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ISSN: 2161-0509
Journal of Nutritional Disorders & Therapy

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Body Composition and Metabolic Risk Variables for Obesity in Korean Healthy Women

Kyurae Lee1*, Soojung Choi2, Sohyun Jun2, Kidong Ko2, Incheol Hwang2, Hanna Suh2 and Kyungkon Kim2

1Donginchoen Hospital, Gachon University, Incheon, Korea

2Gil Medical Center, Gachon University, Incheon, Korea

*Corresponding Author:
Kyurae Lee
Gachon University, Dongincheon Gil Hospital Incheon, Korea
Tel: 8210-4741-1509
Fax: 8232-764-9022
E-mail: [email protected]

Received date: July 23, 2015; Accepted date: August 20, 2015; Published date: August 25, 2015

Citation: Lee K, Choi S, Jun S, Ko K, Hwang I, et al. (2015) Body Composition and Metabolic Risk Variables for Obesity in Korean Healthy Women. J Nutr Disorders Ther 5:167.doi:10.4172/2161-0509.1000167

Copyright: © 2015 Lee K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

Objective: To investigate which indices to relate with metabolic risk among body composition.

Design and methods: As a cross sectional study, a total of 47 healthy Korean women aged 40.36 years, BMI 25.59 kg/m2, were assessed their BMI, percent of body fat (BIA), fat mass by DXA, adipose tissue (CT), fasting insulin, free fatty acid, cholesterol, triglyceride, HDL cholesterol, fasting plasma glucose, and HOMA IR index.

Results: Neither dyslipidemia nor hyperglycaemia has any relation with central fatness indicators & BMI. Fasting insulin is related with %BF* after correction for age. Dyslipidemia and hyperglycaemia tend to be greater in low insulin group. Among body composition, BMI, ** fat mass (DXA) **, %BF** except VAT, SAT, and V/S ratio of high insulin group are significantly higher than those of low insulin group. Although not significant, V/S ratio is likely to be higher in low insulin group. (*: p<0.05, **:p<0.01)

Conclusions: V/S ratio maybe a determinant to metabolic risks variables in healthy Korean women. Controlled lager cohort study would be considered in the future, to prove the association between SAT and metabolic derangement. In conclusion, %BF through BIA is considered as the major determinant to fasting insulin in Korean women.

Keywords

Superficial fat; Body composition; Obesity; Women; Adipose tissue

Introduction

The increase in global prevalence of obesity has required the more accurate evaluation, management and treatment as well as prevention of obese adult population. Obesity and its related diseases made a great contribution to the cardiovascular and metabolic mortalities. It has been generally accepted that the control of obesity is the major concern to establish the public health policy [1]. Hence the exact measurement of body fat is the important first footstep to assess, control and prevent the obesity epidemic [2].

While the human body is composed of fat and fat free compartments, body composition can be assessed through bioelectric impedance analysis [3], dual energy x-ray absorptiometry (DXA) [4], and CT [5]. Although the accurate measurement of body fat is the time consuming and expensive procedure, it is requisite to screen for fatness of community populations and set up for treatment modalities.

As anthropometrics is the most basic method for assessing body compositions, it is used for body mass, size, shape, and fatness for community [6]. The most established and well accepted measure for obesity is BMI (body mass index) which was introduced about 150 years ago by Quételet. It is calculated by dividing the body weight by the square of the height (given in kg/m2) [7]. Unfortunately it does not reveal the actual percentage of fat and might therefore overestimate adiposity in people with a high share of lean body mass (e.g. athletes) or underestimate it in people with less lean mass (e.g. elderly). In addition regarding cardiovascular mortality, there is no significant difference between normal-weight and overweight or obese subjects [8]. In spite of some limitation, BMI is the most widely used parameter for expressing the prevalence of obesity [9].

Underwater hydrostatic weighing, which is based on the different densities of AT (Adipose tissue) and lean tissue, is assumed to be the gold standard for determination of percent body fat [10]. Nevertheless, it is not applicable in clinical setting. Because underwater hydrostatic weighing is time consuming [11], labor intensive working and often hard to perform without mutual cooperation such as holding breathe underwater [12].

Body impedance analysis (BIA) is considered as the better practical method in medical office than the underwater hydrostatic weighing. Because the bio-electrical device has been made with regard to the electrical conductance theory, some confounding factors such as menstruation, pregnancy, water electrolyte imbalance might lead to an erroneous result.

