It's been a long time since we looked at the number of confirmed cases.Today, more than 5.38 million cases have been confirmed worldwide, with 340,000 deaths.Brazil has even gone to the second place, South America is the "new epicenter" of the epidemic!What surprises me most is that Peru, such a small country, has more people infected than China!

The covid-19 pandemic has turned into such a situation in the world. I never expected that the situation would change so quickly and many people's understanding would be overturned.

The mechanism behind the difference in symptoms caused by the virus is still unclear.

Why do some people who are infected have no symptoms, while others who are young and healthy quickly progress to severe illness and die?

In Japan, for example, 26 people have died suddenly of covid-19 since mid-march. Eleven people died at home, and nine died after being rushed from their homes to hospital. Several of them underwent novel coronavirusPCR tests and died at home while recuperating or waiting for test results. Six people were confirmed dead in hospital after their health deteriorated on the street or at work. Go out in the morning, the wife still talks with the husband normally, come home in the evening the husband dies tragically in the home.In the ICU of a New York hospital, there are many young people between the ages of 20 and 60 who have no underlying disease.In the Boston area, 147 homeless people were diagnosed, but strangely, none had symptoms.

What determines the outcome of an infected person?

A new discovery by scientists may be slowly unraveling the mystery.

 Scientists found that severe vitamin D deficiency doubled the risk of death after coronavirus infection

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Covid-19 patients with severe vitamin D deficiency are twice as likely to have major complications and die as those with adequate levels of vitamin D. There is growing evidence that people with adequate levels of vitamin D are more likely to survive the deadly disease after being infected with the new coronavirus.

Research team led by northwestern university from China, France, Germany, Italy, Iran, South Korea, Spain, Switzerland, the United Kingdom and the United States of hospitals and clinics to statistical analysis of data, found that with the outbreak of the new champions league lighter compared to countries and regions, from Italy, Spain and Britain and other COVID - 19 patients with high mortality rates countries with significantly lower vitamin D levels.

Previously, it was widely believed that differences in covid-19 fatality rates were mainly due to the quality of care in different countries, population age distribution, virus testing rates, and differences in novel coronavirus strains.But scientific analysis by some institutions has found that these factors are not the main reason for the difference in fatality rates.In northern Italy, for example, where the quality of medical care is among the highest in the world, mortality rates are high and there are significant differences among people of the same age.

The researchers found that vitamin D reduced the severity of the disease by inhibiting cytokine storms in covid-19 patients.

Some patients with covid-19 had mild disease in the early stage, which was suddenly aggravated in the late stage, and finally died from multiple organ failure, and the aggravation was caused by "cytokine storm".

In normal mode, when the virus attacks, the immune counterattack; When the virus is defeated, immunity is withdrawn.But sometimes the immune cell army gets out of control and the immune system becomes overactive, leading to a "cytokine storm."And that's where vitamin D comes in.

Vitamin D not only strengthens our innate immune system, it also prevents it from becoming overactive.

This means that, to some extent, having healthy levels of vitamin D can help protect patients from serious complications caused by novel coronavirus and even death.

During the outbreak, more and more studies found a connection between vitamin D and novel coronavirus!In fact, this is not the first study on the relationship between vitamin D and novel coronavirus.

During the epidemic, more and more researchers found a relationship between the two!Last month, researchers from the queen Elizabeth hospital foundation trust and the university of east Anglia in England found a link between low vitamin D levels and novel coronavirus mortality.In the us state of Louisiana, where African americans account for 70 per cent of covid-20 deaths, blacks are more likely than others to be deficient in the vitamin because darker skin absorbs less sunlight.In shelters in the Boston area, 147 people were infected, all of whom were asymptomatic.

While the health and nutritional status of homeless people is relatively poor, they are exposed to the sun for a relatively long time, and the body gets 80-90% of its vitamin D from exposure to the sun.A study by the free university of Amsterdam in the Netherlands found that countries with low levels of vitamin D also had the highest rates of death and covid-19 infection.A recent study from trinity college Dublin confirmed a 50 per cent drop in chest infections among adults who took vitamin D supplements.So, while it's only theoretical that vitamin D might help with covid-19, American caregivers are trying to get patients out in the sun.

90% of Chinese lack vitamin D!

When it comes to vitamin D, scientists have been calling for it for more than a decade.

In 2006, a study published in the world's top medical journal Nature believed that vitamin D could control infection. In the same year, a study published in Science described that vitamin D can improve the body's resistance and control infection.In 2008, TIME magazine listed "the contribution of vitamin D to health" as one of the top 10 medical findings of the year.A Japanese study showed that adequate levels of vitamin D in children can halve the incidence of influenza.But in China, nearly 80 percent of the population has a vitamin D deficiency or deficiency.If you're indoors, out of the sun, and don't eat much meat...

Then you might be one of them.Vitamin D has long been considered only as a nutrient associated with bone health.Once ingested inadequately, bones can become thin, brittle, and even deformed.

In addition, a growing body of medical evidence has shown that vitamin D deficiency also increases the risk of cardiovascular disease, high blood pressure, diabetes, chronic kidney disease, common tumors and autoimmune diseases.

Recent studies have found that vitamin D has a wide range of effects.

Vitamin D significantly reduces cancer mortality!

Babies who were given adequate vitamin D at age 1 were 88 percent less likely to develop diabetes over the next 30 years.

Vitamin D regulates blood pressure, improves heart function, and reduces the risk of heart disease and stroke.

A lot of people know to complement vitamin D to want "more bask in the sun", more than 90% of vitamin D is to rely on human skin in ultraviolet light "photosynthesis" and become.

Natural foods are usually low in vitamin D and food intake alone is not enough.

Take some vitamin D supplements.But watch out!Although vitamin D is good,  it can't be replenished too much. Too much of it can be toxic. Specific still want to follow doctor's advice carefully!

So people or do not live too delicate, do more exercise, enjoy more sun, eat more vitamin and nutrition, so as to improve our immunity!