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==Food affecting the waist circumference==
==Food affecting the waist circumference==

A number of studies have been carried out with focus on food composition of diets in relation to changes in waist circumference adjusted for body mass index.

Whole-grain ready-to-eat oat cereal diets, reduces [[low-density lipoprotein cholesterol]] and waist circumference in adults with overweight and obesity more than low-fiber control food diets.<ref>http://www.ncbi.nlm.nih.gov/pubmed/20102847</ref>
Whole-grain ready-to-eat oat cereal diets, reduces [[low-density lipoprotein cholesterol]] and waist circumference in adults with overweight and obesity more than low-fiber control food diets.<ref>http://www.ncbi.nlm.nih.gov/pubmed/20102847</ref>


One study suggest that consuming a diet high in fruit, vegetables, reduced-fat dairy, and whole grains and low in red and processed meat, fast food, and soda was associated with smaller gains in BMI and waist circumference.<ref>http://www.ncbi.nlm.nih.gov/pubmed/12791618</ref>
One study suggest that consuming a diet high in fruit, vegetables, reduced-fat dairy, and whole grains and low in red and processed meat, fast food, and soda was associated with smaller gains in BMI and waist circumference.<ref>http://www.ncbi.nlm.nih.gov/pubmed/12791618</ref>

A 2011 study suggest that dietary pattern high in fruit and dairy and low in white bread, processed meat, margarine, and soft drinks may help to prevent abdominal fat accumulation.<ref>http://www.ncbi.nlm.nih.gov/pubmed/21858094</ref>


==See also==
==See also==

Revision as of 00:39, 5 June 2014

Measurement of waist hip ratio: In a lean person (left), the waist can be measured at its narrowest point, while for a person with convex waist (right), it may be measured at about one inch[1] above the navel. The hip is measured at its widest portion of the buttocks at left, and at the greater trochanters at right.

Waist–hip ratio or waist-to-hip ratio (WHR) is the ratio of the circumference of the waist to that of the hips.

Measurement

WHO protocol

According to the World Health Organisation's data gathering protocol,[2] the waist circumference should be measured at the midpoint between the lower margin of the last palpable rib and the top of the iliac crest, using a stretch‐resistant tape that provides a constant 100 g tension. Hip circumference should be measured around the widest portion of the buttocks, with the tape parallel to the floor.[3] Other organizations use slightly different standards. The United States National Institutes of Health and the National Health and Nutrition Examination Survey used results obtained by measuring at the top of the iliac crest. Waist measurements are usually obtained by lay persons by measuring around the waist at the umbilicus, but research has shown that these measurements may underestimate the true waist circumference.[3]

For both measurements, the individual should stand with feet close together, arms at the side and body weight evenly distributed, and should wear little clothing. The subject should be relaxed, and the measurements should be taken at the end of a normal expiration. Each measurement should be repeated twice; if the measurements are within 1 cm of one another, the average should be calculated. If the difference between the two measurements exceeds 1 cm, the two measurements should be repeated.[3]

Practical measurement

Practically, however, the waist is more conveniently measured simply at the smallest circumference of the natural waist, usually just above the belly button, and the hip circumference may likewise be measured at its widest part of the buttocks or hip.[4] Also, in case the waist is convex rather than concave, such as is the case in pregnancy and obesity, the waist may be measured at a horizontal level 1 inch above the navel.[1]

Indicator of health

The WHR has been used as an indicator or measure of the health of a person, and the risk of developing serious health conditions. Research shows that people with "apple-shaped" bodies (with more weight around the waist) face more health risks than those with "pear-shaped" bodies who carry more weight around the hips.

WHR is used as a measurement of obesity, which in turn is a possible indicator of other more serious health conditions.

WHO STEPS states that abdominal obesity is defined as a waist–hip ratio above 0.90 for males and above 0.85 for females, or a body mass index (BMI) above 30.0.[5] The National Institute of Diabetes, Digestive and Kidney Diseases (NIDDK) states that women with waist–hip ratios of more than 0.8, and men with more than 1.0, are at increased health risk because of their fat distribution.[6]

WHR has been found to be a more efficient predictor of mortality in older people than waist circumference or BMI.[7] If obesity is redefined using WHR instead of BMI, the proportion of people categorized as at risk of heart attack worldwide increases threefold.[8] The body fat percentage is considered to be an even more accurate measure of relative weight. Of these three measurements, only the waist–hip ratio takes account of the differences in body structure. Hence, it is possible for two women to have vastly different body mass indices but the same waist–hip ratio, or to have the same body mass index but vastly different waist–hip ratios.

