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Healing Trauma – by Dr. Peter Levine
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Dr. Levine’s better-selling book about trauma, Waking The Tiger, laid the foundations for this one, but the reason we’re skipping straight into Healing Trauma, is that while the former book is more about the ideas that led him to what he currently believes is the best approach to healing trauma, this book is the one that explains how to actually do it.
The core thesis is that trauma is a natural, transient response, and is not inherently pathological, but that it can become so if not allowed to do its thing.
This book outlines exercises, trademarked as “somatic experiencing”, which allow the body to go through the physiological processes it needs to, to facilitate healing. If you buy the physical book, there is also an audio CD, which this reviewer has not listened to and cannot comment on, but the exercises are clearly described in the book in any case.
The physical aspects of the exercises are similar to the principles of progressive relaxation, while the mental aspects of the exercises are about re-experiencing trauma in a safer fashion, in small doses.
Any kind of dealing with trauma is not going to be comfortable, so this book is not an enjoyable read.
As for how useful the exercises are, your mileage may vary. Like many books about trauma, the expectation is that once upon a time you were in a situation that was unsafe, and now you are safe. If that describes your trauma, you will get the most out of this. However, if your trauma is unrelated to your personal safety, or if it is about your personal safety but the threat still remains extant, then a lot of this may not help and may even make things worse.
In terms of discussing sexual trauma specifically, it was probably not a good choice to favorably quote Woody Allen, and little things like that may be quite jarring for a lot of readers.
Bottom line: if your trauma is PTSD of the kind “you faced an existential threat and now it is gone”, then chances are that this book can help you a lot. If your trauma is different, then your mileage may vary widely on this one.
Click here to check out Healing Trauma, if it seems right for you!
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What is silicosis and what does research say about it?
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Silicosis is a progressive, debilitating and sometimes fatal lung disease caused by breathing silica dust from cutting, drilling, chipping or grinding materials such as granite, sandstone, slate or artificial stone. The dust gets trapped in the lung tissue, causing inflammation, scarring and permanent damage.
Silicosis is a job-related lung disease and has no cure. The disease mostly affects workers in construction, stone countertop fabrication, mining, and even those who sandblast and stonewash denim jeans to create a ‘worn out’ look.
Silica is one of the most common minerals in nature. About 59% of the Earth’s crust is made of silica, found in quartz, granite, sandstone, slate and sand. Historically, people at the highest risk for the disease have worked in natural environments — mining, digging tunnels or doing quarry work. The disease was first documented by the Greek physician Hippocrates, who in 430 B.C. described breathing disorders in metal diggers.
But in recent decades there’s been renewed attention to the disease due to its more rapid progression and severity among younger workers. Research has shown that the culprit is artificial stone mostly used for countertops for kitchens and bathrooms, which has a very high silica content.
The new generation of coal miners is also at an increased risk of silicosis, in addition to black lung, because layers of coal have become thinner, forcing them to dig deeper into rock, as explained in a joint investigation by the Pittsburgh Post-Gazette and the Medill Investigative Lab at Northwestern University published on Dec. 4. CBS Sunday Morning also had a report on the same issue among West Virginia coal miners, aired as part of its Dec. 10 episode.
Silicosis in modern industries
Artificial, or engineered, stone used for countertops, also known as “quartz,” is formed from finely crushed rocks mixed with resin. Quartz is a natural mineral, but man-made products like many quartz countertops consist of not just quartz, but also resin, colors and other materials that are used to style and strengthen them.
The silica content of artificial stone is about 90%, compared with the 3% silica content of natural marble and 30% silica content in granite stones, according to the authors of a 2019 systematic review published in the International Journal of Environmental Research and Public Health.
The first reported case of silicosis associated with working with artificial stone was from Italy in 2010, according to a 2020 study published in Allergy. Since then, more studies have documented the growing number of cases among artificial stone workers, many of whom are from marginalized populations, such as immigrants.
A July 2023 study published in JAMA Internal Medicine found that in California, the disease mainly occurred among young Latino immigrant men. The disease was severe in most men by the time they sought care.
An August 2022 study, published in Occupational & Environmental Medicine, analyzing the Global Silicosis Registry, with workers in Israel, Spain, Australia and the U.S., found “a substantial emerging population of workers worldwide with severe and irreversible silica-associated diseases,” due to exposure from silica dust from engineered stone.
Other modern occupations such as denim sandblasting, work on dental prostheses, manufacturing of electrical cables and working on jewelry and semi-precious stones also put workers at risk of silicosis.
