Autoimmune Thyroid Disease

An Unfortunate and Lengthy Adventure in Misdiagnosis

Natural hunters

with 2 comments

From the latest issue of the New Scientist:

Our ability to detect the characteristic metallic smell left on the skin after handling iron-containing objects like coins and keys may have evolved for a more gory purpose: to help our hunter ancestors track down wounded prey.

Fats on the skin break down to form volatile, strong-smelling substances called ketones and aldehydes when they come into contact with iron – whether it comes from the environment or from haemoglobin in blood – says Dietmar Glindemann, a chemist at Virginia Polytechnic Institute and State University in Blacksburg.

Glindemann and his team identified the chemicals after analysing vapours produced when seven volunteers rubbed metal objects on their skin. The strongest-smelling is 1-octen-3-one, the researchers report in Angewandte Chemie International Edition (vol 45, p 7006).

Glindemann then established that the same chemicals are produced by reactions between iron in blood and chemicals in the skin by rubbing his own blood on his skin and analysing the resultant vapour. He suggests that the ability to detect traces of the smelly chemicals allowed our ancestors to sniff out freshly wounded animals. Ancient human hunters smelt blood on the breeze


Written by alienrobotgirl

27 October, 2006 at 8:38 am

Posted in Historical Diets

2 Responses

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  1. That is disgustingly awesome.

    Mother Nuture

    28 October, 2006 at 3:14 pm

  2. I actually used to get told off all the time when I was a kid for licking the iron back door keys!

    Alien Robot Girl

    29 October, 2006 at 12:23 pm

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