have a thin body in order to be attractive for the Chinese emperor. Later, during the Tang dynasty, a less thin body type was seen as most attractive for Chinese women. In Arabian society in the Middle Ages, a component of the female beauty ideal was for women to be slender like a "cane" or a "twig". In the Chinese text Jeweled Chamber Secrets () from the Six Dynasties period, the ideal woman was described as not being "large-boned". In the Victorian era, women who adhered to Victorian ideals were expected to limit their food consumption to attain the ideal slim figure. In Middle English literature, "slender" women are considered beautiful. According to research on females, women consider a full body with good distribution to be highly important to be considered attractive by men. Waist–hip ratio A WHR of 0.7 for women has been shown to correlate strongly with general health and fertility. Women within the 0.7 range have optimal levels of estrogen and are less susceptible to major diseases such as diabetes, heart disease, and ovarian cancers. Women with high WHR (0.80 or higher) have significantly lower pregnancy rates than women with lower WHRs (0.70–0.79), independent of their BMIs. Female waist-to-hip ratio (WHR) has been proposed by evolutionary psychologists to be an important component of human male mate choice, because this trait is thought to provide a reliable cue to a woman's reproductive value. Both men and women judge women with smaller waist-to-hip ratios more attractive. Ethnic groups vary with regard to their ideal waist-to-hip ratio for women, ranging from 0.6 in China, to 0.8 or 0.9 in parts of South America and Africa, and divergent preferences based on ethnicity, rather than nationality, have also been noted. A study found the Machiguenga people, an isolated indigenous South American ethnic group, prefer women with high WHR (0.9). The preference for heavier women, has been interpreted to belong to societies where there is no risk of obesity. In Chinese, the phrase "willow waist" () is used to denote a beautiful woman by describing her waist as being slender like a willow branch. In the Victorian era, a small waist was considered the main trait of a beautiful woman. The term "wasp waist" describes an extreme fashion silhouette, produced by a style of corset and girdle. Feet size According to some studies, most men prefer women with small feet, such as in