Even in ancient civilizations globally, female representations are most often in the 0.6-0.7 range for WHR, suggesting a preference towards lower WHR.[9]

WHR has been shown to be a better predictor of cardiovascular disease than waist circumference and body-mass index.[10] However, other studies have found that waist circumference, not WHR, to be a good indicator of cardiovascular risk factors,[11] body fat distribution[12] and hypertension in type 2 diabetes.[13]

Fertility

A WHR of 0.7 for women and 0.9 for men 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, cardiovascular disorders and ovarian cancers.[14] 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.[9] Men with WHRs around 0.9, similarly, have been shown to be more healthy and fertile with less prostate cancer and testicular cancer.[15]

Evidence suggests that WHR is an accurate somatic indicator of reproductive endocrinological status and long-term health risk. Among girls with identical body weights, those with lower WHRs show earlier pubertal endocrine activity, as measured by high levels of lutenizing hormone (LH) and follicle-stimulating hormone (FSH) as well as sex steroid (estradiol) activity. A Dutch prospective study on outcome in an artificial insemination program provides evidence for the role of WHR and fecundity (Zaadstra et al. 1993). These investigators report that a 0.1 unit increase in WHR decreases the probability of conception per cycle by 30% after adjustment for age, fatness, reasons for artificial insemination, cycle length and regularity, smoking, and parity.[16][17]

Cognitive ability

Using data from the U.S. National Center for Health Statistics, William Lassek at the University of Pittsburgh in Pennsylvania and Steven Gaulin of the University of California, Santa Barbara, found a child's performance in cognitive tests correlated to their mother's waist-hip ratio, a proxy for how much fat she stores on her hips.[18]

Children whose mothers had wide hips and a low waist-hip ratio scored highest, leading Lassek and Gaulin to suggest that fetuses benefit from hip fat, which contains long chain polyunsaturated fatty acids, critical for the development of the fetus's brain.[18] In addition, evidence suggests that children of low-WHR teens were protected from the cognitive deficits often associated with teen birth.

Measure of attractiveness

The concept and significance of WHR as an indicator of attractiveness was first theorized by evolutionary psychologist Devendra Singh at the University of Texas at Austin in 1993.[19][20] Singh argued that the WHR was a more consistent estrogen marker than the Bust–waist ratio (BWR) studied at King's College, London by Dr. Glenn Wilson in the 1970s.[21][22]

Some researchers have found that the waist-hip ratio (WHR) is a significant measure of female attractiveness.[23] Women with a 0.7 WHR are usually rated as more attractive by men from Indo-European cultures.[24] Preferences may vary, according to some studies,[25] ranging from 0.6 in China, South America, and some of Africa[26] to 0.8 in Cameroon and among the Hazda tribe of Tanzania,[15][27][28] with divergent preferences according the ethnicity of the observed being noted.[29][30]

It appears that men are more influenced by female waist-size than hip-size:

"Hip size indicates pelvic size and the amount of additional fat storage that can be used as a source of energy. Waist size conveys information such as current reproductive status or health status ... in westernized societies with no risk of seasonal lack of food, the waist, conveying information about fecundity and health status, will be more important than hip size for assessing a female's attractiveness."

— Journal of Biological Psychology, [31]

By western standards, women in foraging populations have high numbers of pregnancies, high parasite loads, and high caloric dependence on fibrous foods. These variables change across cultures, suggesting that

  1. the normal range of female WHR was often higher than in western cultures,
  2. what constituted locally “WHR” varied, and
  3. average WHR of nubile females and of females of peak fertility varied.