DXA is a scanning technique that measures bone mineral, fat tissue, and fat-free soft tissue. Participants must lie completely still on the DEXA machine platform while X-rays at a high and low energy levels are passed over the body [13]. VAT (Visceral Adipose Tissue) carries a greater prediction of mortality than subcutaneous adipose tissue [14-16]. Quantification of VAT by DXA (Dual energy X-ray Absorptiometry) represents a precise and low-radiation alternative to computerized tomography [17].

In contrast CT scan uses an X-ray beam to produce cross sectional images of the body, allowing differentiation between measured muscles mass, visceral organ volumes [5], and measures of visceral adipose tissue in overweight and obese patients [6]. Single cross sectional images taken at specific abdominal locations can be used to assess total body adiposity, visceral adipose tissue as well as skeletal muscle mass in healthy adults and are a more cost effective option and reduce radiation exposure [18,19]. Although CT and magnetic resonance imaging (MRI) are currently the best methods for analysing regional adiposity, however, these machines are expensive [20] and are usually limited to the hospital setting [5].

Data from Asia, analyzed in preparation for the expert consultation, show that the relative risk of having at least one risk factor for cardiovascular disease is more prevalent at a low BMI. Nevertheless, progression in the prevalence of diabetes with high BMI and waist circumference is seen in all Asian populations. In addition epidemiologic data shows obesity in Asia has different ethnic characteristics to entangle with metabolic morbidity or its complication than cardiovascular mortalities [1].

Similarly, as Korea experienced earlier economic change than did most Asian countries, Korean with the lower cut-off value of BMI has the more metabolic complication [21]. There was a recent national comprehensive data using by body composition and anthropometrics as Korean National Health and Nutrition Examination Survey (KNHANES). According to the data, the appropriate cut-off points for obesity for women were as follows; BMI: 25 kg/m2, BIA: 30%, and VAT: 90 cm2 [22].

Different fatness markers such as VAT, V/S ratio, fat mass by DXA, %BF (BIA), and BMI could be applied for measurement of body composition for its specific purpose. While anthropometric method and impedance device are used in private practice setting, DXA and CT are applied in researcher area. The key to success of weight management is to detect the obesity and reduce the prevalence of its metabolic complication such as dyslipidemia, diabetes in advance.

The aim of this study is to explore which fatness indicator is the best index related to metabolic derangement in Korean women. Therefore we investigate the association between the metabolic variables (fasting plasma sugar, cholesterol, high density lipoprotein, triglyceride, fasting insulin, and free fatty acid) and the fatness indices for body composition (BMI, fat mass (DXA), %BF (BIA), V/S ratio, and VAT) in Korean female subjects.

Methods

Patient population and protocol

As this was an open cross-sectional study, all of them signed the informed consent form; the protocol of the study was approved by ethnics committee in Wallace Memorial Baptist Hospital. A total of forty seven non-smoking female subjects, aged 18.99-65.99 years, were included from a wide range, range of BMI (19.65- 40.29 kg/m2).

All participants were interviewed and screened by individual questionnaire, biochemical measurements, chest X-ray, and electrocardiography. Apparently healthy women beyond 18 kg/m2 were included. The exclusion criteria were the women with any major systemic diseases to change body composition within a month, which included congestive heart failure, impaired renal function, thyroid dysfunction, abnormal liver function, and malignancies. In addition those who had the fluctuation of weight more than 5% within 3 months were excluded.

The body compositions were assessed by using BIA, DXA and CT in a random order within an hour interval in the fasting phase at the same day.

Anthropometric measurements

All subjects were instructed to put on only standardized light clothes and remove all metal items, accessories and shoes. Anthropometric measurements were taken during clinical physical examinations. Standing height was measured to the nearest 0.1 cm by a wall-mounted standiometer. Weight was measured to the nearest 0.1 kg using digital scale.

Bioelectrical impedance analysis (BIA)

Percent body fat (%BF) was measured through multi-frequency bioelectric impedance analysis (X-scan, Jawon, Korea). All participants were instructed to remove their shoes and socks. Four electrodes were placed on the palm and thumb of both hands, and another four electrodes were placed on the anterior and posterior aspects of the soles of both feet. Alcohol was used to clean the skin on both hands and feet where electrode would be placed. The impedance measure is used to predict total body water (TBW) and fat-free mass (FFM) and fat mass is calculated from the difference between weight and FFM. Different tissues offer varying resistance, with adipose tissue a poor conductor of the current because of its low water content [23].

