A new paper analyzes the case for vitamin D’s cancer-fighting power by looking at the well-known Hill criteria for examining causality in a biological system. The Hill criteria look at:
1. Strength of association
2. Consistency (repeated observation)
3. Specificity (one agent, one result)
4. Temporality (exposure precedes effect)
5. Biological gradient (dose-response relation)
6. Plausibility (e.g., mechanisms)
7. Coherency (no serious conflict with the generally known facts of the natural history and biology of the disease)
8. Experimental verification (randomized, controlled trial)
9. Analogy with other causal relationships
The theory that solar ultraviolet radiation -- and by extension, vitamin D, which is produced when such radiation strikes your skin -- is a potent cancer fighter satisfies most, if not all, of the criteria. From a scientific point of view, therefore, vitamin D reduces the risk of many forms of cancer and increases survival rates once cancer reaches a detectable stage.
However, public policy often lags behind scientific research. It is to be hoped that the acceptance of the beneficial nature of vitamin D in reducing the risk of cancer and many other diseases will not have too much longer to wait. It is encouraging that the National Academy of Sciences’ Institute of Medicine is currently embarking on a two-year study of vitamin D, and is expected to issue a report in 2010.
|Vitamin D Dose Recommendations
||35 units per pound per day
|Age 5 - 10
|Age 18 - 30
There is no way to know if the above recommendations are correct. The ONLY way to know is to test your blood. You might need 4-5 times the amount recommended above. Ideally your blood level of 25 OH D should be 60ng/ml.