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Beautiful parents more likely to have daughters

Very attractive individuals are 26 per cent less likely to have a son, according to research by Dr Satoshi Kanazawa of LSE's Interdisciplinary Institute of Management.

Dr Kanazawa's work has been published in the Journal of Theoretical Beauty|

He explains: 'The generalized Trivers-Willard hypothesis (gTWH) (Kanazawa, 2005) proposes that parents who possess any heritable trait which increases the male reproductive success at a greater rate than female reproductive success in a given environment will have a higher-than-expected offspring sex ratio, and parents who possess any heritable trait which increases the female reproductive success at a greater rate than male reproductive success in a given environment will have a lower-than-expected offspring sex ratio.

'One heritable trait which increases the reproductive success of daughters much more than that of sons is physical attractiveness. I therefore predict that physically attractive parents have a lower-than-expected offspring sex ratio (more daughters).

'Further, if beautiful parents have more daughters and physical attractiveness is heritable, then, over evolutionary history, women should gradually become more attractive than men. The analysis of the National Longitudinal Study of Adolescent Health (Add Health) confirm both of these hypotheses. Very attractive individuals are 26 per cent less likely to have a son, and women are significantly more physically attractive than men in the representative American sample.'

Ends

For more information contact Dr Kanazawa by email: s.kanazawa@lse.ac.uk|

Press cuttings

Daily News & Analysis, India
Bright and beautiful (10 Oct 06)
It's touted as a major discovery of much significance. Beauty and brains do go together, after all, says a research study called Why Beautiful People Are More Intelligent conducted by Satoshi Kanazawa of the London School of Economics and Jody Kovar of Indiana University of Pennsylvania.

Bounty
Beautiful people make beautiful babies (6 Sep 06)
Beautiful mums are more likely to give birth to daughters, with the latest research showing a link between beautiful parents and baby girls. According to a study by LSE, very attractive people are 36 per cent more likely to have a daughter as their firstborn child.

Daily Telegraph
Attractive parents 'have more daughters' (31 July 06 )
Beautiful people not only seem to get richer, live longer and float through life with greater ease than the less visually blessed, they are also changing the face of the world. Researchers at LSE have established that very attractive people are 36 per cent more likely to have daughters than sons and that the world's females are becoming better-looking than men as a result.

United Press International, USA
Attractive couples produce more girls (31 July )
Research at the London School of Economics indicates physically attractive couples are 26 percent more likely to produce daughters than sons. 

The Times
Beautiful people tend to have girls, say scientists (30 July)
Hollywood's most beautiful couple, Brad Pitt and Angelina Jolie, are in the grip of evolutionary forces that made it almost inevitable that their child would be a girl. According to research, attractive parents are 26% more likely to have a daughter than a son as their first child. It is an inexorable process that has resulted in women becoming increasingly more attractive than men.
This is because of differing 'evolutionary strategies' that each sex has adopted to survive, claim researchers at LSE.

posted 31 July 2006

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