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From: Dr Gosia O'Reilly (
Subject:         Re: risk not= cause
Date: April 20, 2015 at 1:31 am PST

In Reply to: Re: risk not= cause posted by Gosia on April 20, 2015 at 12:02 am:


This is not strange at all. This is a standard in science to be very careful when claiming a causal relationship. This is why we do not see (I have not) such claims in the literature on B12. Yes, there are claims about the risks, and these are well substantiated of course, but one needs to be careful when reading such studies, and differentiate between having low B12 levels, or actual symptoms of B12 deficiency, being reported in them.

Also, it is important to read various studies, not only those that agree with our present opinion. Since I found studies which state that long-term unsupplementing vegans may not necessarily have B12 deficiency symptoms, I take a position that there may be some underlying causal factors (which vegan diet may possibly trigger in certain cases).

For example, Audrey who was on 30bad, and got diagnosed with some genetic condition which affects B12 absorption. I see this as a possibility (as suggested by science, which I quoted in my article) that there could be considerable individual differences, which would explain why there are long-term unsupplementing vegans that do not experience B12 deficiency. So although in general, I agree that it may be reasonable to promote B12 supplementation for vegans in the view of the risks, even if those are not well understood, I do not believe that claiming that veganism causes B12 deficiency is correct.

By the way, in relation to the article you quoted (, I found another one which seems related:


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