FASEB's annual Experimental Biology meeting took place this week in Washington D.C. Big meeting, good data, very respected. Look for many news stories to come out of this meeting.
The one making headlines today: high intake of Vitamin D and calcium is associated with increased size of brain lesions in older people. Wow, that sounds really bad, right? Maybe not as dire as you might think.
Here's what you need to know
Don't panic yet over your vitamin D and calcium intakes.
This is a correlational study that looked at dietary variables and brain lesions. As such it's essentially a snapshot of a brief moment in a very long life. We can't say that intake of these components produces brain lesions, all we can say is that they co-exist. As this was a society presentation, I can't get some of the numbers I usually like to get you, but you'll note that most stories about this study don't tell you what "high" is. Also, we don't know if the people got their vitamin D and calcium from foods or supplements. Actually, I can assume that the vitamin D is from supplements, we just don't get anywhere near enough in our diet.
In fact, vitamin D deficiency is a very bad thing, and we're seeing more of it now, especially in the elderly, but also in children. In the elderly, vitamin D deficiency can affect quality of living and ability to perform daily tasks of living. What's worse, rickets is making a comeback in the US.
Vitamin D is usually gained through exposure to sunlight, something our older people and young children see less and less of with each passing year. Older people are less able to synthesize vitamin D from skin exposure, and those of us living in northern climates (like Boston) simply don't get sunlight at the correct angle to produce vitamin D for about half the year.
Sunlight is actually the best way to get your vitamin D, and if you exercise some caution you can do it safely. Sunscreen that blocks UVA and UVB prevents the synthesis of vitamin D, so you can't block the sun and get your D as well.
Dietary sources include fortified dairy foods, oily fish (including cod liver oil), liver, and egg yolks.
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