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	<title>Comments on: Is Vitamin E Deficiency Good for Your Brain?</title>
	<link>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/</link>
	<description>Putting Science First.</description>
	<pubDate>Thu, 20 Nov 2008 15:54:08 +0000</pubDate>
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		<title>By: CP</title>
		<link>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18582</link>
		<author>CP</author>
		<pubDate>Fri, 11 Jan 2008 16:16:50 +0000</pubDate>
		<guid>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18582</guid>
					<description>How delightfully counter-intuitive. Clearly vitamin E deficiency is bad for you on the balance, with the ataxia and neurodegeneration suggesting that it's specifically bad for the brain. Could these results possibly indicate that tocopherol has an important mechanism that is completely unrelated to superoxide?

By the way -- happy new year, Baste, and welcome back!</description>
		<content:encoded><![CDATA[<p>How delightfully counter-intuitive. Clearly vitamin E deficiency is bad for you on the balance, with the ataxia and neurodegeneration suggesting that it&#8217;s specifically bad for the brain. Could these results possibly indicate that tocopherol has an important mechanism that is completely unrelated to superoxide?</p>
<p>By the way &#8212; happy new year, Baste, and welcome back!</p>
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		<title>By: Curious</title>
		<link>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18682</link>
		<author>Curious</author>
		<pubDate>Sat, 12 Jan 2008 15:09:14 +0000</pubDate>
		<guid>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18682</guid>
					<description>Hm, ok but... why only look at alpha-tocopherol? Vitamin E is not only alpha-tocoherol but rather eight vitamers and it has been known for some time that supplementation of only alpha-tocopherol is not optimal but rather negative since it depletes the other vitamers. I do not see this beeing addressed  at all.</description>
		<content:encoded><![CDATA[<p>Hm, ok but&#8230; why only look at alpha-tocopherol? Vitamin E is not only alpha-tocoherol but rather eight vitamers and it has been known for some time that supplementation of only alpha-tocopherol is not optimal but rather negative since it depletes the other vitamers. I do not see this beeing addressed  at all.</p>
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		<title>By: CP</title>
		<link>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18781</link>
		<author>CP</author>
		<pubDate>Mon, 14 Jan 2008 20:26:02 +0000</pubDate>
		<guid>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18781</guid>
					<description>Curious -- I hadn't heard that before. I'd love to see a reference on that subject if you've got one handy.</description>
		<content:encoded><![CDATA[<p>Curious &#8212; I hadn&#8217;t heard that before. I&#8217;d love to see a reference on that subject if you&#8217;ve got one handy.</p>
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		<title>By: Baste</title>
		<link>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18798</link>
		<author>Baste</author>
		<pubDate>Tue, 15 Jan 2008 03:22:56 +0000</pubDate>
		<guid>http://pharmaco-nutrition.net/2008/01/11/is-vitamin-e-deficiency-good-for-your-brain/#comment-18798</guid>
					<description>Hi CP, hi Curious,

thanks for you comments and the vitamin E article!

I agree:
a) that alpha-toc must not be underestimated in its importance for various body functions (especially in the brain) - although clinical signs of alpha-toc deficiency are very rare in otherwise healthy humans,
b) that alpha-toc is certainly more than a direct free radical/ROS scavenger, and
c) that there's indeed a trend to look at other vitamine E derivatives, in particular gamma-toc, which is more abundant than alpha-toc in many human diets.

Below a list of recent articles especially addressing latter question:

Wolf G:
How an increased intake of alpha-tocopherol can suppress the bioavailability of gamma-tocopherol.
Nutr. Rev. 2006;64(6):&lt;a href="http://www.ncbi.nlm.nih.gov/pubmed/16808116?ordinalpos=30&#038;itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum" rel="nofollow"&gt;295-9&lt;/a&gt;

Comment on Nutr. Rev. 64(6):295-9:
Parker RS:
A recent brief critical review on how an increased intake of alpha-tocopherol can suppress the bioavailability of gamma-tocopher.
Nutr. Rev. 2007;65(3):139

Devaraj S et al.:
Failure of vitamin E in clinical trials: is gamma-tocopherol the answer?
Nutr. Rev. 2005;63(8):290-3

Reboul E et al.:
Effect of the main dietary antioxidants (carotenoids, gamma-tocopherol, polyphenols, and vitamin C) on alpha-tocopherol absorption.
Eur. J. Clin. Nutr. 2007;61(10):1167-73

Yoshikawa S et al.:
The effect of gamma-tocopherol administration on alpha-tocopherol levels and metabolism in humans.
Eur J Clin Nutr. 2005;59(8):900-5.

