craigdolphin wrote...
For a superficial example: it should be pretty obvious that small waists are an important visual clue that a woman is not already pregnant with someone else's child. The law of probabilities suggests then that, over evolutionary time and all else being equal, men who exhibit a heritable preference for small waists in their choice of mates are more likely to produce offspring than a similar man with the inverse preference. Thus the trait for small waist preference is more likely to be passed on to future generations unless there is some other harmful outward manifestation that results from the exact same genes that are responsible for the small waist preference.
Whereas I agree on almost everything you said, I think you're wrong to state that nature is the driving force behind waist preference. Whereas it is obvious that the width of the hips is purely genetic, I don't see many genes contributing to the waist width; maybe some genes that determine how easily you can store sugars and fat. It seems, to me, that the main factors are (i) amount of food, (ii) types of food and (iii) and amount of energy required to do the thinks you do. And hence, as to be expected, it is observed that the preference in waists widths is mainly a function of the availability of food in the considered region. In 'poor' countries people in general prefere 'fat' people because it is unconsciously linked with access to food, which means that their children won't starve to dead. In 'richer' countries their is no shortage of food and hence a small waist is linked with healthy food and sport.




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