In the wake of modern-day silicosis cases, researchers have called for larger studies to better understand the disease and the discovery of effective treatments.
In the U.S. about 2.3 million workers are exposed to silica dust on the job, according to the American Lung Association. Other estimates show approximately 10 million workers in India, 3.2 million in the European Union and 2 million in Brazil work with material containing silica.
However, “the reporting system for occupational injuries and illnesses in the United States fails to capture many cases, leading to a poor understanding of silicosis incidence and prevalence,” writes Ryan F. Hoy, who has published extensively on the topic, in a June 2022 article in Respirology.
A 2015 study in the Morbidity & Mortality Weekly Report found the annual number of silicosis deaths declined from 185 people in 1999 to 111 in 2013, but the decline appeared to have leveled off between 2010 and 2013, the authors write. Another 2015 study in MMWR, examining silicosis deaths between 2001 and 2010, found the death rate from silicosis was significantly higher among Black people compared with whites and other races. Men also have a significantly higher death rate from silicosis than women.
The 2019 Global Burden of Disease Study estimates that more than 12,900 people worldwide die from silicosis each year.
Silicosis has no cure, but it’s preventable when workers have access to proper respiratory protection and are educated on safe practices set by regulatory bodies such as the U.S. National Institute for Occupational Safety and Health. The European Network on Silica also has guidelines on handling and using materials containing silica. A March 2023 study published in Environmental Science and Pollution Research International finds that “education, training, and marketing strategies improve respirator use, while training and education motivate workers to use dust control measures.”
Silicosis symptoms and treatment
Symptoms of silicosis include cough, fatigue, shortness of breath and chest pain. There’s no specific test for silicosis. The first signs may show in an abnormal chest X-ray and a slowly developing cough, according to the American Lung Association.
Silicosis symptoms don’t appear right away in most cases, usually taking several years to develop working with silica dust. However, studies indicate that symptoms of silicosis due to exposure to artificial stone appear quicker than exposure to natural silica sources, potentially due to the higher concentration of silica in artificial stone.
There are three types of silicosis: acute (most commonly caused by working with artificial stone), accelerated and chronic, depending on the level of exposure to silica dust, according to the Centers for Disease Control and Prevention, which explains the severity of each type on its website.
Complications from silicosis can include tuberculosis, lung cancer, chronic bronchitis, kidney disease and autoimmune disorders. In some cases, silicosis can cause severe scarring of the lung tissue, leading to a condition called progressive massive fibrosis, or PMF. Some patients may require a lung transplant.
Lung damage from silicosis is irreversible, so treatment of silicosis is aimed at slowing down the disease and relieving its symptoms.
In 1995, the World Health Organization called for the elimination of silicosis by 2030, but research studies and news stories show it remains a threat to many workers.
Below, we have gathered several studies on the topic to help journalists bolster their reporting with academic research.
Research roundup
Artificial Stone Associated Silicosis: A Systematic Review
Veruscka Leso, et al. International Journal of Environmental Research and Public Health, February 2019.This systematic review aims to verify the association between exposure to silica dust in artificial stone and the development of silicosis.
Researchers narrowed down their selection from 75 papers to seven studies that met their inclusion criteria. The seven studies were from Australia, Israel and Spain. Most of the studies are observational and impede a definite association between exposure to silica while working with artificial stone and developing silicosis, the authors note.
However, “the unusually high incidence of the disease that was reported over short periods of investigations, and the comparable occupational histories of affected workers, all being involved in the manufacture and manipulation of engineered stones, may indicate a cause-effect relationship of this type.”
The review of studies reveals a lack of basic preventive measures such as lack of access to disposable masks; lack of information and training on the dangers of silica dust; and lack of periodic medical examinations, including a chest X-ray, among workers. There was limited environmental monitoring of dust levels at the workplace. Also, there was no dust suppression system, such as the use of water when polishing the stones, or effective ventilation. Machinery and tools weren’t properly set up and didn’t undergo routine checks, the authors write.
The authors recommend environmental monitoring for assessing silica levels in the workplace and verifying the effectiveness of personal protections. They also recommend the health surveillance of workers exposed to silica dust.
“Stakeholders, manufacturers, occupational risk prevention services, insurance companies for occupational accidents and diseases, business owners, occupational health physicians, general practitioners, and also employees should be engaged, not only in designing/planning processes and operational working environments, but also in assessing the global applicability of proactive preventive and protective measures to identify and control crystalline silica exposure, especially in new and unexpected exposure scenarios, the full extent of which cannot yet be accurately predicted,” they write.
