विटामिन डी – डॉक्टर आप को ये नहीं बतायेंगे | विटामिन डी के प्रमुख स्त्रोत | Vit d कमी के लक्षण

विटामिन डी – डॉक्टर आप को ये नहीं बतायेंगे | विटामिन डी के प्रमुख स्त्रोत | Vit d कमी के लक्षण

Hello viewers. I am doctor Narottam
Agarwala. Today I am going to tell you about vitamin D. Apart from this vitamin
rest of the vitamins are consumed as a part of our diet, but this vitamin is
actually manufactured inside our body actually vitamin D can be called as a
hormone, but since some of its properties matches vitamins so it is called a
vitamin. Commonly vitamins are of two types : fat soluble and water soluble.
Vitamins which can dissolve in water are called water soluble vitamins. vitamin D
is a fat-soluble vitamin it cannot dissolve in water, it can dissolve in
fat. Vitamin D is of two types : vitamin d2 and Vitamin d3. The vitamin which
is generated in our body with the help of sunlight is vitamin d3 and it is
essential for us. It is synthesized when UV-B rays from the Sun strike
our skin. After being manufactured this vitamin is activated in liver and kidney
and regulates more than 200 genes in our body which includes brain, heart, kidneys,
bone, intestine, skin, gonads, prostate, breast, parathyroid and immune system. You
must have commonly heard that vitamin D is essential for our bone health, this is
because vitamin D helps to maintain the level of calcium and phosphorus in the
bloodstream and you know calcium and phosphorus are essential for bones.
vitamin D is capable to both activate and suppress the immune system. Sometimes
it suppresses our immune system as we can notice in
rheumatoid arthritis, lupus and in multiple sclerosis. Many a times vitamin
D activates our immune system to fight with certain diseases like cancer,
tuberculosis, pneumonia, flu. vitamin D reduces the risk of heart attack, not
only this it also reduces the risk of stroke. I have seen it many times in my
practice that it helps a lot in diabetes. In diabetes it improves the release and
response of insulin. Now you might be wondering that when the sunlight can
produce this vitamin D in the body then how does this vitamin go low in our body.
In order to understand this we must first know how much vitamin d do our
body need every day roughly we need 10 thousand international units of vitamin
D per day. Now in order to manufacture ten thousand international units of
vitamin D our body needs UV index three rays or greater than index three rays.
The duration of sun exposure needed to manufacture this amount of vitamin D
depends on the skin type and the geographic location of the place, but we
do not have lot of control over these parameters, so what can we do : we can
alternatively take vitamin D from a different source
like fish oil and cod liver oil. Let us now understand an easy calculation. Due
to clothes only 50 to 75 percent of our skin can be exposed to sunlight and
sunlight contains UV index 3 or higher rays between morning 10:30 a.m. to
2:00 p.m. afternoon. earlier in the morning before 10:30 a.m. and evening we find
more UV-A rays in the sunlight UVA has no role in manufacturing vitamin D in
our body. Actually UVA harm our skin. Now let’s know the reasons for
vitamin D deficiency in human body. The first reason is UV exposure – if we are
exposed to less amount of UVB rays then our body will not be able to manufacture
sufficient quantity of vitamin D sunscreen with SPF 15
do not allow UV rays to penetrate our skin so our body is not able to
manufacture sufficient vitamin D. Now if our body is manufacturing less amount of
vitamin D and we are not consuming vitamin D supplements, then we may have
vitamin D deficiency. There are certain liver and kidney diseases where in
although we have sufficient quantity of vitamin D in our body still this vitamin
D is not able to get activated, and we get symptoms of vitamin D deficiency.
Another reason is obesity – obesity also reduces the level of vitamin D in our
body since vitamin D is fat soluble and obese
people have lot of fat in their body this fat
keeps holding the vitamin D. Another reason is old age in old age our body is
able to manufacture less amount of vitamin D but this does not mean that
those people who are older they need to expose more to the Sun. Vitamin D is
associated with many diseases like muscular pain called myalgia, cancer,
diabetes, high blood pressure, congestive heart failure, diseases related to bones
like rickets, osteomalacia, osteoporosis, autoimmune diseases like rheumatoid
arthritis, multiple sclerosis, lupus and depression. After listening to so big
diseases everyone will feel that we should consume vitamin D, but excess
amount of vitamin D is toxic for our body but the good thing is that even
excessive exposure to sun rays do not produce toxicity but it has its own risk :
like skin cancer, Sun tanning etc so you might be wondering if we can take this
light from artificial sources, but this is not free from side
effects, since some of the artificial lights have UVA UVB and UVC all the
three rays UVA tans our skin very quickly
UVC which is actually stopped by the ozone layer in our atmosphere, it is very
harmful. So we need only UVB for vitamin D synthesis most of the UV bulbs have
excessive amount of UV-A rays which causes skin tanning and the risk of skin cancer
increases. Vitamin D helps in absorption of calcium. When the level of vitamin D
in our body reduces then the parath- -hormone stimulates the breakdown of
bones so that we have sufficient amount of calcium in our blood stream but it is
very harmful for our bones whatever supplement we might take but
the best is sunlight so we should try to expose ourselves to sunlight between
10:30 a.m. and 2 p.m. for a sufficient duration 2 to 3 times a week.
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  • Kunal Guha says:

    Thanks for your indepth analysis Dr. Narottam Agarwala. I never knew that Vitamin D was a hormone. I am a diabetic patient myself and maybe low Vitamin D is a possible cause. I hope patients benefit from this wonderful video.

  • Manpreet Singh says:


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