Vitamin D is a steroid hormone as the body can manufacture it (via exposure to UVB radiation from sunlight) as well as absorb it from food. So in the dark winter months when safe sun exposure is impossible without going on holiday, your can become depleted in Vitamin D. (see signs). So I want to explain how can you boost your vitamin D levels?
Probably the simplest way it to take a vitamin D supplement, I would recommend D3 as this is the most natural form of vitamin D. In addition vitamin D is found in the following foods.
Wild caught Alaskan salmon
Breakfast cereals fortified with vitamin D
Yoghurt fortified with vitamin D
However it should be noted that it can be difficult to optimise your vitamin D level just from food sources.
Vitamin D is well known to prevent osteoporosis and promote strong bones and teeth but its role in disease prevention is probably less well known. So in the next few blog posts I want to look at its role in disease prevention starting with the immune system.