Silica-Related Diseases in the Modern World
Ryan F. Hoy and Daniel C. Chambers. Allergy, November 2020.The study is a review of the mineralogy of silica, epidemiology, clinical and radiological features of the various forms of silicosis and other diseases associated with exposure to silica.
The primary factor associated with the development of silicosis is the intensity and duration of cumulative exposure to silica dust. Most countries regulate silica dust occupational exposure limits, generally in the range of 0.05 mg/m3 to 0.1 mg/m3, although the risk of dust exposure to workers still remains high at those levels.
The study provides a list of activities that could expose workers to silica dust. They include abrasive blasting of sand and sandstone; cement and brick manufacturing; mixing, glazing or sculpting of china, ceramic and pottery; construction involving bricklaying, concrete cutting, paving and demolition; sandblasting denim jeans; working with and polishing dental materials; mining and related milling; handling raw material during paint manufacturing; road and highway construction and repair; soap and cosmetic production; blasting and drilling tunnels; and waste incineration.
“Despite the large number of workers in the construction sector, there have been few studies of [silica dust] exposure in this industry,” the authors note.
Other than silicosis, conditions associated with silica exposure include sarcoidosis, an inflammatory disease that commonly affects the lungs and lymph nodes, autoimmune disease, lung cancer and pulmonary infections.
“Recent outbreaks of silica-associated disease highlight the need for constant vigilance to identify and control new and well-established sources of silica exposure. While there are currently no effective treatments for silicosis, it is a completely preventable lung disease,” the authors write.
A Systematic Review of the Effectiveness of Dust Control Measures Adopted to Reduce Workplace Exposure
Frederick Anlimah, Vinod Gopaldasani, Catherine MacPhail and Brian Davies. Environmental Science and Pollution Research International, March 2023.This study provides an overview of various interventions and their effectiveness in preventing exposure to silica dust based on a review of 133 studies from 16 countries, including the U.S., Canada, China, India, Taiwan and Australia, and published between 2010 and 2020.
These dust control measures range from simple work practices such as the use of respirators to more sophisticated technologies, such as water and air curtains and foam technology, the authors note.
The review finds increasing research interest in dust reduction, mainly in China. But overall, regulatory influence remains inadequate in preventing miners’ exposure to silica dust.
“Results from the review suggest that adopted interventions increase knowledge, awareness, and attitudes about respirator usage and generate positive perceptions about respirator usage while reducing misconceptions,” the authors write. “Interventions can increase the use, proper use, and frequency of use of respirators and the adoption readiness for dust controls but may not provide sustained motivation in workers for the continual use of dust controls or [personal protective equipment.]”
Notes from the Field: Surveillance of Silicosis Using Electronic Case Reporting — California, December 2022–July 2023
Jennifer Flattery, et al. Morbidity and Mortality Weekly Report, November 2023.This study examines the use of electronic case reporting to identify silicosis cases in California. Electronic case reporting, or eCR, is the automated, real-time exchange of case report information between electronic health records at health facilities at state and local public health agencies in the U.S. It is a joint effort between the Association of Public Health Laboratories, the Council of State and Territorial Epidemiologists, and the CDC. Currently, 208 health conditions can be reported using eCR. All 50 states and other U.S.-affiliated jurisdictions are connected to eCR. Once a public health agency receives a case report, it reaches out to the patient for contact tracing or other actions.
From October 2022 to July 2023, the California Department of Public Health received initial silicosis case reports for 41 individuals. A review of medical records confirmed 19 cases and 16 probable cases. Six of the 41 cases were considered unlikely to be silicosis after a review of medical records.
Notably, engineered stone countertop fabrication was a significant source of exposure, especially among Hispanic and Latino workers.
At least seven of the 19 confirmed cases were associated with the fabrication of engineered stone — quartz — countertops. The 19 patients’ ages ranged from 33 to 51 and all were Hispanic or Latino. One patient died and two had both lungs replaced. One was evaluated for a lung transplant.
The median age of the 35 patients with probable or confirmed silicosis was 65, ranging from 33 to 89 years, and 91% were men.
“It is important that health care providers routinely ask patients about their work as an important determinant of health,” the authors write. “Being aware of the risks associated with work exposures, as well as the regulations, medical monitoring, and prevention strategies that address those risks can help guide patient care.”