Sundl I et al.:
The decrease in gamma-tocopherol in plasma and lipoprotein fractions levels off within two days of vitamin E supplementation.
Ann N Y Acad Sci. 2004;1031:378-80

Wagner KH et al.:
Gamma-tocopherol--an underestimated vitamin?
Ann Nutr Metab. 2004;48(3):&lt;a href="http://www.ncbi.nlm.nih.gov/pubmed/15256801?ordinalpos=71&#038;itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum" rel="nofollow"&gt;169-88&lt;/a&gt;

Jiang Q et al.:
gamma-tocopherol, the major form of vitamin E in the US diet, deserves more attention.
Am J Clin Nutr. 2001;74(6):&lt;a href="http://www.ncbi.nlm.nih.gov/pubmed/11722951?ordinalpos=1&#038;itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum" rel="nofollow"&gt;714-22&lt;/a&gt;</description>
		<content:encoded><![CDATA[<p>Hi CP, hi Curious,</p>
<p>thanks for you comments and the vitamin E article!</p>
<p>I agree:<br />
a) that alpha-toc must not be underestimated in its importance for various body functions (especially in the brain) - although clinical signs of alpha-toc deficiency are very rare in otherwise healthy humans,<br />
b) that alpha-toc is certainly more than a direct free radical/ROS scavenger, and<br />
c) that there&#8217;s indeed a trend to look at other vitamine E derivatives, in particular gamma-toc, which is more abundant than alpha-toc in many human diets.</p>
<p>Below a list of recent articles especially addressing latter question:</p>
<p>Wolf G:<br />
How an increased intake of alpha-tocopherol can suppress the bioavailability of gamma-tocopherol.<br />
Nutr. Rev. 2006;64(6):<a href="http://www.ncbi.nlm.nih.gov/pubmed/16808116?ordinalpos=30&#038;itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum" rel="nofollow">295-9</a></p>
<p>Comment on Nutr. Rev. 64(6):295-9:<br />
Parker RS:<br />
A recent brief critical review on how an increased intake of alpha-tocopherol can suppress the bioavailability of gamma-tocopher.<br />
Nutr. Rev. 2007;65(3):139</p>
<p>Devaraj S et al.:<br />
Failure of vitamin E in clinical trials: is gamma-tocopherol the answer?<br />
Nutr. Rev. 2005;63(8):290-3</p>
<p>Reboul E et al.:<br />
Effect of the main dietary antioxidants (carotenoids, gamma-tocopherol, polyphenols, and vitamin C) on alpha-tocopherol absorption.<br />
Eur. J. Clin. Nutr. 2007;61(10):1167-73</p>
<p>Yoshikawa S et al.:<br />
The effect of gamma-tocopherol administration on alpha-tocopherol levels and metabolism in humans.<br />
Eur J Clin Nutr. 2005;59(8):900-5.</p>
<p>Sundl I et al.:<br />
The decrease in gamma-tocopherol in plasma and lipoprotein fractions levels off within two days of vitamin E supplementation.<br />
Ann N Y Acad Sci. 2004;1031:378-80</p>
<p>Wagner KH et al.:<br />
Gamma-tocopherol&#8211;an underestimated vitamin?<br />
Ann Nutr Metab. 2004;48(3):<a href="http://www.ncbi.nlm.nih.gov/pubmed/15256801?ordinalpos=71&#038;itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum" rel="nofollow">169-88</a></p>
<p>Jiang Q et al.:<br />
gamma-tocopherol, the major form of vitamin E in the US diet, deserves more attention.<br />
Am J Clin Nutr. 2001;74(6):<a href="http://www.ncbi.nlm.nih.gov/pubmed/11722951?ordinalpos=1&#038;itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum" rel="nofollow">714-22</a></p>
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