It's called the "sunshine vitamin", because we naturally produce it in our skin in response to the suns rays. But for six months of the year from October to April, 90% of the UK lies too far north to have enough sunshine necessary to make vitamin D, and a large proportion of us are thought to be vitamin D deficient. This is significant because increasing research is linking low vitamin D levels to various cancers, high blood pressure, diabetes, depression, immune disorders, chronic muscle pain and bone loss, to name just a few.
Here are 5 signs that you might not be getting enough vitamin D-