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Kelly J. Cooper

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B12 [Jan. 24th, 2010|11:46 pm]
Kelly J. Cooper
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Fun Fact: Cereal, that which we have all long mocked as adjacent to this nutritious breakfast (even when fortified with vitamins and minerals), has the highest oral bioavailability of B12 next to beef liver (eauggh).
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Comments:
From: selkiechick
2010-01-25 03:54 am (UTC)
Hmmm, maybe I will go out and buy me a box of Cheerios!
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[User Picture]From: ceo
2010-01-25 12:28 pm (UTC)
huh huh huh... she said "oral bioavailability"...
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[User Picture]From: miss_chance
2010-01-25 01:13 pm (UTC)
Does that include taking a B12-supplement as an option? (By which I mean, I know some vitamins are just better accessed through food than through supplements, so I'm wondering if the oral bioavailability of B12 is being compared to its availability in other foods only for this study, or also to its o-ba when taken alone or with other supplements.)
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[User Picture]From: kjc
2010-01-25 01:30 pm (UTC)
Yep. B-12 supplements have extremely poor oral bioavailability.

Which is why, if you are critically low in B-12, you get intramuscular shots of the stuff.
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[User Picture]From: miss_chance
2010-01-25 01:53 pm (UTC)
hmmm... interesting. My doc sez I'm anemic, but not low in iron-- that my red blood cells are unusually large, which usually points to a B12 deficiency. I told her "but I take a B12 every day," and she said, well let's be sure to get you back in here to test your B12 levels." so... um, yeah, maybe it would be a good idea for me to prioritize actually doing that.

iiinteresting... thanks!
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[User Picture]From: kjc
2010-01-25 02:04 pm (UTC)
Yep, you should do that. The side effects of B-12 deficiency are bad.

This is a good summary of B-12 anemia:
http://www.nlm.nih.gov/medlineplus/ency/article/000574.htm

And this is a MUCH longer, but more detailed discussion of B-12 and all the various elements of how your body gets it & uses it and what goes wrong when you don't have enough.
http://ods.od.nih.gov/factsheets/vitaminb12.asp
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[User Picture]From: 42itous
2010-01-25 11:29 pm (UTC)
Doesn't it depend on the cereal?
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[User Picture]From: kjc
2010-01-26 02:58 am (UTC)
Sure, some cereals are likely to have more B-12 than others, but I doubt it matters much. Most of them are fortified, even the super sugary ones, with the same plant-based B-12 stuff. Clearly, reading the nutrition information is a better guide than I am, but most of the variation between cereals seems to be in the fiber content and calorie count.
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