Ask a Scientist -- Dr. Robert Scragg
Questions and Answers with Dr. Robert Scragg, MD, PhD
Professor of Epidemiology
Head of the Section of Epidemiology & Biostatistics
University of Auckland, New Zealand
Response to newsletter, August 5, 2015
This newsletter profiled our 60% lower rate of Diabetes. Our latest paper, just published with YOUR Data, shows a full 60% lower rate of incidence of type 2 diabetes with our median serum level of 41 ng/ml vs.the NHANES median of 22 ng/ml.
Vitamin D and Grey Hair
Q: I am 68, taking 15k, and have noticed my hair has pretty much stopped greying and in several areas it seems to be growing in now in non-gray hairs. Is this a natural occurrence for folks taking higher doses (proper doses) of Vitamin D3?
A: I am not aware of any research on whether vitamin D prevents or reverses the greying of hair with age. Your observation is very interesting. But it would need to be confirmed by a double-blind randomized controlled trial of vitamin D supplementation before we could be certain that vitamin D has this effect. If it did, I am sure there would be plenty of takers to get this benefit!
Vitamin D in New Zealand
Q: How is it that people living in New Zealand, where there is plenty of sunshine, need to take a Vit D3 supplement? Are their levels generally too low and if so why is this? I live in the UK and can understand the need as we have so little sunshine available.
A: Surprisingly, vitamin D levels, as measured by the main blood marker (25-hydroxyvitamin D), are lower in New Zealand than in the USA. There are three possible reasons for this.