- Study made models which predicted which elderly women would needed Vitamin D supplementation in order to get to 30, 40, 50 and 60 nmol/L.
- Concluded that ALL older women needed supplementation, other than the summer, in order to stay above 20 ng (50 nmol)
- They also noticed that the seasonal variation is NOT sinusoidal
- (which many other studies have assumed)
- Seniors need at least 4,000 IU vitamin D, no test needed – Consensus Jan 2014
- 50,000 IU vitamin D routinely given monthly in New Zealand senior homes since 2011– Dec 2016
- Nursing home residents need Vitamin D 4,000 IU daily or 50,000 IU weekly – Jan 2016
- Supplements to Take in Your 50s, 60s and 70s (vitamin D is the only 1 in all 3) - AARP Dec 2014
- Falls cut in half by 100,000 IU vitamin D monthly - RCT 2016
- Vitamin D supplementation guidelines (adults – 50,000 IU per week) – Feb 2017
- 4700 IU of vitamin D needed by most seniors – an equation -July 2014
- Less vitamin D gets to cells as you age - fewer Vitamin D Receptors - 2004
- So even if blood level is OK the senior receptor limits how much vitamin D actually gets to the cells
10 reasons why seniors need more vitamin D has the following
- Senior skin produces 3X less Vitamin D for the same sun intensity
- Seniors have fewer vitamin D receptors as they age
(The effect of low Vitamin D receptor genes does not show up on vitamin D test results)
- Seniors are indoors more than when when they were younger
not as agile, weaker muscles; frail, no longer enjoy hot temperatures
(if outside, stay in the shade), however, seniors might start outdoor activities like gardening, biking, etc.
- Seniors wear more clothing outdoors than when younger
fear skin cancer/wrinkles, sometimes avoid bright light after cataract surgery
- Seniors often take various drugs which reduce vitamin D (some would not show up on vitamin D test) statins, chemotherapy, anti-depressants, blood pressure, beta-blockers, etc
- Seniors often have one or more diseases which consume vitamin D ( osteoporosis, diabetes, MS, ...)
- Seniors generally put on weight at they age - and a heavier body requires more vitamin D
- Seniors often (40%) have fatty livers – which do not process vitamin D as well
- Seniors not have as much Magnesium needed to use vitamin D
(would not show up on vitamin D test)
- Seniors with poorly functioning kidneys do not process vitamin D as well
(would not show up on vitamin D test) 2009 full text online Also PDF 2009
- Vitamin D is not as bioavailable in senior digestive systems (Stomach acid or intestines?)
- Category Seniors and Vitamin D
- "However, in our data, the mean levels over 3 years show a pattern in which the rise of serum 25(OH)D in spring is steeper than the decrease in autumn, a narrow peak in summer and a wide dip in winter. The result of this pattern is that the optimal model does not exactly follow the seasons. The peak is in the months of July and August; the dip is from December until the end of April. The other months are between these summer and winter levels"
We developed an externally validated simple prediction model to predict serum 25(OH)D levels < 30, < 40, < 50 and 60 nmol/L in older women with risk factors for fractures. The benefit of the model reduces when a higher 25(OH)D threshold is chosen.
Vitamin D deficiency is associated with increased fracture risk in older persons. General supplementation of all older women with vitamin D could cause medicalization and costs. We developed a clinical model to identify insufficient serum 25-hydroxyvitamin D (25(OH)D) status in older women at risk for fractures.
In a sample of 2689 women ≥ 65 years selected from general practices, with at least one risk factor for fractures, a questionnaire was administered and serum 25(OH)D was measured. Multivariable logistic regression models with backward selection were developed to select predictors for insufficient serum 25(OH)D status, using separate thresholds 30, 40, 50 and 60 nmol/L. Internal and external model validations were performed.
Predictors in the models were as follows:
- vitamin D supplementation,
- multivitamin supplementation,
- calcium supplementation,
- daily use of margarine,
- fatty fish ≥ 2×/week,
- ≥ 1 hours/day outdoors in summer,
- season of blood sampling,
- the use of a walking aid and
The AUC was 0.77 for the model using a 30 nmol/L threshold and decreased in the models with higher thresholds to 0.72 for 60 nmol/L. We demonstrate that the model can help to distinguish patients with or without insufficient serum 25(OH)D levels at thresholds of 30 and 40 nmol/L, but not when a threshold of 50 nmol/L is demanded.
This externally validated model can predict the presence of vitamin D insufficiency in women at risk for fractures. The potential clinical benefit of this tool is highly dependent of the chosen 25(OH)D threshold and decreases when a higher threshold is used.
730 visitors, last modified 29 May, 2018, URL: