I just got mine in the mail yesterday and read the article. It WAS confusing but interesting as well. I think over time, they will come up with a better idea of what the levels should be.

MrsD - It's interesting that your brought up cod liver oil as I was thinking about it yesterday. Dr. Swank's diet requires this daily. Additionally, both my parents took cod liver oil every day when they were kids. They rarely ever go sick. Whether it's the omegas (3 and 6), the vitamin D, vitamin A, or a combination of all 4 of these, who knows. But I do find it interesting. It is a strong antiinflammatory as well - probably because of the omega's. One teaspoon provides 113% of vitamin D, 90% vitamin A, 888 mg omega 3, and 42.1 mg omega 6. (http://nutritiondata.self.com/facts/fats-and-oils/628/2) Many people find it very beneficial.

For me, after studying my diet for the past couple of weeks, I get more than the RDA of vitamin D plus I am fortunate that I can soak up some natural vitamin D daily - 15 minutes of sun each day, without sunscreen, and the least amount of clothes I can tolerate without getting too cold. I have not had my levels tested and actually would be surprised if I was low in D based on my dietary intake and sitting in the sun each morning. But, as the Momentum article states, it could be the discrepancies in appropriate levels that can say you are deficient when you actually aren't and vice versa. Who knows. Just IMO, if I were deficient by blood tests, I would definitely start to wonder if I am probably not metabolizing it correctly and therefore creating a deficiency. So my question then would be, why am I not metabolizing it correctly and what can I do to correct it.