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Genetics determine winter vitamin D status

Date:
November 21, 2010
Source:
American Society for Nutrition
Summary:
During the winter, vitamin D status is governed mainly by genetic factors. Conversely, non-genetic factors are most important during the summer. Future studies designed to better understand what these factors are will be especially useful as public health experts continue to explore ways to increase vitamin D status in different populations living under varying environmental and dietary situations.

Vitamin D is somewhat of an unusual "vitamin," because it can be made in the body from sunlight and most foods do not contain vitamin D unless added by fortification. Synthesis of vitamin D in the body requires exposure to ultraviolet light and can be influenced by genetics, skin color, and sun exposure.

Reports of greater than expected vitamin D insufficiency coupled with emerging evidence that higher circulating concentrations of this nutrient may protect against cardiovascular disease have prompted a renewed interest in teasing out how environment, genetics, and behavior work independently and coordinately to influence vitamin D status. To help clarify this, researchers at Emory University studied vitamin D status in twins living in different North American locations.

"The results of the Karohl study are quite important," according to American Society for Nutrition Spokesperson Shelley McGuire, PhD. "Over the past couple decades, nutrition scientists have discovered that maintaining optimal vitamin D status is important for much more than keeping our bones strong. It's also critical for keeping our immune systems healthy and may help protect against diseases like heart disease and cancer. This study suggests that, whereas genetic differences impact winter vitamin D status, lifestyle choices and sun exposure (factors we can control) are predominant in the summer months. Additional research is still needed in more heterogeneous populations."

The authors concluded that during the winter vitamin D status is governed mainly by genetic factors. Conversely, non-genetic factors are most important during the summer. Future studies designed to better understand what these factors are will be especially useful as public health experts continue to explore ways to increase vitamin D status in different populations living under varying environmental and dietary situations.


Story Source:

The above story is based on materials provided by American Society for Nutrition. Note: Materials may be edited for content and length.


Journal Reference:

  1. C. Karohl, S. Su, M. Kumari, V. Tangpricha, E. Veledar, V. Vaccarino, P. Raggi. Heritability and seasonal variability of vitamin D concentrations in male twins. American Journal of Clinical Nutrition, 2010; DOI: 10.3945/ajcn.2010.30176

Cite This Page:

American Society for Nutrition. "Genetics determine winter vitamin D status." ScienceDaily. ScienceDaily, 21 November 2010. <www.sciencedaily.com/releases/2010/11/101118123845.htm>.
American Society for Nutrition. (2010, November 21). Genetics determine winter vitamin D status. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2010/11/101118123845.htm
American Society for Nutrition. "Genetics determine winter vitamin D status." ScienceDaily. www.sciencedaily.com/releases/2010/11/101118123845.htm (accessed July 22, 2014).

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