DXA measurements

A whole body DXA scan (GE Health Care, Lunar Corp., Madison, WI, USA) was performed for each subject to measure total and regional lean mass (kg), total body fat (kg), and total body fat percentage (%) using fan-beam technology. Additionally the fat mass of arm, trunk, and leg were measured for regional body fat composition assessment. Calibration was performed daily against the standard block to control the possible baseline drift. The measurement was performed in a medium scan mode with subject lying in a supine position, and the scanning time was about 20 minute. Total body imaging was analyzed using enCORE software. Daily quality control scans were acquired during the study period. No hard ware or software changes were made during the trial course.

CT measurements

CT scans were acquired using a General Electric CT scanner running Extended Brilliance Workspace software. A non-contrast enhanced standard abdominal scan was performed using 120 k-Vp, and 5-mm slice thickness. Subjects were placed in the supine position with arms above their head. Contiguous cross-sectional abdominal images were captured over 150 mm of the abdomen, beginning at the top of S1 and moving towards the head.

CT images were segmented using a semi-automated method to remove the subcutaneous adipose fat, and remaining tissue volumes were reconstructed from DICOM images using the GE Healthcare Advantage Workstation. A cross sectional scan of VAT (mm2) and SAT (subcutaneous adipose tissue) through computerized tomography was performed at umbilical level. V/S ratio as expressed percentile means the ratio of visceral fat to subcutaneous fat.

Metabolic risk variables

All measurements were conducted on the same day after fasting for at least 8 hours. Insulin, free fatty acid, and fasting cholesterol, triglyceride, high density lipoprotein cholesterol (HDL), and fasting plasma glucose were also measured during physical examination at the same day. The homeostasis model assessment (HOMA-index) was used as a measure of insulin resistance (fasting insulin (uU/mL) x fasting glucose (mmol/L)/22.5) [24].

Statistical methods

The SPSS package for windows version 12 (Chicago, USA) was applied for the statistical calculation. Pearson's correlation analysis was performed to assess the relationship between the metabolic risk variables and fatness indices (BMI, % BF (BIA), fat mass (DXA), VAT, and V/S ratio). Further assessment was performed to investigate the association after controlled age. Measurements were compared according to the significant fatness marker using student’s t-tests with critical value of P=0.05 used for assessing significant differences.

Result

Descriptive characteristic of participants

All characteristics of subjects are shown as mean +/- standard of error of means in (Table 1). The age of participants was 40.36 +/- 1.18 years; BMI was 25.59 +/- 0.40 kg/m2; % BF was 32.33 +/- 0.63 %; fat mass by DXA was 25.67 +/- 8.28 kg; VAT was 88.49 +/- 5.34 cm2; V/S Ratio was 40.46 +/- 2.49 (%). The subjects in the present study have lower VAT, higher BMI, and %BF (BIA) than those in Korean national data.

  Mean +/- S. E. M. Range
Age (years) 40.37 +/- 1.18 18.99 - 65.99
Height (cm) 160.36 +/- 0.55 147.20 - 170.30
Weight (kg) 65.86 +/- 1.05 50.30 - 98.30
BMI (kg/m2) 25.59 +/- 0.40 19.65 - 40.29
Percent of Body fat (%) 32.33 +/- 0.63 20.90 - 68.50
Fat mass by DXA (kg) 25.67 +/- 0.83 13.92 - 49.06
Truncal fat mass by DXA (kg) 14.49 +/- 0.49 5.91 - 28.99
VAT (cm2) 88.49 +/- 5.34 12.67 - 280.68
V/S Ratio (%) 40.46 +/- 2.49 3.40 - 132.19
Insulin (uU/mL) 9.83 +/- 0.99 2.75 - 39.34
Free Fatty acid (mmol/L) 715.26 +/- 33.89 172 - 1313
Cholesterol (nmol/L) 10.02 +/- 0.21 6.44 – 15.71
Fasting Plasma Glucose (nmol/L) 5.29 +/- 0.16 2.66 – 12.88
Triglyceride (nmol/L) 5.88 +/- 0.38 1.94 – 16.09
HDL Cholesterol (nmol/L) 3.25 +/- 0.10 2.05 – 7.38
HOMA Index 2.62 +/- 0.39 0.80 - 9.91

Table 1: Study showed for women and their VAT was expressed as 88.49 +/- 5.34 cm2.

