News / Health

Vitamin D May Help Avert Alzheimer’s Disease, Dementia

This undated image provided by Merck & Co. shows a cross section of a normal brain (right) and one of a brain damaged by advanced Alzheimer's disease.
This undated image provided by Merck & Co. shows a cross section of a normal brain (right) and one of a brain damaged by advanced Alzheimer's disease.
Jessica Berman

Simply taking a daily vitamin D supplement may be enough to ward off Alzheimer’s disease and other forms of dementia, according to medical experts.

Researchers caution, however, that the results of a large, recently published study do not demonstrate that low levels of vitamin D necessarily cause dementia. Still, they are encouraged by the link between the affliction and vitamin D deficiency.

An estimated 50 percent of older individuals have low levels of the nutrient, according to the study, published in the journal Neurology.
 
If there is, in fact, a connection between depleted vitamin D levels and dementia, including Alzheimer’s, it may be possible to prevent or even treat the brain disorders with a simple supplement.

“It’s an open question whether you could reverse the impact on peoples’ memory and other aspects of their ability to think clearly. What we’re hoping is, obviously, that we can at least slow down the accumulation of disease in the brain. Or if we could stabilize things, that would be great,” said David Llewellyn, a clinical epidemiologist with Britain’s University of Exeter Medical School.

He is co-author of a study involving just over 1,600 elderly American adults over the age of 65.  

Participants in the six-year study were dementia-free when researchers measured their vitamin D levels. After a half dozen years, 171 of the adults developed dementia and 102 had clinical signs of Alzheimer’s disease.  

Investigators found that low levels of vitamin D increased the risk of dementia by 53 percent. Those with severe deficiency had a 125 percent increased risk of dementia compared to those with normal vitamin D levels.

In addition, people who were deficient in vitamin D were 70 percent more likely to develop Alzheimer’s disease. Those who had severe deficiency were 120 percent more likely to develop Alzheimer's, compared with people whose vitamin D levels were adequate.

“We were surprised by this because the association was about twice as strong as we predicted from our previous research.  So the risk of dementia was more than doubled in those who had the lowest levels of vitamin D,” Llewellyn said.

Other studies have linked vitamin D deficiency to stroke, autoimmune disease and the health of nerve cells.

The best sources of vitamin D are exposure to sunlight and a diet rich in oily fish, like salmon. Llewellyn says people in northern climates tend to be at higher risk of deficiency. But there’s a fair amount of vitamin D deficiency in countries where people cover up to avoid over-exposure to the sun and skin cancer.

There may be a vicious cycle among people who develop dementia. Their vitamin D levels can become even more depleted as they tend to eat poorly and become less physically active, according to Llewellyn.

You May Like

Missouri Town Braces for Possible Racial Unrest

Situation in Ferguson hinges on whether white police officer will be indicted for August shooting death of unarmed black teen; decision could come Monday More

Video Ukraine Marks Anniversary of 1930s Deadly Famine

President Poroshenko compares Soviet-era ‘genocide’ to current tactics of pro-Russia rebels in Ukraine's east More

S. Philippines Convictions Elusive 5 Years After Election-related Killings

Officials vowed to deliver justice as the nation marked the anniversary of the country's worst political massacre that left 58 dead, more than half media More

This forum has been closed.
Comment Sorting
Comments
     
by: Wesley Dodds
August 07, 2014 1:56 PM
More breathless, irresponsible medical reporting on the terminal Alzheimer's Disease from the latest medical research snake oil salespersons looking for funding. They will tell you anything and everything to find a Sugar Daddy to get research funding. Anything and everything will cure Alzheimer's Disease: Vitamin D, fish oil, fish, coffee, no coffee, sugary hot chocolate, no sugar, Lavado cocoa extract, coconut oil, Omega-3 Fatty Acids, antioxidant is coenzyme Q10, coral calcium, ginkgo biloba, diabetes drugs, exercise, losing weight, not losing weight, baking soda, pumpkin seeds, sesame oil, vinegar, wheat germ, carrots, blueberries, bottled water, spinach, orange juice, soy milk, almond extract, curry, ginger, lemon oil, salt, no salt, sage, tumeric, nasal inhalers, etc., etc., etc. I put this VERY INCOMPLETE list together to give a sense of some of the endless breathless reporting on this, each one "WITH A CURE." And of course, not one of them does.

