Whether it's our collective lifestyle or the choice of foods, the number of people with vitamin D deficiency has been growing.

不管是我们的集体生活方式还是食物的选择，缺乏维生素D人的数量一直在增长。

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“The cause of dementia is not vitamin D deficiency, ” said David Llewellyn, a research associate at Cambridge University and the study’s lead author.

这项研究报告的主要作者，剑桥大学的研究助理大卫卢埃林说：“老年痴呆症的原因并不是维生素D缺乏。

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Vitamin D inadequacy was defined as <32 ng/mL, vitamin D insufficiency was defined as 20 to <32 ng/mL, and vitamin D deficiency was defined at <20 ng/mL.

维生素D含量在32ng/mL左右为维生素D缺陷（inadequacy）， 20—32ng/mL为维生素D不足（insufficiency），低于20ng/mL为维生素D缺乏（deficiency）。

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Extreme vitamin D deficiency causes deformities in children and weak bones in adults.

VOA: standard.2010.05.28

Doctors rarely see these conditions. But studies have linked vitamin D deficiency to a number of serious health problems, including heart disease, several types of cancer, osteoporosis,diabetes, Alzheimer's disease and some autoimmune disorders.

VOA: standard.2010.05.28

"Vitamin D has become a very hot topic in medicine now as we are discovering very high levels of vitamin D deficiency in our population, not only in the U.S.,but worldwide" Vitamin D helps our bodies absorb calcium and helps form and maintain strong bones.

VOA: standard.2010.05.28

But in northern Europe, diseases related to vitamin D deficiency, such as rickets, would have become common.

WSJ: Matt Ridley on Human Culture's Effect on Genes | Mind & Matter

But is the prevention of severe vitamin D deficiency such as rickets all we need to know?

FORBES: Vitamin D: Still More Questions Than Answers

The panel will also start work on collecting data to make recommendations on screening for vitamin D deficiency.

WSJ: Vitamin D and Calcium Supplements May Not Stop Fractures