Featured Research

from universities, journals, and other organizations

Model predicts individual's vitamin D needs

Date:
July 17, 2010
Source:
USDA/Agricultural Research Service
Summary:
Your skin tone and the amount of sunshine you receive -- in addition to what foods you eat -- all can influence the amount of vitamin D that your body has on hand for optimum health. Scientists have now developed a preliminary model that predicts an individual's vitamin D requirements.

Your skin tone and the amount of sunshine you receive--in addition to what foods you eat--all can influence the amount of vitamin D that your body has on hand for optimum health. In a preliminary and apparently first-of-its-kind study, Agricultural Research Service (ARS) research physiologist Charles B. Stephensen and colleagues have developed a preliminary model that predicts an individual's vitamin D requirements.

Related Articles


Stephensen is based at the ARS Western Human Nutrition Research Center at the University of California-Davis.

Scientists have known since the early 20th century that our bodies are stimulated to make vitamin D when ultraviolet rays from the sun reach our skin. But the amount of direct sunlight that a person receives is affected not only by the amount of time spent in the sun, but also by latitude, season, skin pigmentation, and even the amount of protective clothing that one wears.

Some vitamin D comes from food, including salmon and some other fish; milk and breakfast cereals fortified with this essential nutrient, and nutritional supplements such as multivitamin tablets.

The current recommended daily allowance of vitamin D for U.S. adults who are less than 50 years of age is 200 international units.

To develop the preliminary model, Stephensen and co-investigators worked with 72 young adult volunteers who provided intermittent records of what they ate and, for 7- to 8-week stints, wore photosensitive badges from 7 a.m. to 7 p.m. so scientists could determine their level of sun exposure.

Data from the volunteers--either African-American or of European ancestry--who had relatively low amounts of sun exposure suggest that they may need additional vitamin D to reach a target blood level of 75 nanomoles of vitamin D per liter of plasma.

Stephensen cautions, however, that some vitamin D levels indicated by the model exceed the level currently considered safe. More research, with a larger number of volunteers, may refine the predictive power of the model, he reports.

The research was published earlier this year in the Journal of Nutrition.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. The original article was written by Marcia Wood. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Model predicts individual's vitamin D needs." ScienceDaily. ScienceDaily, 17 July 2010. <www.sciencedaily.com/releases/2010/06/100618112133.htm>.
USDA/Agricultural Research Service. (2010, July 17). Model predicts individual's vitamin D needs. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2010/06/100618112133.htm
USDA/Agricultural Research Service. "Model predicts individual's vitamin D needs." ScienceDaily. www.sciencedaily.com/releases/2010/06/100618112133.htm (accessed October 24, 2014).

Share This



More Health & Medicine News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Breakfast Debate: To Eat Or Not To Eat?

Breakfast Debate: To Eat Or Not To Eat?

Newsy (Oct. 23, 2014) Conflicting studies published in the same week re-ignited the debate over whether we should be eating breakfast. Video provided by Newsy
Powered by NewsLook.com
Ebola Fears Keep Guinea Hospitals Empty

Ebola Fears Keep Guinea Hospitals Empty

AP (Oct. 23, 2014) Fears of Ebola are keeping doctors and patients alike away from hospitals in the West African nation of Guinea. (Oct. 23) Video provided by AP
Powered by NewsLook.com
Despite Rising Death Toll, Many Survive Ebola

Despite Rising Death Toll, Many Survive Ebola

AP (Oct. 23, 2014) The family of a Dallas nurse infected with Ebola in the US says doctors can no longer detect the virus in her. Despite the mounting death toll in West Africa, there are survivors there too. (Oct. 23) Video provided by AP
Powered by NewsLook.com
Orthodontist Mom Jennifer Salzer on the Best Time for Braces

Orthodontist Mom Jennifer Salzer on the Best Time for Braces

Working Mother (Oct. 22, 2014) Is your child ready? Video provided by Working Mother
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins