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Vitamin D, also known as the “sunshine” vitamin, which is produced by the body as a response to sun exposure.
Having enough vitamin D is important for a number of reasons, including maintaining healthy bones and teeth; it may also protect against a range of conditions such as cancer, type 1 diabetes, and multiple sclerosis.
Vitamin D has multiple roles in the body, helping to:
- Maintain the health of bones and teeth.
- Support the health of the immune system, brain, and nervous system.
- Regulate insulin levels and aid diabetes management.
- Support lung function and cardiovascular health.
Health benefits of vitamin D
1) Vitamin D for healthy bones
Vitamin D plays a substantial role in the regulation of calcium and maintenance of phosphorus levels in the blood, two factors that are extremely important for maintaining healthy bones.
We need vitamin D to absorb calcium in the intestines and to reclaim calcium that would otherwise be excreted through the kidneys.
Vitamin D deficiency in children can cause rickets, a disease characterized by a severely bow-legged appearance due to softening of the bones.
In adults, vitamin D deficiency manifests as osteomalacia (softening of the bones) or osteoporosis. Osteomalacia results in poor bone density and muscular weakness. Osteoporosis is the most common bone disease among post-menopausal women and older men.
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2) Reduced risk of flu
Children given 1,200 International Units of vitamin D per day for 4 months during the winter reduced their risk of influenza A infection by over 40 percent.
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3) Reduced risk of diabetes
Several observational studies have shown an inverse relationship between blood concentrations of vitamin D in the body and risk of type 2 diabetes. In people with type 2 diabetes, insufficient vitamin D levels may negatively effect insulin secretion and glucose tolerance. In one particular study, infants who received 2,000 International Units per day of vitamin D had an 88 percent lower risk of developing type 1 diabetes by the age of 32.
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4) Healthy infants
Children with normal blood pressure who were given 2,000 International Units (IU) per day had significantly lower arterial wall stiffness after 16 weeks compared with children who were given only 400 IU per day.
Low vitamin D status has also been associated with a higher risk and severity of atopic childhood diseases and allergic diseases, including asthma, atopic dermatitis, and eczema. Vitamin D may enhance the anti-inflammatory effects of glucocorticoids, making it potentially useful as a supportive therapy for people with steroid-resistant asthma.
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5) Healthy pregnancy
Pregnant women who are deficient in vitamin D seem to be at greater risk of developing preeclampsia and needing a cesarean section. Poor vitamin D status is associated with gestational diabetes mellitus and bacterial vaginosis in pregnant women. It is also important to note that high vitamin D levels during pregnancy were associated with an increased risk of food allergy in the child during the first 2 years of life.
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6) Cancer prevention
Vitamin D is extremely important for regulating cell growth and for cell-to-cell communication. Some studies have suggested that calcitriol (the hormonally active form of vitamin D) can reduce cancer progression by slowing the growth and development of new blood vessels in cancerous tissue, increasing cancer cell death, and reducing cell proliferation and metastases. Vitamin D influences more than 200 human genes, which could be impaired when we do not have enough vitamin D.
Vitamin D deficiency has also been associated with an increased risk of cardiovascular disease, hypertension, multiple sclerosis, autism, Alzheimer’s disease, rheumatoid arthritis, asthma severity, and swine flu, however more reliable studies are needed before these associations can be proven. Many of these benefits occur through Vitamin D’s positive effect on the immune system
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Recommended intake of vitamin D
The amount of vitamin D you need depends on your age.
Vitamin D intake can be measured in two ways: in micrograms (mcg) and International Units (IU).
One microgram of vitamin D is equal to 40 IU of vitamin D.
The recommended intakes of vitamin D throughout life were updated by the U.S. Institutes of Medicine (IOM) in 2010 and are currently set at:
- Infants 0-12 months – 400 IU (10 mcg).
- Children 1-18 years – 600 IU (15 mcg).
- Adults to age 70 – 600 IU (15 mcg).
- Adults over 70 – 800 IU (20 mcg).
- Pregnant or lactating women – 600 IU (15 mcg).
The Upper Level limit recommended for vitamin D is 4,000 IU per day. Do read “Potential health risks of consuming vitamin D” section below
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Vitamin D deficiency
Although the body can create vitamin D, there are many reasons deficiency can occur. For instance, darker skin color and the use of sunscreen reduce the body’s ability to absorb the ultraviolet radiation B (UVB) rays from the sun needed to produce vitamin D.
A sunscreen with sun protection factor (SPF) 30 can reduce the body’s ability to synthesize the vitamin by 95 percent. To start vitamin D production, the skin has to be directly exposed to sunlight, not covered by clothing.
People who live in northern latitudes or areas of high pollution, work at night and stay home during the day, or are homebound should aim to consume extra vitamin D from food sources whenever possible. Infants who are exclusively breast-fed need a vitamin D supplement, especially if they are dark-skinned or have minimal sun exposure. The American Academy of Pediatrics recommends that all breastfed infants receive 400 IU per day of an oral vitamin D supplement; drops made specifically for babies are available.
Although vitamin D supplements can be taken, it is best to obtain any vitamin or mineral through natural sources wherever possible.
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Vitamin D food sources
Sunlight is the most common and efficient source of vitamin D. The richest food sources of vitamin D are fish oil and fatty fish. Here is a list of foods with good levels of vitamin D:
- cod liver oil, 1 tablespoon: 1,360 IU
- herring, fresh, raw, 4 ounces: 1,056 IU
- swordfish, cooked, 4 ounces: 941 IU
- raw maitake mushrooms, 1 cup: 786 IU
- salmon, sockeye, cooked, 4 ounces: 596 IU
- sardines, canned, 4 ounces: 336 IU
- fortified skim milk, 1 cup: 120 IU
- tuna, canned in water, drained, 3 ounces: 68 IU
- egg, chicken, whole large: 44 IU
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Potential health risks of consuming vitamin D
The Upper Level limit recommended for vitamin D is 4,000 IU per day. However, the National Institutes of Health (NIH) has suggested that vitamin D toxicity is unlikely at daily intakes below 10,000 IU per day.
Excessive consumption of vitamin D (hypervitaminosis D) can lead to over calcification of bones and hardening of blood vessels, kidney, lungs, and heart. The most common symptoms of hypervitaminosis D are headache and nausea but can also include loss of appetite, dry mouth, a metallic taste, vomiting, constipation, and diarrhea.
It is best to get your required Vitamin D from natural sources. When choosing supplements, choose your brand carefully as the FDA does not monitor safety or purity of supplements. If you want to buy Vitamin D supplements, then there is an excellent selection on online with thousands of customer reviews.
It is the total diet or overall eating pattern that is most important in disease prevention and achieving good health. It is better to eat a diet with a variety than to concentrate on one individual nutrient as the key to good health.
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