Vitamin D is a popular vitamin in the world of nutrition right now - it seems there's news about vitamin D research every week. Your body needs vitamin D in order to absorb calcium and various research studies have linked deficiencies with several health conditions, including high blood pressure and cardiovascular disease.

Today I read a study published in the American Journal of Cardiology in which the authors looked at vitamin D deficiency, supplementation and cardiovascular disease risk factors like high blood pressure and diabetes. The researchers (not surprisingly) found an association of vitamin D deficiency with an increased risk of cardiovascular disease and also with decreased survival time. So they looked a little closer at the patients who were deficient in vitamin D levels to see if taking vitamin D supplements had any impact on survival times. Turns out the vitamin D deficient-subjects who were taking vitamin D supplements tended to have increased survival times. This was an observational study and not a randomized control trial (which provides the highest form of evidence), so there was no specific dosage used and the subjects weren't required to take any vitamin D. So there was a wide range of dosages reported, from 1,000 International Units per day up to prescription forms of vitamin D taken at 50,000 International Units bi-weekly.

Interestingly, subjects who had cardiovascular disease but were not deficient in vitamin D according to blood tests, but took vitamin D supplements anyway didn't have the same increased survival times. We still have a lot to learn about any therapeutic benefits of vitamin D.

You don't usually get much vitamin D from the foods you eat, although milk is usually fortified with it, you're body makes vitamin D after your skin is exposed to sunlight.

Those of us who live north of a line drawn on a map from the northern border of California in the west to Boston in the east can't even get vitamin D from the sun during the colder months because the sun's rays just aren't strong enough to give us the UV exposure we need. So it's a good idea to take vitamin D supplements during the winter (or any time of the year if you avoid sun exposure).

A study published in the American Journal of Clinical Nutrition came to the conclusion that dietary magnesium intake is inversely associated with the risk of ischemic stroke (these are the strokes caused by blood clots in the brain). The authors performed a meta-analysis, which is a type of study that involves taking the data from previous similar studies and combining them. The authors of the study used the data from seven previous studies and determined that an increased intake of 100 milligrams magnesium per day was associated with an 8 - 9% decreased risk of ischemic stroke. Eight or nine percent may not sound like much, but according to the Internet Stroke Center, stroke is the third highest cause of death in the United States and of those strokes, 88% are ischemic strokes, so something as simple as increasing a dietary mineral could be quite significant.

So this could be a good thing, but, it's important to keep a couple of things in mind with this study. The authors of this study looked at dietary intake of magnesium so it doesn't indicate that taking magnesium supplements will have the same decrease in risk, and it's important (I think) to understand that magnesium deficiency symptoms are uncommon. Also, it's possible that the reduction of stroke risk is caused by other factors besides the actual magnesium since foods that contain magnesium are generally healthy fiber-rich foods - things like whole grains, nuts, seeds and green leafy vegetables. Still, I believe it adds some evidence to the idea that eating magnesium-rich plant-based foods is important for good health.

A reader wants to know if there's a difference between nutritionists and dietitians? Here's my answer: Nutritionist or Dietitian

Have you been to a dietitian or a nutritionist? Or both? Share your experiences and opinions of the two by leaving a comment.

I don't usually do much celebrity blogging, but the news about Paula Deen's being diagnosed with type II diabetes is interesting. I wish her the best in coping with diabetes and all the potential health issues that come with it.

I can't say I watch her show very often (I prefer Anthony Bourdain). For me, too much of what she creates in her kitchen could qualify as "Food Porn" because of it's high-calorie decadence. And yep, eating too much high-calorie food leads to weight gain that increases your risk for diabetes and other health problems like cardiovascular disease and some forms of cancer.

I wonder how this affects her career now. Does it make any difference to you? Do you watch her show? Should she switch to cooking healthier foods or stick to her line that these foods are okay in moderation?