The nutritionist at my CF clinic called yesterday and said my vitamin D levels are down. She said they are still in the normal range, but we need to start keeping our eye on it. I asked her if this could be a sign that I am becoming PI (I am currently PS), and she said probably not because all my other fat soluble vitamins are fine, and she has some other PS patients with low vitamin D levels.
So my question: Is there something about us CFers (other than being PI) that could cause us to have low vitamin D levels? I don't understand why mine went down because I jog all the time (so I get decent sun exposure) and haven't changed my diet or vitamins.
So my question: Is there something about us CFers (other than being PI) that could cause us to have low vitamin D levels? I don't understand why mine went down because I jog all the time (so I get decent sun exposure) and haven't changed my diet or vitamins.