Human migration over the past 500 years has led to an increase in vitamin D deficiency



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When? September.

By who? University of Cordoba in Spain.

What have scientists studied? 50 Covid-19 hospital patients with Covid-19 received vitamin D. Their health results were compared to 26 volunteers in a control group who did not receive the tablets.

What did they find? Only one of the 50 patients required intensive care and none died. Half of the 26 people infected with the virus who did not take vitamin D were subsequently admitted to intensive care and two died.

What were the limitations of the study? Small pool of volunteers. Patients’ vitamin D levels were not checked prior to admission. Co-morbidities were not taken into account.

When? September.

By who? University of Chicago.

What have scientists studied? The vitamin D levels of 500 Americans have been tested. The researchers then compared the volunteers’ levels with the number of captured coronaviruses.

What did they find? 60 percent higher rates of Covid-19 in people with low levels of the “sunshine vitamin”.

What were the limitations of the study?

The researchers did not check for other compositional factors. It is not known whether the volunteers were deficient in vitamin D at the time of their coronavirus tests. People’s age, work and place of residence – factors that greatly increase the risk of contracting the virus – were not taken into account.

When? September.

By who? University of Tehran, Iran, and Boston University.

What have scientists studied? Analysis of data from 235 hospitalized patients with Covid-19.

What did they find? Patients who had enough vitamin D – at least 30 ng / mL – were 51.5 percent less likely to die from the disease. They also had a significantly lower risk of becoming seriously ill or needing ventilation. Patients who had a lot of nutrients also had less inflammation – often a deadly side effect of Covid-19.

What were the limitations of the study? Confounding factors, such as smoking, and socioeconomic status were not recorded for all patients and could have an impact on the severity of the disease.

When? July.

By who? Tel Aviv University, Israel.

What have scientists studied? 782 people who tested positive for the coronavirus had their pre-infection vitamin D levels evaluated retrospectively and compared to healthy people.

What did they find? People with vitamin D levels below 30 ng / ml – optimal – were 45% more likely to test positive and 95% more likely to be hospitalized.

What were the limitations of the study? Did not examine underlying health issues or check vitamin D levels at the time of infection.

When? June.

By who? Free University of Brussels.

What have scientists studied? Comparison of vitamin D levels in nearly 200 patients at Covid-19 hospital with a control group of more than 2,000 healthy people.

What did they find? Men hospitalized for the infection were significantly more likely to suffer from vitamin D deficiency than healthy men of the same age. Deficiency rates were 67% in the COVID-19 patient group and 49% in the control group. The same was not found for women.

What were the limitations of the study? Independent scientists claim that blood levels of vitamin D drop when people develop serious illness, which the study did not take into account. This suggests that it is the disease that causes the blood levels of vitamin D to drop in this study, and not the other way around.

When? June.

By who? Inha University in Incheon, South Korea.

What have scientists studied? 50 hospitalized patients with Covid-19 were checked for levels of all vital vitamins and compared to a control group.

What did they find? 76% of them had vitamin D deficiency, and severe vitamin D deficiency (<10 ng / dl) was observed in 24% of patients with Covid-19 and only 7% in the control group.

What were the limitations of the study?

The small sample size and researchers have never explained the drop in vitamin levels when they get sick.

When? June.

By who?. Independent scientists in Indonesia.

What have scientists studied? Monitoring of vitamin D levels in 780 patients at Covid-19 hospital.

What did they find? Almost 99% of patients who died had vitamin D deficiency. Among patients with vitamin D levels above 30 ng / ml – considered optimal – only a percentage died.

What were the limitations of the study? It has not been evaluated by scientific colleagues, a process that often reveals flaws in studies.

When? May.

By who? University of Glasgow.

What have scientists studied? Vitamin D levels in 449 people from the UK Biobank who had confirmed Covid-19 infection.

What did they find? Vitamin D deficiency was associated with an increased risk of infection – but not after adjusting for founders such as ethnicity. This led the team to conclude that their “results do not support a potential link between vitamin D levels and the risk of Covid-19 infection”.

What were the limitations of the study? Vitamin D levels were taken 10 to 14 years in advance.

When? May.

By who? University of East Anglia.

What have scientists studied? Average vitamin D levels in populations in 20 European countries were compared to Covid-19 infection and death rates at the time.

What did they find? The average level of vitamin D in each country was “strongly associated” with higher levels of Covid-19 cases and deaths. The authors said at the time: ‘The population group most vulnerable to Covid-19 is also the one with the most vitamin D deficiency.’

What were the limitations of the study? The number of cases in each country has been affected by the number of tests performed, as well as the different measures each country takes to prevent the spread of infection. And he was only looking at correlation, not causation.

When? May.

By who? Northwestern University.

What have scientists studied? Cross-referenced data from dozens of studies around the world that included vitamin D levels in Covid-19 patients.

What did they find? Patients with severe deficiency are twice as likely to experience major complications and die.

What were the limitations of the study? Cases and deaths in each country were affected by the number of tests performed.

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