Large mammal brains: Why the hell iodine?

Discussions about Waterside Hypotheses of Human Evolution or any other topic related to human evolution.

Moderator: CEngelbrecht

Large mammal brains: Why the hell iodine?

Postby CEngelbrecht » Sat Oct 18, 2014 7:12 am

I can't help but ponder over this fall out from the observation, that the more iodine a mammal species has access to in its diet (e.g. via aquatic foods), the larger the brain it can seemingly potentially evolve.

But why? Why iodine? And why only mammals? Aquatic birds don't develop large brains, aquatic reptiles don't, fish sure don't. Some molluscs like squid aparently can have large brains as well, is that linked to iodine as well?
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