While we recommend Juice Plus+ or any whole food nutritional supplement if you're not eating enough fruits and vegetables, there is one vitamin among vitamins that has seen plenty of research that supports a daily supplement of it. And that is Vitamin D. While Juice Plus+ provides nutrients from a variety of fruits and vegetables, taking a single Vitamin D supplement may not be such a bad thing. But here's one reason why you should carefully consider the amount you supplement daily --
In the era before vitamins and cod-liver oil, children suffering from rickets got the "sunshine cure" to rid them of the deforming condition caused by soft, weak bones. It was also the treatment for tuberculosis.
Deficiency in Vitamin D, which is key to maintaining bone health, has been linked to other disorders, including diabetes, cancers of the breast, colon and prostate, and cardiovascular disease. Now, an international study co-authored by McGill University researcher Brent Richards explains why sunshine and certain foods aren't always enough to ward off a Vitamin D deficiency.
Science has been aware for a while that environment and diet play crucial roles, said Richards, of the Lady Davis Institute for medical research of the Jewish General Hospital, but the genetic role wasn't clear.
"About 50 per cent of our Vitamin D levels are determined by genetic factors - that was known," he said.
But the new study, considered the largest of its kind, found variants in three genes responsible for low Vitamin D levels. The genes are involved with the synthesis, breakdown ortransportof Vitamin D.
Richards and co-author ThomasJ. Wangof Massachusetts General Hospital, with colleagues in Britain, the United States, the Netherlands, Sweden and Finland, assessed 34,000 white people of European descent and found the variations increased the risk of Vitamin D insufficiency by more than double.
Published in the Lancet, the report by the SUNLIGHT consortium (Study of Underlying Genetic Determinants of Vitamin D and Highly Related Traits) notes the condition may affect up to half of all healthy adults in the developed world. The study may help explain why people who should get enough through foods and sun exposure still seem to have low levels of Vitamin D.
"We were surprised at what a large effect these genes have," Richards said. "Some of these genes are very common, and usually common genes have a small effect. But these have such a large effect that 50 per cent of Caucasians would carry one copy of the risk gene. And the effect of having a good copy of this gene is similar to using Vitamin D supplementation."
But people should not run out and start popping vitamins, Richards cautioned.
"This in no way lets us understand whether people should take large doses of Vitamin D, only what genes influence vitamin levels," he said. "We're doing follow-up studies to determine whether or not people who have these risk genes need higher doses of Vitamin D."
Researchers are also looking at whether individuals with certain gene variations would respond better to vitamin supplements. In March, Statistics Canada reported that 10 per cent of Canadians -about 3 million people -had inadequatelevelsof Vitamin D in their blood for optimal bone health, and fully 1.1 million were Vitamin D deficient.
There's speculation that people who live in areas with a lack of sunlight -for example, Canada's northern climes -have an increased riskof Vitamin D deficiency.
Most Vitamin D is made by the body as a natural by-product of the skin's exposure to sunlight. It can also be absorbed by eating Vitamin D-rich foods like egg yolks, saltwater fish and liver, fortified foods or via Vitamin D supplements. There are no definitive studies on the optimal daily Vitamin D dose.
Health Canada recommends daily intake of 200 IU (international units) for people age 50 or less, 400 IU for ages 51 to 70, and 600 IU for those older than 70. Two cups of milk provide 200IUof VitaminD. (source...)
Comments: The best source of Vitamin D is sunshine and specific foods. There are plenty of sources that support taking an individual vitamin D supplement to ensure you get plenty of it, although we still support whole food nutrition for optimal benefits to you and your health. And if you're not getting plenty of fruits and vegetables, you may want to add Juice Plus+ to your diet.
Dr. J. Patrick Havey
The Health & Wellness Institute, PC