Apparently, the UK weather has gotten so bad that everyone may soon be advised to take vitamin D supplements because of the lack of sunshine.
Previously only people considered at high risk of bone and autoimmune diseases such as pregnant women and those over 65 were recommended to take vitamin D supplements.
New Scientist (2015) 60 Seconds: Extra Sunny D Mooted. New Scientist. 08 August 2015, pp.7.