Relation between metabolic variables and fatness markers

High density lipoprotein cholesterol has the negative association with VAT, V/S ratio ** (p=0.001), BMI (p=0.008), and fat mass * in trunk (p=0.033). Triglyceride has the positive association with BMI * (p=0.034), and the stronger with VAT, V/S ratio** (p=0.0001). In while fasting plasma glucose has stronger positive correlation with VAT** (p=0.001), V/S ratio** (p=0.004) as described in (Table 2).

  V/S Ratio % BF Fat mass by DXA Trunk Fat by DXA VAT BMI
Age .504** .211* .019 .144 .495** .173
Total Cholesterol .141/-.551 -.002/-.312 -.106/.078 -.054/.177 .029/-.306 -.22/-.128
Fasting Plasma Glucose .341**/.076 -.093/-.254 .133/.020 .214/.077 .377**/.028 .152/.028
Triglyceride .430**/.022 .129/-.187 .128/-.276 .250/-.276 .450**/-.200 .265*/-.200
HDL Cholesterol -.413**/-.463 -.174/-.028 -.227/.267 -.277*/.323 -.401**/-.124 -.323**/-.124
HOMA Index IR -.023/.234 .192/.499 .182/.444 .234/.454 .063/.454 .377/.454
Fasting Insulin -.183/.192 .303*/.596* .259/.491 .313/.424 .042/.424 .461**/.424
Free Fatty Acid .120/.199 .250/.341 .197/.530 .246/.483 .275/.483 .343*/.483

Table 2: Fasting plasma glucose has stronger positive correlation with VAT** (p=0.001), V/S ratio** (p=0.004).

Anthropometric and central fatness markers are closely positively related with triglyceride level, and inversely with high density lipoprotein level. In addition the central fatness indicators such as VAT, V/S ratio than BMI have more closely related with hypertriglyceridemia, low high density cholesterolemia, hyperglycemia. While central fatness markers are very closely related to metabolic risk variables, BMI is related to dyslipidemia, not hyperglycemia.

Fasting insulin level is positively related with %BF and BMI. In addition age was closely related to hypertriglycemia, hypercholesterolemia, low HDL cholesterolemia, hyperglycemia, VAT, V/S ratio and %BF.

We further investigated the relationship between metabolic variables and several other indices for obesity after correction for age. Neither dyslipidemia nor hyperglycemia has any relation with central fatness indicators as well as BMI after adjusting age factor. In contrast fasting insulin is related with %BF* after correction for age. (*: p<0.05, **: p<0.01)

Metabolic risk factors, body composition between two groups according to insulin level

After allocated to separate two subgroups based on insulin (9.8251 +/- 0.99 uU/ml), the metabolic risk factors and body composition were compared as mean +/- standard error of means. While triglyceride and fasting plasma glucose of high insulin group (fasting insulin >9.83 uU/ml) were shown as 4.68, 5.36 mmol/L, those of low insulin group (fasting insulin <9.83 uU/ml) were 7.44, 6.31 mmol/L respectively. HDL cholesterol of high insulin group was shown as 3.21 mmol/L, and that of low insulin group was compared as 3.09 mmol/L in (Table 3).

