You need sun, who is doubting of that?

http://usatoday30.usatoday.com/news/nation/2005-05-21-doctors-sunshine-good_x.htm

http://www.medpagetoday.com/PrimaryCare/DietNutrition/43267?

The Lancet Diabetes & Endocrinology

Available online 6 December 2013

In Press, Corrected Proof — Note to users

Review

Vitamin D status and ill health: a systematic review

• Prof Philippe Autier, MD^a, b, , , 
• Prof Mathieu Boniol, PhD^a, b, 
• Cécile Pizot, MSc^a, 
• Prof Patrick Mullie,PhD^a, c

• ^a International Prevention Research Institute, Lyon, France
• ^b Strathclyde Institute of Global Public Health at International Prevention Research Institute, Lyon, France
• ^c Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium