Tag Archive for: vitamin D

Classic: Vitamin Dumb

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As Paula and I visit our son and his wife this week, I’m choosing what I call Dr. Chet’s Classics. This one from 2010 illustrates two points. First, mega-dosing vitamins and minerals can have consequences that someone might not expect, and “if some is good, more has to be better” is not a good idea unless there’s a genetic or other reason. Second, even with the best intentions, researchers sometimes don’t use their heads when designing research studies.

Researchers reported in JAMA on the effects of vitamin D on fractures and falls in a group of over 1,500 women over 70. The results were surprising in that the vitamin D group had more falls and more fractures than the placebo group. Well, maybe not so surprising.

Remembering to take medications as well as supplements is a problem. So how did the researchers choose to address that issue? Give the women a year’s worth of vitamin D once a year.

That’s right. They gave these subjects 500,000 IU vitamin D once a year. I was almost rendered speechless—500,000 IU? What in nature would give them a model to follow? If you spend all day in the sun without sunblock, your body shuts down the production of vitamin D automatically; that’s why you can’t overdose on D from the sun. But this was oral intake; in what universe did these researchers think this was a good idea? Would they give someone a year’s supply of cholesterol-lowering medication or pain medication in one dose per year just because the subjects might not remember to take their meds every day? And what earthly good would that do?

In an editorial in the same issue, the authors suggested that medical professionals examine how vitamin D is administered, and that maybe administering 50,000–100,000 IU doses isn’t such a good idea.

Do ya think?

Taking up to 10,000 IU vitamin D3 is safe and 2,000-6,000 IU per day is a good goal. But this study illustrates that there’s no need to megadose. Doing that is like taking vitamin Dumb.

What are you prepared to do today?

Dr. Chet

 

Reference: JAMA. 2010;303(18):1815-1822.

 

Changes in Supplement Use

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I take dietary supplements, and so do most of the people I know. We’re not alone. Using data from the NHANES data in 1999 and 2012, researchers compared how many people used supplements and what type of supplements they used (1).

Close to 38,000 subjects were included in the study. The percentage of people using supplements remained fairly stable over the time span at 52%; what changed was the types of supplements people took. Multivitamin-multimineral (MVMM) dropped 6% from 37% to 31%. There were some increases: vitamin D supplementation (other than from MVMM) increased from 5.1 . . .

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Breastfeeding? Take Vitamin D

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To recap the week, breastfed infants do not appear to be getting enough vitamin D. Neither the moms nor the infants are exposed to enough sunlight to make their own vitamin D, especially in winter. Moms who breastfeed and don’t supplement their infants with vitamin D don’t have adequate amounts of vitamin D in their breast milk. That leaves a logical question: what happens if the moms supplement their diet with vitamin D? Two recent studies asked that very question.

In the first study, Australian researchers gave pregnant women either a placebo, 1,000 IU vitamin D3, or . . .

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Vitamin D for Babies

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The next logical question is this: if babies aren’t getting enough vitamin D from breast milk, will supplementing the babies’ diet with vitamin D3 increase vitamin D levels? Researchers examined data collected from the TARGet Kids! primary healthcare research network, a large cross-sectional study conducted in Canada, to answer the question.

The researchers examined data from over 2,500 breastfeeding mothers and infants who had vitamin D levels checked regularly. Those infants who were supplemented with vitamin D while breastfed had higher levels of vitamin D than those who were breastfed without taking a vitamin D supplement. The . . .

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Vitamin D and Breast Milk

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Recent research on vitamin D reinforces the need for supplementation for infants and breastfeeding mothers. For those of you on Facebook, you’ve seen a picture of me with my pretend grandson Riley who will be one this month (when one of your pretend daughters has a baby, it’s your pretend grandchild). I want to make sure he stays healthy as he continues to grow. Vitamin D is important especially because he lives in Grand Rapids where sunshine is at a premium several months of the year. Let’s look at the research.

Breastfeeding is important for many reasons . . .

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The Truth About Sunscreen!

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In today’s message, I’m going to examine the science behind the article on sunscreen that started this week’s look at reposting websites. There are three primary research findings used in the article that are supposed to blow the lid off the myth of sunscreen preventing cancer. Let’s take a look.
“Avoiding the sun doubles all-cause mortality”
This research finding is taken from an epidemiological study done at Sweden’s Karolinska Institute titled the Melanoma in Southern Sweden Study or MISS (1). The data does show that over 20 years in a group of close to . . .

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