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Author Topic: Large variation of iodine levels in cat food  (Read 2417 times)
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Mark T
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« on: March 13, 2010, 10:53:35 AM »

There was a time not long ago when feline hyperthyroidism was rarely seen, now it is the most common endocrine disorder of middle-aged to old cats in the United States. It is still unclear what the causes are. It has been suggested (I do not have the ref to hand) that cats do better with a constant level of iodine in their diet and that frequently changing levels may precipitate hyperT.

This study from 2002 tested iodine levels in 92 foods and found levels varied by a factor of 30,(minimum: 218; maximum: 6356 µg iodine/kg DM).

http://jn.nutrition.org/cgi/content/full/132/6/1751S
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catbird
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« Reply #1 on: March 13, 2010, 11:39:24 AM »

MarkT, thank you for posting this.  I have been wondering about the influence of dietary iodine on feline hyperthyroidism for a long time, particularly since finding out that there is no real "standard" for how much or how little iodine should be included in cat food.  I know that various things, including canned food and can liners have been blamed, but have always thought those to be red herrings, so to speak.
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The problem with cats is that they get the exact same look on their face whether they see a moth or an axe-murderer--Paula Poundstone
Mark T
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« Reply #2 on: March 13, 2010, 02:30:54 PM »

Quote
Recommended iodine levels have been reported by several authors; however, figures disagree by a factor of 10 to 30

In a natural prey diet I doubt there would be this variance from mouse to mouse or mouse to bird.

Where would I look to find the nutritional analysis of a mouse or bird, I seem to remember seeing it somewhere but cannot remember where?

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caylee
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« Reply #3 on: March 14, 2010, 09:21:43 AM »

I think that I read something about the nutritional analysis of a mouse here on itchmo but do not have a clue as to where or even begin to search - maybe you could try searching the Kaffe/Cato food threads for this information.

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Spartycats
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« Reply #4 on: March 15, 2010, 05:28:22 AM »

This is the source which has been mentioned here before.  Iodine is not included.

http://www.nal.usda.gov/awic/zoo/WholePreyFinal02May29.pdf
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