  Mean (S.E.M.) Fasting Insulin P Value
≥ 9.83 (N=17) < 9.83 (N=30)
Age (years) 40.37(1.18) 38.09 (2.92) 43.01(2.38) 0.209
Height (cm) 160.34(0.55) 161.33(1.27) 160.86(0.96) 0.769
Weight (kg) 65.86 (1.05) 75.08 (2.47) 66.19(1.68) 0.004
BMI (kg/m2) 25.59 (0.40) 28.83(0.86) 25.44 (0.59) 0.002
Percent of Body fat (%) 32.33(0.63) 35.58(0.95) 31.66 (0.76) 0.003
Fat mass by DXA (kg) 25.67(0.83) 33.08 (1.79) 25.51(1.25) 0.001
Truncal fat mass by DXA (kg) 14.49 (0.49) 18.35 (9.30) 14.66 (7.96) 0.005
Visceral Adipose Tissue (cm2) 88.49 (5.34) 99.67 (10.06) 99.24 (10.25) 0.978
Subcutaneous A.T. (cm2) 356.98 (45.70) 38.734(23.98) 33.031(21.03) 0.092
V/S Ratio (%) 40.46 (2.49) 36.01 (4.01) 45.60 (4.86) 0.182
Insulin (uU/mL) 9.83(0.99) 16.17 (1.89) 6.23(0.35) 0.000
Free Fatty acid (uEq/L) 715.26(33.89) 750.71(71.89) 694.48(33.98) 0.429
Total Cholesterol (mmol/L) 10.02 (0.21) 9.29(0.58) 9.70 (0.44) 0.573
Fasting Plasma Glucose (mmol/L) 5.29 (0.16) 5.36(0.23) 6.32(0.55) 0.184
Triglyceride (mmol/L) 5.88 (0.38) 4.69 (0.67) 7.44(1.09) 0.075
HDL Cholesterol (mmol/L) 3.25 (0.10) 3.21 (0.25) 3.09 (0.19) 0.721
HOMA Index 2.62 (0.39) 4.00 (0.74 ) 1.67(0.23) 0.002

Table 3: HDL cholesterol of high insulin group was shown as 3.21 mmol/L, and that of low insulin group was compared as 3.09 mmol/L.

Interestingly, hypertriglyceridemia, hyperglycemia, and low HDL cholesterolemia tend to be greater in low insulin group than high insulin group (Figure 1). In addition, HOMA index **of high insulin group is very significantly higher than that of low insulin group.

nutritional-disorders-therapy-Low-HDL-cholesterolemia

Figure 1: Hypertriglyceridemia, Hyperglycemia, and Low HDL cholesterolemia tend to be greater in low insulin group than high insulin group.

Among body composition, all parameters including BMI, ** fat mass (DXA) **, %BF** except VAT, SAT, and V/S ratio, of high insulin group are significantly higher than those of low insulin group. Although not significant, V/S ratio is likely to be higher in low insulin group (Figure 2). (*: p<0.05, **: p<0.01)

nutritional-disorders-therapy-low-insulin-group

Figure 2: V/S ratio is likely to be higher in low insulin group.

Discussion

Observed is the pattern of subjects as the standardized normal distribution, and their BMI and %BF are 25.69 +/- 0.40 kg/m2, 32.46 +/- 0.63%. The descriptive data of subjects reveals higher than those in the Asian or Korean data in %BF and BMI, but their results are consistent with the cut-off value for Asian or Korean obesity. The proportion of Asian people with risk factors for type 2 diabetes and cardiovascular disease is substantial even below the existing WHO BMI cut-off point of 25 kg/m2 [1].

Romero-Corral found that the diagnostic performance of BMI in intermediate ranges of body weight was limited mainly because of the inability of BMI to discriminate between %BF and lean mass [9]. Our results demonstrate that BMI has a relation with hypertriglycemia and low HDL cholesterolemia, not hyperglycemia. In addition Heymsfield suggested that short and tall subjects with equivalent BMIs had similar but identical body composition [25]. Previous studies [8,9] pointed that another better expressible index for fatness might exist than BMI.

In while Funahashi reported that the obese Japan women over 100 cm2 would be candidate for metabolic syndrome or cardiovascular mortalities, irrespective of their gender [26]. In contrast this study showed for women and their VAT was expressed as 88.49 +/- 5.34 cm2 as shown in Table 1. VAT of our study reveals lower than that of Funahashi study, but consistent to that of recent Korean data [22,27]. Mooney showed that adjusted ROC analysis for the whole group and stratified by race and gender, using clinical cut points for metabolic risks, revealed no consistently best predictor, though waist circumference and Waist-to-Height ratio predicted impaired fasting glucose better than BMI [28]. Park demonstrated that the correlations between ISI and age, WC, SBP, and body fat content were statistically significant, which suggests that WC and body fat content provide a better measure of visceral adiposity than does BMI in T2DM Koreans [29].

