This is one of the most forgotten and most important of the vitamins I've been researching. Fair warning---this will end up being multiple posts. I have found too many things to share, to try and put it all in one post.
Vitamin D has many functions in the body, Calcium Balance, Cell Differentiation, Immunity, Insulin Secretion, and Blood Pressure Regulation. It has to ACTIVATED first to do anything.
Vitamin D itself is biologically inactive, and it must be metabolized to its biologically active forms. After it is consumed in the diet or synthesized in the skin, vitamin D enters the circulation and is transported to the liver. In the liver, vitamin D is hydroxylated to form 25-hydroxyvitamin D [25(OH)D], the major circulating form of vitamin D. Increased exposure to sunlight or increased intake of vitamin D increases serum levels of 25(OH)D, making the serum 25(OH)D concentration a useful indicator of vitamin D nutritional status. In the kidney and other tissues, the 25(OH)D 3 -1-hydroxylase enzyme catalyzes a second hydroxylation of 25(OH)D, resulting in the formation of 1alpha,25-dihydroxyvitamin D [1,25(OH)2D]—the most potent form of vitamin D. Most of the physiological effects of vitamin D in the body are related to the activity of 1,25(OH)2D.
Your doc can check your levels. Be specific---you need (25-OH-vitamin D3) level done. While I'm at it---Vitamin D is not really a vitamin---it is a steroid hormone precursor. I found this info in an article on The Heart Scan Blog . John Cannell on Vitamin D
The active form of vitamin D is a steroid (actually a seco-steroid) in the same way that testosterone is a steroid and vitamin D is a hormone in the same way that growth hormone is a hormone. Steroid hormones are substances made from cholesterol, which circulate in the body, and work at distant sites by "setting in motion" genetic protein transcription. That is, both vitamin D and testosterone regulate your genome, the stuff of life. While testosterone is a sex steroid hormone, vitamin D is a pleomorphic (multiple function) steroid hormone.
Now that we have it activated in the body. What is the body gonna do with it? Why is it so important? Let's find out, shall we.
Now we know as post op WLSers, calcium absorption is a real biggy. It is SOP(standard operating procedure) for anyone having WLS to be on a calcium supplement twice a day for the rest of your our lives. Period. Not just any form of calcium either---it must be calcium citrate only, as I pointed out in this post here .
I'll discuss later how calcium and Vitamin D play such an important role in WLS.
Cell DifferentiationIn layman's terms it can help put a stop to cancer.
ImmunityHere we have another example of a vitamin helping with the immune system. How many of you out there in WLSland stay sick about half the time? Are you getting enough of your vitamins???
Insulin SecretionI don't worry too much about this from my personal standpoint. The low carb/ketogenic diet I follow helps me with my insulin resistance.
Blood Pressure RegulationIn short, Vitamin D plays a round about role in helping keep your blood pressure under control. To quote Martha "it's a good thing".
To answer the questions I posed at the beginning of this post,no we probably don't get enough. Hey it's a fat soluble vitamin--we never get enough. Most people don't.
Also most of you just take your calcium/Vitamin D combo. First off most of these forms are the wrong type of calcium--calcium carbonate. Secondly, it is the wrong type of Vitamin D. Vitamin D Must Be Oil Based form. Tablets do not work. You can get Vitamin D from sunlight also.
Well that does it for today. There is still alot of info to go on Vitamin D alone---so stay tuned.