Through observations evolutionary biologists have found a link between the popular fascination for Barbie doll curves (or small waist to hip ratios) in women and a higher disposition of fertility and health.
Worldwide men of diverse backgrounds, ethnicity and ages have ranked women with a small waist to hip ratio of around 0.7(the waist is 70% the size of the hips), irrespective of variance in weight as the most attractive and healthy. This corresponds to scientific assessments that verify a woman with a small waist to hip ratio (WHR) as the most healthy and fertile. WHR is found to be positively correlated with high testosterone and negatively linked to estrogen, thereby high degrees of estrogen lead to low WHR. A high concentration of estrogen in the female body especially after puberty results in nearly 35 pounds of reproductive fat deposited on the hips and thighs rather than on the waist. A study conducted in Netherlands has found that even a slight increase in waist to hip circumference might lead to reproductive problems and infertility, as a woman with a WHR of 0.9 is nearly one third less likely to get pregnant than a woman with a 0.8 WHR. In addition, a higher degree of adult onset diabetes has been observed in women with high WHR. Thereby it could be observed that a female with a more hourglass figure is more fertile and healthy than non-curvaceous or high WHR woman. Male fascination with more curvy women therefore translates into a reasonable indicator of the actual reproductive value of females since the low WHR is associated with high fertility and good health. This is a good example of sexual selection in the evolutionary process.
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