A randomized controlled trial of vitamin D supplements led by QIMR Berghofer found that most people were not protected from the development of colds, flu, and other acute respiratory infections.
The largest trial of this type that has ever studied the relationship between vitamin D and respiratory infections, however, may help supplements slightly reduce the length of infections and reduce the severity of those diseases. I showed that I couldn’t.
The research results were published in a scientific journal this week Lancet Diabetes and Endocrinology..
Researchers analyzed self-reports Health data From 16,000 Australians aged 60 to 84 who participated in the D-Health Trial led by the QIMR Berghofer Medical Research Institute.
Participants were given 60,000 international units of vitamin D capsules or placebo each month for up to 5 years. They completed their annual health report and some completed an eight-week winter diary that recorded respiratory symptoms.
Professor Rachel Neil, Principal Investigator and Head of Cancer Cause and Prevention Group at QIMR Berghofer, said that participants who took vitamin D supplements had a cold in a slightly shorter time than those who did not. And reported that he had symptoms of influenza. They also showed severe symptoms in a shorter amount of time and required less medication to manage the symptoms.
“Our clinical trials have shown that people who take vitamin D supplements get the same proportion of colds and flu as people who take placebo, but on average, people who take supplements I reported that the number of days was slightly reduced. I experienced symptoms (on average about half a day), “said Professor Neil.
“The survey results show that vitamin D Immune system It boosts a little, but supplementing the general public with vitamin D does not prevent people from getting sick in the first place and does not significantly improve the rate of recovery.
“It is important to note that this study was conducted on Australians and most of the participants were not deficient in vitamin D from the beginning. Countries where the majority of the population is vitamin D. You may see a greater protective effect. It’s lacking. “
“This study suggests that taking supplements does not have a significant benefit in preventing colds and the flu in people who are not deficient in vitamin D.”
The amount of vitamin D needed in the blood is controversial, but data from the 2011-12 National Health Survey suggest that one in four adults in Australia may be low in vitamin D.
According to Australian data 1, most people experience respiratory tract infections such as colds and flu at least once a year. Infection rates are generally highest during the winter months. During the winter, people have the lowest vitamin D levels because of less UV light and more time spent indoors.
Professor Neil said the test results are timely as people around the world are trying to understand the best way to improve immunity in the face of a COVID-19 pandemic.
“Published studies suggest that higher vitamin D levels may reduce the risk and severity of COVID-19, but these studies had fairly serious limitations, so the results Is unreliable, “she said.
“The D-Health Trial was completed before the start of the COVID-19 pandemic, so no specific answer has been provided. However, findings on the reduction in length and severity of respiratory tract infections show the immune system. Suggests that there may be some benefit to Vitamin D Supplement, Especially for those who are in short supply. “
Professor Neil said that anyone worried about vitamin D levels should consult a doctor.
Researchers are currently using the data collected during the trial, vitamin D About other health problems such as depression, cancer and heart disease.
Hai Pham et al. Effect of Vitamin D Supplementation on Acute Respiratory Tract Infections in Older Australians: Analysis of Data from D-Health Trial, Lancet Diabetes and Endocrinology (2021). DOI: 10.1016 / S2213-8587 (20) 30380-6
Provided by QIMR Berghofer Medical Research Institute
Quote: Clinical trials have shown that vitamin D does not avoid colds and the flu (January 14, 2021). Obtained from https: //medicalxpress.com/news/2021-01-clinical-trial-vitamin-d-ward.html on January 14, 2021.
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