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
New Skateboard Defies Gravityi
X
November 21, 2014 5:07 AM
A futuristic dream only a couple of decades ago, the hoverboard – a skateboard that floats above the ground - has finally been made possible. While still not ready for mass production, it promises to become a cool mode of transport... at least over some surfaces. VOA’s George Putic reports.
Video

Video New Skateboard Defies Gravity

A futuristic dream only a couple of decades ago, the hoverboard – a skateboard that floats above the ground - has finally been made possible. While still not ready for mass production, it promises to become a cool mode of transport... at least over some surfaces. VOA’s George Putic reports.
Video

Video Falling Gas Prices Impact US Oil Extraction

With the price of oil now less than $80 a barrel, motorists throughout the United States are benefiting from gas prices below $3 a gallon. But as VOA’s Kane Farabaugh reports, the decreasing price of petroleum has a downside for the hydraulic fracturing industry in the United States.
Video

Video Tensions Build on Korean Peninsula Amid Military Drills

It has been another tense week on the Korean peninsula as Pyongyang threatened to again test nuclear weapons while the U.S. and South Korean forces held joint military exercises in a show of force. VOA’s Brian Padden reports from the Kunsan Air Base in South Korea.
Video

Video Mama Sarah Obama Honored at UN Women’s Entrepreneurship Day

President Barack Obama's step-grandmother is in the United States to raise money to build a $12 million school and hospital center in Kogelo, Kenya, the birthplace of the president's father, Barack Obama, Sr. She was honored for her decades of work to aid poor Kenyans at a Women's Entrepreneurship Day at the United Nations.
Video

Video Gay Evangelicals Argue That Bible Does Not Condemn Homosexuality

More than 30 U.S. states now recognize same-sex marriages, and an increasing number of mainline American churches are blessing them. But evangelical church members- which account for around 30 percent of the U.S. adult population - believe the Bible unequivocally condemns homosexuality. VOA's Jerome Socolovsky reports that gay, lesbian, bisexual and transgender evangelicals are coming out. Backed by a prominent evangelical scholar, they argue that the traditional reading of the bible is wrong.
Video

Video Ebola Economic Toll Stirs W. Africa Food Security Concerns

The World Bank said Wednesday that it expects the economic impact of the Ebola outbreak on the sub-Saharan economy to cost somewhere betweenf $3 billion to $4 billion - well below a previously-outlined worst-case scenario of $32 billion. Some economists, however, paint a gloomier picture - warning that the disruption to regional markets and trading is considerable. Henry Ridgwell reports from London.
Video

Video Mexico Protests Escalate Over Disappearances

Protests in Mexico over 43 students missing since September continue to escalate, reflecting growing anger among Mexicans about a political system they view as corrupt, and increasingly tainted by the drug trade. Mounting outrage over the disappearances is now focused on the government of President Enrique Pena Nieto, accused of not doing enough to end insecurity in the country. More from VOA's Victoria Macchi.
Video

Video US Senate Votes Down Controversial Oil Pipeline - For Now

The U.S. Senate has rejected construction of a controversial pipeline to transport Canadian oil to American refineries. The $5 billion project still could be approved next year, but it faces a possible veto by President Barack Obama. As VOA’s Michael Bowman reports, the pipeline has exposed deep divisions in Congress about America’s energy future.
Video

Video Can Minsk Cease-fire Agreement Hold?

Growing tensions between government troops and separatists in eastern Ukraine further threaten a cease-fire agreement reached two months ago in the Belarusian capital of Minsk. Critics of U.S. policy in Ukraine say it is time the Obama administration gives up on that much-violated cease-fire and moves toward a new deal with Russia. VOA's Scott Stearns has more.
Video

Video Chaos, Abuse Defy Solution in Libya

The political and security crisis in Libya is deepening, with competing governments and, according to Amnesty International, widespread human rights violations committed with impunity. VOA’s Al Pessin reports from London.
Video

Video US Hosts Record 866,000 Foreign Students

Close to 900,000 international students are studying at American universities and colleges, more than ever before. About half of them come from Asia, mostly China. The United States hosts more foreign students than any other country in the world, and its foreign student population is steadily growing. Zlatica Hoke reports.
Video

Video Ferguson Church Grapples with Race Relations

Many white residents of Ferguson, Missouri, say they chose to live there because of the American Midwest community's diversity. So, they were shocked when a white police officer killed an unarmed black teenager in August – and shaken by the resulting protests and violence. Some local churches are leading conversations on how to go forward. VOA’s Ayesha Tanzeem reports.

All About America

AppleAndroid