Obese need 2X to 3X more vitamin D

Created November 2014

Obese need 2.5 times as much vitamin D as normals

Normal weight Obese (50 ng = 125 nanomole)

The Importance of Body Weight for the Dose Response Relationship of Oral Vitamin D Supplementation and Serum 25-Hydroxyvitamin D in Healthy Volunteers

PLOS ONE, Published: November 05, 2014DOI: 10.1371/journal.pone.0111265

John Paul Ekwaru, Jennifer D. Zwicker, Michael F. Holick, Edward Giovannucci, Paul J. Veugelers

Unlike vitamin D recommendations by the Institute of Medicine, the Clinical Practice Guidelines by the Endocrine Society acknowledge body weight differentials and recommend obese subjects be given two to three times more vitamin D to satisfy their body's vitamin D requirement. However, the Endocrine Society also acknowledges that there are no good studies that clearly justify this. In this study we examined the combined effect of vitamin D supplementation and body weight on serum 25-hydroxyvitamin (25(OH)D) and serum calcium in healthy volunteers.

We analyzed 22,214 recordings of vitamin D supplement use and serum 25(OH)D from 17,614 healthy adult volunteers participating in a preventive health program. This program encourages the use of vitamin D supplementation and monitors its use and serum 25(OH)D and serum calcium levels. Participants reported vitamin D supplementation ranging from 0 to 55,000 IU per day and had serum 25(OH)D levels ranging from 10.1 to 394 nmol/L. The dose response relationship between vitamin D supplementation and serum 25(OH)D followed an exponential curve.

On average, serum 25(OH)D increased by 12.0 nmol/L per 1,000 IU in the supplementation interval of 0 to 1,000 IU per day and by 1.1 nmol/L per 1,000 IU in the supplementation interval of 15,000 to 20,000 IU per day.

BMI, relative to absolute body weight, was found to be the better determinant of 25(OH)D.

Relative to normal weight subjects, obese and overweight participants had serum 25(OH)D that were on average 19.8 nmol/L and 8.0 nmol/L lower, respectively (P<0.001).

We did not observe any increase in the risk for hypercalcemia with increasing vitamin D supplementation.

We recommend vitamin D supplementation be 2 to 3 times higher for obese subjects and 1.5 times higher for overweight subjects relative to normal weight subjects.

This observational study provides body weight specific recommendations to achieve 25(OH)D targets.

📄 Download the PDF from VitaminDWiki

'Even more vitamin D needed if:

Dark Skin color - will take longer to reach equilibrium
Excess toxins such as DDT, PCB, Alcohol
Health problems which consume Vitamin D
Health problems which reduce the response of Vitamin D consumed
- Especially problems of the Liver (even fatty liver) and Kidney
Lacking Cofactors such as Magnesium and Omega-3
Have a high amount of Vitamin A in diet (too much vitamin A blocks vitamin D)
You are smoking – known to reduce dose/response by 20%
Recent surgery/trauma – which consumes a lot of vitamin D
Drugs being taken which reduce vitamin D levels - statins, chemotherapy, etc.
Senior - Vitamin D is not as bio-available
Pregnancy
Using oil form of vitamin D (needs about 20% more)

BMI formula and chart

English BMI Formula

BMI = ( Weight in Pounds / ( Height in inches x Height in inches ) ) x 703

Metric BMI Formula

BMI = ( Weight in Kilograms / ( Height in Meters x Height in Meters ) )

http://www.bmi-calculator.net/

298 citations of the study as of Dec 2023

Google Scholar

Obesity and hypovitaminosis D: causality or casualty? - April 2019 https://doi.org/10.1038/s41367-019-0010-8 FREE PDF
Association of Body Weight With Response to Vitamin D Supplementation and Metabolism - Jan 2023 doi:10.1001/jamanetworkopen.2022.50681 based on VITAL study with 2,000 IU FREE PDF
The Association between Body Mass Index and Vitamin D Supplement Use among Adults in the United States - Sept 2019 DOI: 10.7759/cureus.5721 FREE PDF

short url = https://is.gd/vdwobese

Tags: Obesity