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Study Says Vitamin D Supplements Can Harm Heart

Too Much Vitamin D Can Be Harmful For Your Ticker

In the Summer, we don't need to worry about getting enough vitamin D since we spend so much time in the sun. When cold weather blows in, most of our skin is covered and we spend less time outdoors, so doctors often recommend taking vitamin D supplements. Before you start popping capsules, be warned that a recent study presented at the annual meeting of the American Heart Association shows too much vitamin D can be dangerous for your heart.

When higher than normal levels of vitamin D are found in the blood, it can cause your heart to beat too fast and out of rhythm, a condition known as atrial fibrillation. Taking supplements doesn't automatically put you at risk since people absorb them differently, but high levels of vitamin D only happen in people who take supplements. That means if you do take over-the-counter Vitamin D, it's important to have your blood tested to make sure your levels are within a healthy range (41 to 80 nanograms per deciliter). Also talk with your doctor about the dosage that's right for you.

The RDI of vitamin D for healthy adults is 600 IU (15 micrograms). You can skip the supplements (and the risk to your heart) by making sure to get your fill of vitamin D-rich foods such as milk, soy milk, salmon, tuna, egg yolks, and cheese. For more sources, check out this list of 10 common foods high in vitamin D.

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Cwolf88 Cwolf88 5 years
There are issues with blindly reporting on news releases. This was an observational study. They did not collect other micronutrient data. Therefore, it doesn't "prove" anything. 1. Serum 25(OH)D is measured in ng/ml, NOT ng/dL. 2. You might try adding up the D in those foods to see how much you'd have to eat/day. 3. Here is the summary: http://intermountainhealthcare.org/services/medicalgroup/clinics/physicianclinics/heartrhythmspecialists/aboutus/Pages/News.aspx?NewsID=1018 http://circ.ahajournals.org/cgi/content/meeting_abstract/124/21_MeetingAbstracts/A14699?sid=d8af4ab7-eb16-4360-8e52-179868c1e439 The authors recommend 'normal' D levels at 41-80 ng/ml and regular D testing. They've basically shown that up to 100 ng/ml is good. Only 101 & greater is 'associated' with AF (realizing the AF is as much as 5% amongst older folks >80). Their study also documents "low 25[OH] Vit D (<20) .....associating with a higher prevalence of comorbities (i.e., hypertension, heart failure, diabetes, and renal failure)." You have to be careful with relative risk versus absolute risk. For example, the 6 groupings of serum D had rates ranging from 0.8% to 3.8% AF. Avg was probably 1.5+%. So, AF went up 1.5%. End of the world? And this would have to be compared to the fall & fracture reduction benefits.
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