Just thought I'd put this info up here before I write it up properly.
Some of you realise that B12 deficiency can be caused when stomach acid is low and the pH level of the acid falls so b12 cannot be cleaved from food.
Well another point to note is that I now have it confirmed by a specialist that when a person is suffering from no or low stomach acid (achlorhydria and hypochlorhydria) then neither is intrinsic factor released.
This means, that irrespective of tests for antibodies, someone with low stomach acid cannot cleave or transport the B12. The test for intrinsic factor, as many will know, used to be the Schilling test. This tested as to whether intrinsic factor was present or not. The test then shifted to that of being an autoimmune test. No one really knows the reason why apart from the fact it was cheaper and more convenient.
Anyway, the bottom line is that it appears many b12 deficient patients out there are lacking intrinsic factor and cannot transport b12 (although my argument has always been that you need to be able to cleave it before you can transport it).