JimJimJimJim Posted September 28, 2012 Share Posted September 28, 2012 At this morning's phone-in support meeting, Dr Snuffy Myers advice on flaxseed oil came up. In this is an extract from a PAACT newsletter (Vol 26 No 4 Dec 2010), Dr Myers advises: Broadly speaking, I prefer my patients to get their nutrition from their diet and if they adopt the Mediterranean diet, this should not prove to be a problem. I think most multivitamins are a joke and generally should never be used. I am also concerned because of one report that the more multivitamins a man takes, the more likely he is to have a problem with prostate cancer. I have repeatedly discussed my concerns with flaxseed oil. The major argument in favor of this oil is that it is a rich source of omega three fats. However, the available evidence shows that the omega three fat in flaxseed oil is much less effective than that found in fish. I simply cannot find any scientific basis for its continued use. Flaxseed oil, under the name of linseed oil, does make fine basis for paint. Chondroitin sulfate is another supplement that I have concerns about. It is commonly used in over-the-counter supplements for joint pain. My first problem is that we lack convincing evidence that this works. My second problem has to do with a similarity between the biochemistry of the joint surface and prostate cancer cells. On the joint surface, chondroitin binds to a protein called versican and in this way is supposed to make the joint surface better lubricated. However, versican is found on the surface of prostate cancer cells and is associated with aggressive cancers. It has been postulated that versican in some way helps the cancer avoid the immune system, but this is pretty much conjecture. So, this is a supplement of dubious value and theoretical risk. Beta carotene is commonly incorporated into multivitamins and patients will often take it as a separate supplement. But, we now have three large randomized controlled trials where beta carotene was associated with an increase in prostate cancer issues. So, until I see convincing evidence to the contrary, I recommend patients not take pills with beta carotene. I do not have a problem with foods rich in beta carotene as those foods contain a rich mixture of potentially valuable nutrients and there is no evidence that these foods offer anything like the risk of beta carotene in pill form. Copper is widely added to multivitamins and other supplements. Yet, there is one provocative study in which the induction of copper deficiency arrested progression of prostate cancer. The results of that trial suggested that the cancer needed the copper more than the patient did! I think extra copper should only be taken if deficiency is documented. This is yet another example of how multivitamins might actually be harmful. Link to comment Share on other sites More sharing options...
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