Body Weight and Vitamin D Blood Levels

Over the years, countless studies have exposed the importance of vitamin D as part of a healthy lifestyle. But many Americans don't know how much they need or how their weight and body composition can affect the dosage.

So, who needs more vitamin D: a 250 pound fit man who has 12 percent totally body fat, or a 250 pound obese man who has 50 percent body fat?

We know vitamin D is a fat-soluble vitamin, but some "common sense" theories, predicated without much if any evidence, would have most of us be live that the 250 pound obese man needs more vitamin D because body fat acts as a "sink", collection fat-soluble vitamins.

Leave it to professors Robert Heaney and reinhold Veith to see the light about the sunshine vitamin. The answer is: The both need the dame amount. Using mathematical models that are beyond my psychiatric training, Dr. Andjela Drincic and colleagues at Creighton University recently wrote a beautiful paper that definitively answered the question.

Therefore, muscle and fat may well act the same when it comes to storing vitamin D for future use. When you try to figure out how much vitamin D someone needs, forget the "fat-sink" theory, as sensible as it sounds, and keep in mind total body weight. However , also keep in mind the obese man may have lower levels to begin with, as obese persons may typically have lifestyles that are void of full body sun exposure.

Finally, I am comforted ny the authors' calculation of vitamin D requirements. Their data suggests that if you want the average person to have a level of 40 ng/mL, that person needs 70-80 IU/kg/day. If you do the math , the 250 pound man would need 7-8,000 IU/day from all sources, while a 125 pound woman would need 3,500-4,000 IU/day from all sources.

It is difficult to make a general recommendation with vitamin D for adults because you don't want to make it too complicated. That's why our almost 10-year-old recommendation is simply 5,000 IU/day, which serves well for the majority of adults.

Smart Tan Magazine- Written by Dr. John Cannell- founder of the Vitamin D Council. He has written many peer-reviewed papers on vitamin D and speaks frequently across the United States on the subject. Dr Cannell holds an M.D. and has served the medical field as a general practitioner, itinerant emergency physician, and psychiatrist.