Thus, a WHR that indicates pubertal onset, sex, fertility, hormonal irregularities, and/or differentiates male from female in one population may not do so in another.[32]

In a series of studies done by Singh (1993), men used WHR and fat distribution to determine a woman’s attractiveness. In his first study, men were shown a series of 12 drawings of women with various WHR’s and body fat distribution. Drawings with normal body fat distribution and a moderate WHR were associated with the most positive traits (i.e. attractive, sexy, intelligent and healthy). The drawings with the low WHR were not associated with any positive traits except youthfulness.[33]

Through this study, Singh suggests that males and females may have developed innate mechanisms which detect and make use of the WHR to assess how healthy an individual is and (particularly for men), infer possible mate value. Having a healthy mate improves the chances of producing offspring with inherited genetic protection from various diseases and a healthy mate is more likely to be a good parent (Hamilton & Zuk, 1982; Thornhill, 1993).[34]

Other studies discovered WHR as a signal of attractiveness as well, beyond just examining body fat and fertility. For example, Barnaby Dixson, Gina Grimshaw, Wayne Linklater, and Alan Dixson conducted a study using eye-tracking techniques to evaluate men's fixation on digitally altered photographs of the same woman, as well as asking the men to evaluate the images based on attractiveness. What they found was while men fixated on the woman's breasts in each photo, they selected the images where the woman had a 0.7 WHR as most attractive, regardless of breast size.[35]

Furthermore, referencing a 2005 study conducted by Johnson and Tassinary looking at animated human walking stimuli, Farid Pazhoohi and James R. Liddle proposed that men do not solely use WHR to evaluate attractiveness, but also a means of sex-differentiation, with higher WHR perceived as more masculine and lower WHR as an indicator of femininity. Pazhoohi and Liddle used this idea as a possible additional explanation as to why men perceive a lower WHR as more attractive - because it relates to an expression of femininity, as opposed to masculinity and a higher WHR.[36] On this basis, it was shown that men with lower, more feminine, WHRs feel less comfortable and self-report lower body esteem and self-efficacy than men with higher, more masculine, WHRs.[37]

To enhance their perceived attractiveness, some women may artificially alter their apparent WHR. The methods include the use of a corset to reduce the waist size and hip and buttock padding to increase the apparent size of the hips and buttocks. In an earlier attempt to quantify attractiveness, corset and girdle manufacturers of the 20th century used a calculation called hip spring[38] (or hip-spring or hipspring), calculated by subtracting the waist measurement from the hip measurement. However this calculation fell into disuse because it is a poor indicator of attractiveness; for example, a hip spring of 10 inches (250 mm) would likely be considered quite attractive for an average-sized adult woman, but a child or petite woman with the same number would more likely be seen as malnourished.

WHR versus BMI attractiveness is related to fertility, not fat content. A study performed by Holliday used computer generated female body shapes to construct images which covary with real female body mass (indexed with BMI) and not with body shape (indexed with WHR), and vice versa. Twelve observers (6 male and 6 female) rated these images for attractiveness during an fMRI study. The attractiveness ratings were correlated with changes in BMI and not WHR. The results demonstrated that in addition to activation in higher visual areas, changing BMI also adjusted of the brain reward system. This shows that BMI, not WHR, modulates reward mechanisms in the brain and that this may have important implications for judgements of ideal body size in eating disordered individuals.[39]

Another study, conducted by Furnham, was used as an extension of Singh & Young's (1995) investigation. A total of 137 participants participated in this study, all of whom were British. There were 98 female participants. The age range was between 16 and 67. The majority of participants were undergraduates, and 90% were white British, the remainder being Asian (East Indian) and African. Their educational and socio-economic backgrounds (nearly all middle class) were fairly homogenous, and none of the participants had previously participated in any studies involving female body shape or attractiveness. It was predicted that the effect of breast size on judgment of attractiveness and age estimation will be dependent on overall body fat and the size of the waist-to-hip ratio.[40]

All the participants were given a booklet with eight pictures in total. Each figure was identified as heavy or slender, feminine WHR or masculine WHR, and large breasted or small breasted. The participants rated the figures for four personal attributes (namely attractiveness, healthiness, feminine looking, and kindness/understanding).[40]

When ratings of the figures' attractiveness were being made, generally it appears that their bust size, WHR, and their weight were all important contributory elements. The female participants rated the figures with a low WHR as more attractive, healthy, feminine looking, and in the case of the heavy figure, more kind/understanding than did male participants. This is a particularly interesting finding, as most previous studies report that young women idealize female bodies solely on the basis of thinness. As far as the breast sizes of the slender figures is concerned, whether they had large or small breasts did not appear to have any effect on the ratings of attractiveness or kindness/understanding, and having larger breasts only increased the mean ratings of health and femininity very slightly. However, a heavy figure with a high WHR and a large bust was rated as the least attractive and healthy by all participants.[40]

Waist-Hip Ratio is also a reliable cue to one’s sex and it is hypothesized that the "individuals who represent a mismatch based on the cue provided by WHR (e.g., women with high WHRs or men with low WHRs) would likely be viewed as unattractive by the opposite sex." [41]

Food affecting the waist circumference

A number of studies have been carried out with focus on food composition of diets in relation to changes in waist circumference adjusted for body mass index.