Additional research
Understanding the Pathogenesis of Engineered Stone-Associated Silicosis: The Effect of Particle Chemistry on the Lung Cell Response
Chandnee Ramkissoon, et al. Respirology, December 2023.Silicosis, Tuberculosis and Silica Exposure Among Artisanal and Small-Scale Miners: A Systematic Review and Modelling Paper
Patrick Howlett, et al. PLOS Global Public Health, September 2023.Silicosis Among Immigrant Engineered Stone (Quartz) Countertop Fabrication Workers in California
Jane C. Fazio, et al. JAMA Internal Medicine, July 2023.Silicosis and Tuberculosis: A Systematic Review and Meta-Analysis
P. Jamshidi, et al. Pulmonology, June 2023.From Basic Research to Clinical Practice: Considerations for Treatment Drugs for Silicosis
Rou Li, Huimin Kang and Shi Chen. International Journal of Molecular Science, May 2023.Silicosis After Short-Term Exposure
J. Nowak-Pasternak, A. Lipińska-Ojrzanowska and B. Świątkowska. Occupational Medicine, January 2023.Occupational Silica Exposure and Dose-Response for Related Disorders—Silicosis, Pulmonary TB, AIDs and Renal Diseases: Results of a 15-Year Israeli Surveillance
Rachel Raanan, et al. International Journal of Environmental Research and Public Health, November 2022.Demographic, Exposure and Clinical Characteristics in a Multinational Registry of Engineered Stone Workers with Silicosis
Jeremy Tang Hua, et al. Occupational & Environmental Medicine, August 2022.Current Global Perspectives on Silicosis — Convergence of Old and Newly Emergent Hazards
Ryan F. Hoy, et al. Respirology, March 2022.The Association Between Silica Exposure, Silicosis and Tuberculosis: A systematic Review and Metal-Analysis
Rodney Ehrlich, Paula Akugizibwe, Nandi Siegfried and David Rees. BMC Public Health, May 2021.Silicosis, Progressive Massive Fibrosis and Silico-Tuberculosis Among Workers with Occupational Exposure to Silica Dusts in Sandstone Mines of Rajasthan State
Subroto Nandi, Sarang Dhatrak, Kamalesh Sarkar. Journal of Family Medicine and Primary Care, February 2021.Artificial Stone Silicosis: Rapid Progression Following Exposure Cessation
Antonio León-Jiménez, et al. Chest, September 2020.Silica-Associated Lung Disease: An Old-World Exposure in Modern Industries
Hayley Barnes, Nicole S.L. Goh, Tracy L. Leong and Ryan Hoy. Respirology, September 2019.Australia Reports on Audit of Silicosis for Stonecutters
Tony Kirby. The Lancet, March 2019.Artificial Stone-Associated Silicosis: A Rapidly Emerging Occupational Lung Disease
Ryan F. Hoy, et al. Occupational & Environmental Medicine, December 2017.This article first appeared on The Journalist’s Resource and is republished here under a Creative Commons license.
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Debunking the vitamin D fad
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Throughout the pandemic, many unproven miracle COVID-19 “cures” emerged, and vitamin D claims have been one of the most persistent. This is not new for the vitamin. It’s been touted in recent decades as a way to “boost” the immune system, improve overall health, prevent a host of diseases, and allegedly even substitute for vaccines.
But as with many internet-popular health “remedies,” the reality is far less flashy and far more nuanced.
What is vitamin D, and why is it important?
Vitamin D is a nutrient that helps the body absorb calcium, which is essential for bone health. In the sunlight, your skin naturally produces vitamin D that is then stored in fat cells until it is used.
The skin pigment melanin absorbs the UV rays necessary for vitamin D production, meaning that more highly pigmented or darker skin produces less vitamin D than lighter skin with the same amount of sun exposure. Thus, people with darker skin are at higher risk of vitamin D deficiency.
Most of our vitamin D comes from the sun. An additional 10 percent to 20 percent of our vitamin D comes from foods like fatty fish (such as salmon), eggs, and mushrooms. Vitamin D supplements are another source of the nutrient for people who are unable to get enough from sun exposure and diet.
Vitamin D deficiency is real, but there’s no epidemic
Some people who promote vitamin D supplements claim that vitamin D deficiency is an epidemic causing widespread health issues. There is little evidence to support this claim. A 2022 analysis of 2001-2018 data found that 2.6 percent of people in the U.S. had severe vitamin D deficiency.
