How Important is Vitamin D?
>> Jul 26, 2012
Vitamin
D is different from most other vitamins because our bodies can make most of the
vitamin D we need. Some foods are
fortified with vitamin D (such as milk), but vitamin D mostly comes from the
sun. The skin makes vitamin D from cholesterol when it is directly exposed to 10-20
minutes of sunlight, especially in the summer months. So if your body can make its own vitamin D,
why are so many people deficient?
Certain
population groups are more prone to vitamin D deficiency. People with darker skin do not absorb the
vitamin as well as those with lighter skin.
Also, people who live in colder climates, who have illnesses that
prevent proper absorption of nutrients, and breastfed children who do not
receive supplemental vitamin D, are all at risk for developing a deficiency.
The elderly are at high risk due to time spent indoors and the fact that the
skin no longer absorbs vitamin D as efficiently as we age.
Why
is vitamin D important?
The
major role of vitamin D is to help with the absorption of calcium and is vital to
maintain bone health. Vitamin D also plays a role in muscle movement and helps
the immune system fight bacteria and viruses. There has been research linking too low of
levels of vitamin D to certain cancers like thyroid, prostate, and breast
cancer. Research has shown that vitamin
D may play a role in the prevention of diabetes and hypertension, although the
exact mechanism has not been discovered. Vitamin D can also be related to
difficulty losing weight. People who are obese tend to have lower levels of
vitamin D, as vitamin D is fat soluble and gets trapped in the body’s fat cells.
How
do I know if I am deficient and what should I do?
Vitamin
D deficiency can be determined via a simple blood test ordered by your doctor. If
you are deficient, a doctor may prescribe up to 10,000 IU of the vitamin for a
short time to help improve your levels.
Most over-the-counter multivitamins contain about 600-800 IU of vitamin
D which is enough to maintain normal blood levels. Be careful to check the
total amount of vitamin D you are getting if you are taking a calcium
supplement (with vitamin D) in addition to your regular multivitamin. The total
for the day should not exceed 1000 IU from supplements. In most commercial vitamins,
vitamin D is found in either the D2 (ergocalciferol) form or D3
(cholecalciferol). Many experts believe
that D2 is not well absorbed or utilized because it comes from plants and not
an animal source. Vitamin D3 more closely matches the type vitamin D found in
the body; therefore it is the preferred form for supplementation. Do not worry about getting too much vitamin D
from the sun, so get out there and enjoy the sunshine!
References
1.http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-deficiency/what-is-vitamin-d-deficiency/
2.
http://www.niams.nih.gov/health_info/bone/bone_health/nutrition/
3.
http://www.medicalnewstoday.com/releases/4464.php
4.
http://www.ncbi.nlm.nih.gov/pubmed/21177785
5.
http://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/
Guest article by Julie Masci for NLN, Diet and Nutrition specialists from Brisbane, Australia.
1 komentar:
Selain di dpt dari makanan hrs di tunjang dg mengkosumsi vitamin nya jg ya mba..
Trims buat share infonya mba Lin :)
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