Whole-grain ready-to-eat oat cereal diets, reduces low-density lipoprotein cholesterol and waist circumference in adults with overweight and obesity more than low-fiber control food diets.[42]

One study suggest that consuming a diet high in fruit, vegetables, reduced-fat dairy, and whole grains and low in red and processed meat, fast food, and soda was associated with smaller gains in BMI and waist circumference.[43]

A 2011 study suggest that dietary pattern high in fruit and dairy and low in white bread, processed meat, margarine, and soft drinks may help to prevent abdominal fat accumulation.[44]

See also

References

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  2. ^ "STEPwise approach to surveillance (STEPS)". World Health Organization. Retrieved March 21, 2012.
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  4. ^ In some places it is commonly accepted that a womans waist is measured one inch (2.5cm) above her navel and that a man is measured one inch below his navel. Waist To Hip Calculator at University of Maryland Medical System. Retrieved Dec 2010
  5. ^ http://whqlibdoc.who.int/publications/2011/9789241501491_eng.pdf
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  23. ^ Perfect waist-to-hip ratio is 0.7
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  27. ^ Marlowe, F. (2001). "Preferred waist-to-hip ratio and ecology" (PDF). Personality and Individual Differences. 30 (3): 481–489. doi:10.1016/S0191-8869(00)00039-8. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  28. ^ Dixson, B.J. (June 2007). "Human physique and sexual attractiveness: sexual preferences of men and women in Bakossiland, Cameroon". Arch Sex Behav. 36 (3): 369–75. doi:10.1007/s10508-006-9093-8. PMID 17136587. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
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  33. ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1016/0191-8869(94)90116-3, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1016/0191-8869(94)90116-3 instead.
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  35. ^ Dixson, B., Grimshaw, G., Linklater, W., & Dixson, A. (2011). Eye-Tracking of Men's Preferences for Waist-to-Hip Ratio and Breast Size of Women. Archives Of Sexual Behavior, 40(1), 43-50.
  36. ^ Pazhoohi, F., & Liddle, J. R. (2012). IDENTIFYING FEMININE AND MASCULINE RANGES FOR WAIST-TO-HIP RATIO. Journal Of Social, Evolutionary & Cultural Psychology, 6(2), 227-232.
  37. ^ Pazhoohi, F., Hosseinchari, M., and Doyle J. F. (2012). Iranian men’s waist-to-hip ratios, shoulder-to-hip ratios, body esteem and self-efficacy. Journal of Evolutionary Psychology. 10(2), 61–67.
  38. ^ [1]
  39. ^ Holliday, I. E., Longe, O. A., Thai, N., Hancock, P. B., & Tovée, M. J. (2011). BMI not WHR modulates BOLD fMRI responses in a sub-cortical reward network when participants judge the attractiveness of human female bodies. Plos ONE, 6(11), doi:10.1371/journal.pone.0027255
  40. ^ a b c Furnham, Adrian, Melanie Dias, and Alastair McClelland. "The Role of Body Weight, Waist-to-Hip Ratio, and Breast Size in Judgments of Female Attractiveness - Springer." Sex Roles 39.3-4 (n.d.): 311-26.
  41. ^ Pazhoohi F & Liddle J R (June 2012). "Identifying feminine and masculine ranges for Waist-to-Hip ratio". Journal of Social, Evolutionary, and Cultural Psychology. 6 (2): 227–232. doi:10.1037/h0099212.
  42. ^ http://www.ncbi.nlm.nih.gov/pubmed/20102847
  43. ^ http://www.ncbi.nlm.nih.gov/pubmed/12791618
  44. ^ http://www.ncbi.nlm.nih.gov/pubmed/21858094

External links

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