Severe vitamin D deficiency can cause serious health issues, such as muscle weakness, bone loss in adults, and rickets (weak bones) in children. Some people are at higher risk for the deficiency, including individuals with certain disorders that prevent the body from absorbing or processing vitamin D or those with a family history of vitamin D deficiency.
Black Americans have the highest rates of severe vitamin D deficiency at nearly 12 percent. Severe vitamin D deficiency is also slightly higher in the U.S. during the winter when people get less sun exposure. Rates of moderate vitamin D deficiency are higher at 22 percent overall and are highest among Black Americans (49 percent) and Mexican Americans (35 percent).
Although severe vitamin D deficiency exists in the U.S., it is far from common. Most tellingly, conditions that are directly linked to vitamin D deficiency are not widespread. There is no epidemic of rickets, for example, or bone loss in adults.
There’s little evidence that vitamin D supplements improve overall health
Vitamin D supplements have clear, proven positive effects for people with vitamin D deficiency. Other health benefits of vitamin D supplements are less certain.
There is some evidence that the supplement may reduce the risk of fracture in adults with osteoporosis, a condition that causes weak, fragile bones. However, the benefit appears to be limited to people who have low vitamin D levels. In adults with normal vitamin D levels, supplements have no effect on fracture risk.
The largest randomized controlled trial of vitamin D, called VITAL, investigated the effects of vitamin D supplementation in people without an existing deficiency. The study found that vitamin D supplements had no effects on the risk of cancer, diabetes, or cardiovascular disease, including heart attack and stroke. The study concluded that more research is necessary to determine who may benefit from vitamin D supplements.
Independent analyses found that vitamin D supplementation may be associated with a long-term decrease in cancer mortality, but results are mixed and also require more investigation.
A 2021 analysis of past vitamin D trials found no overall health benefits from vitamin D supplements in people with normal vitamin D levels. Most large-scale studies have found no link between vitamin D supplements and lower all-cause mortality (deaths from any cause), except in older adults and those with vitamin D deficiency.
Vitamin D provides modest protection against respiratory infections
Vitamin D is important for immune function, but this is often misconstrued as vitamin D “boosting” the immune system.
Some people falsely believe that taking vitamin D supplements will keep them healthy and prevent infections like the flu or COVID-19. In reality, clinical trials and large-scale studies of vitamin D have found only minimal protective effects against respiratory infections.
A 2021 analysis of 46 trials found that 61.3 percent of participants who took daily vitamin D supplements got respiratory infections during the study periods—compared to 62.3 percent of people who did not take the supplements. A 2024 meta-analysis of 43 trials found no overall protective effect against respiratory infections, but it detected a slight decrease in risk among people who took specific doses daily.
In young children, there is some evidence that vitamin D supplementation may reduce the length of respiratory infections. However, it does not affect the number or severity of infections that children have.
Despite claims that taking vitamin D can protect against COVID-19, two clinical trials found that taking daily vitamin D supplements did not reduce the risk or severity of COVID-19 infections, even at high doses.
Context is key when considering vitamin D’s benefits
None of these studies contradict the well-established evidence that people with vitamin D deficiency benefit from vitamin D supplements. But it’s important to remember that many of the most popular health claims about vitamin D’s benefits are based on research in people with vitamin D deficiency.
Research in vitamin D-deficient populations is important, but it tells us little about how vitamin D will affect people with normal or close to normal vitamin D levels. A closer look at vitamin D research in people without low levels reveals little evidence to support the idea that the general population benefits from taking vitamin D supplements.
For more information, or to learn about your vitamin D levels, talk to your health care provider.
This article first appeared on Public Good News and is republished here under a Creative Commons license.
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The Osteoporosis Breakthrough – by Dr. Doug Lucas
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“Osteoporosis” and “break” often don’t go well together, but here they do. So, what’s the breakthrough here?
There isn’t one, honestly. But if we overlook the marketing choices and focus on the book itself, the content here is genuinely good:
The book offers a comprehensive multivector approach to combatting osteoporosis, e.g:
- Diet
- Exercise
- Other lifestyle considerations
- Supplements
- Hormones
- Drugs
The author considers drugs a good and important tool for some people with osteoporosis, but not most. The majority of people, he considers, will do better without drugs—by tackling things more holistically.
The advice here is sound and covers all reasonable angles without getting hung up on the idea of there being a single magical solution for all.
Bottom line: if you’re looking for a book that’s a one-stop-shop for strategies against osteoporosis, this is a good option.
Click here to check out The Osteoporosis Breakthrough, and keep your bones strong!
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