A bigger waist in women might be the key to economic success and compensate her in other beneficial ways.
A thin waist with wide hips and matching bust are what many would consider desirable, but they might not quite make for the best possible outcome.
The hormones that make women physically stronger, more competitive and better able to deal with stress also tend to redistribute fat from the hips to the waist, according to anthropologist Elizabeth Cashdan, University of Utah.
“The hormonal profile associated with high WHR (waist-to-hip ratio) may favour success in resource competition, particularly under stressful circumstances,” wrote Cashdan.
Androgens, a class of hormones that includes testosterone, increase waist-to-hip ratios in women by increasing visceral fat, which is carried around the waist.
“The androgenic effects – stamina, initiative, risk-proneness, assertiveness, dominance – should be particularly useful where a woman must depend on her own resources to support herself and her family.”
In other words, trading the benefits of a thin waist for better ability to collect resources may be a good deal in certain societies and situations. And there is evidence that male mate preferences may reflect this trade-off, according to Cashdan.
Increased androgen levels are also associated with increased strength, stamina, and competitiveness. Cortisol, a hormone that helps the body deal with stressful situations, also increases fat carried around the waist.
So in societies and situations where women are under pressure to procure resources, they may be less likely to have the classic hourglass figure, according to an Utah release.
Cashdan’s hypothesis aims to explain a peculiar observation. Women around the world tend to have larger waist-to-hip ratios – more cylindrical rather than hourglass-shaped bodies – than is considered optimal.
Medical studies have shown that a curvy waist-to-hip ratio of 0.7 or lower is associated with higher fertility and lower rates of chronic disease. Studies have also shown that men prefer a ratio of 0.7 or lower when looking for a mate.
The preference makes perfect sense, according to evolutionary psychologists, because the low ratio is a reliable signal of a healthy, fertile woman.
But in data that Cashdan compiled from 33 non-Western populations and four European populations, the average waist-to-hip ratio for women is above 0.8.
If 0.7 is the magic number both in terms of health and male mate choice, why are most women significantly higher?
In Japan, Greece and Portugal, where women tend to be less economically independent, men place a higher value on a thin waist than men in Britain or Denmark, where there tends to be more sexual equality.
And in some non-Western societies where food is scarce and women bear the responsibility for finding it, men actually prefer larger waist-to-hip ratios.
The study appeared in the December issue of Current Anthropology.
Yea True, said one regular customer of Bombay Red light area, “I know one women who satisfy 10 to 12 customer a night when other handle only 4 to six.”