In addition clinical analyses of body fat distribution by CT scan revealed that glucose intolerance, plasma triglyceride level were closely related to the ratio of visceral fat area/abdominal fat area. Miwa reported Japanese middle aged women with a VFA of >100 cm2 and a BMI of >25 kg/m2 demonstrated a high prevalence of diabetes mellitus and impaired glucose tolerance [30].

Similarly, the present study shows that low HDL cholesterolemia, hypertriglyceridemia are more closely related with central fatness indicators (VAT and V/S ratio) than BMI, and trunk fat mass (DXA). However no significant association is found between metabolic risk factors and either central fatness indices or BMI after adjusted age.

Deurenberg suggested that the Chinese had a lower BMI for the same body fat (DXA) when BMI in those was corrected for body fat, taking age and gender into account [31]. Whereas fat mass (DXA) has no relation with dyslipidemia, but trunk fat mass (DXA) has a significant relation with low HDL cholesterolemia in the present study. However this association is disappeared after correction for age. DXA is precise measuring device, but has a limitation for expression for metabolic derangements. Therefore DXA is not considered as the better measure for replacing BMI in this study.

In while BIA as an easily affordable device had been developed for calculating body fat using by single or multi-frequency method since introduction. Segmental BIA (tetra- and eight-polar BIA) recognizes the human body is complex in shape and combines several impedance measures together for a more accurate assessment [32]. However, segmental-BIA has been found to significantly overestimate % BF in obese adults [33]. Senescence has led to change from muscular tissue to adipose tissue. C. H. Kim suggested that percent body fat gain with advancing age was due to a reduction of fat free mass rather than a gain in fat mass, especially in men [34].

Among body composition indices, %BF using by BIA has a significant positive association with fasting insulin (p=0.046). Furthermore the association is more pronounced after adjusting age (p=0.032). Percent of body fat measured through BIA is the significant determinant to fasting insulin in Korean women irrespective of age.

Dyslipidemia and hyperglycemia tend to be greater in low insulin group than high insulin group. Most of parameters except V/S ratio, VAT, and SAT of high insulin group are significantly higher than those of low insulin group in body composition. VAT, and SAT tend to be higher in high insulin group than low insulin group.

Although no significant difference, visceral to subcutaneous ratio has tendency to be higher in low insulin group than high insulin group. V/S ratio than VAT or SAT assumes to be more significant indicator for metabolic risk factors even in Korean obese women with hyperinsulinemia. Rie Oka suggested SAT was an independently associated with blood pressure in middle aged Japanese [35]. An epidemiologic cross sectional study showed that the prevalence of elevated triglycerides, reduced HDL, and elevated fasting glucose significantly decreased with increasing quintiles of SAT/VAT ratio [27,36,37]. Laaksonen suggested that the increase in subcutaneous abdominal fat water content is mediated by insulin sensitivity, and SAT nutritive flow improved insulin sensitivity could mediate the increase in abdominal subcutaneous fat hydration [38].

Korean individuals who were at risk to develop diabetes were not characterized by insulin deficiency, as defined by absolute insulin concentration or HOMA-β [39]. In similar no significant association exists between fasting plasma glucose and HOMA index in the present study. Matsumoto et al. reported that impairment of early-phase insulin secretion may be an important factor in the development of IGT, but total insulin secretion and insulin resistance are not associated with early progression of glucose intolerance in obese and non-obese Japanese subjects [40]. The insulin-secreting capacity of pancreatic β -cells in Japanese individuals might be smaller than in Caucasians.

Visceral to subcutaneous fat ratio maybe a determinant to metabolic risks variables in healthy Korean women. In order to prove the association between SAT and metabolic derangement, controlled lager cohort study would be considered in the future.

Study Limitation

This is the cross sectional, not the longitudinal cohort study and small subject to generalize. Larger controlled cohort study would be needed later. Secondly, subjects were recruited from visitors in the hospital setting, not a community. The participants in the present study were healthy subjects to bariatric clinic in the general hospital. Finally subjects were female only, not men. In addition some sociodemographic factors such as menopause, alcohol, genetic traits did not rule out for more accurate analysis.

Among body composition, anthropometric, BIA, DXA, and CT were assessed with metabolic risk variables for obesity in healthy Korean women. Our study shows there is a significant association between %BF and fasting insulin in Korean women. Furthermore, the association between two is more evident after controlled age. Therefore %BF through body impedance analysis is considered as the major determinant to fasting insulin in Korean women regardless of age.

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