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 ::  Abstract
 :: Introduction
 ::  Materials and Me...
 :: Results
 :: Discussion
 :: Acknowledgment
 ::  References
 ::  Article Figures
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  Table of Contents     
Year : 2011  |  Volume : 57  |  Issue : 3  |  Page : 184-188

Relationship of body fat with insulin resistance and cardiometabolic risk factors among normal glucose-tolerant subjects

Departments of Research Biochemistry, Epidemiology, Cell and Molecular Biology, Diabetology, Madras Diabetes Research Foundation & Dr. Mohan's Diabetes Specialities Centre, WHO Collaborating Centre for Noncommunicable Diseases Prevention and Control, IDF Centre for Education, Chennai, Tamil Nadu, India

Date of Submission19-Mar-2011
Date of Decision29-Apr-2011
Date of Acceptance26-May-2011
Date of Web Publication22-Sep-2011

Correspondence Address:
V Mohan
Departments of Research Biochemistry, Epidemiology, Cell and Molecular Biology, Diabetology, Madras Diabetes Research Foundation & Dr. Mohan's Diabetes Specialities Centre, WHO Collaborating Centre for Noncommunicable Diseases Prevention and Control, IDF Centre for Education, Chennai, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0022-3859.85200

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 :: Abstract 

Background : The amount of body fat, rather than the amount of excess weight, determines the health risks of obesity, type 2 diabetes mellitus, and cardiovascular disease. Aims : To look at the association of body fat percentage with cardiometabolic risk factors in subjects with normal glucose tolerance (NGT). Settings and Design : Cross-section study from the Chennai Urban Rural Epidemiology Study. Materials and Methods : Body fat was measured by Beurer body fat analyzer. Metabolic syndrome (MS) was diagnosed based on modified ATPIII guidelines. Statistical Analysis : Student's t test or one-way ANOVA (with Tukey's HSD) was used to compare groups for continuous variables. Results : Body mass index, waist circumference, systolic and diastolic blood pressure, HOMA IR, serum cholesterol, and LDL cholesterol increased significantly with increasing tertiles of body fat (P<0.001). There was a linear increase in the percentage of body fat with increase in number of components of MS (no metabolic abnormality: 25±11, one metabolic abnormality: 28±10, two metabolic abnormalities: 33±8, and three and more metabolic abnormalities: 35±7) (P<0.001). Regression models showed significant association of body fat with MS after adjusting for age, gender, insulin resistance, and glycated hemoglobin (Odds ratio: 1.04, 95% confidence interval: 1.04 - 1.08, P<0.001). In linear regression analysis, body fat showed a significant association with insulin resistance after adjusting for age, gender, and glycated hemoglobin (β=0.030, P<0.001). Conclusions : A significant association exists between body fat, MS, and cardiometabolic risk factors even among subjects with NGT.

Keywords: Asian Indians, body fat, cardiometabolic risk factors, insulin resistance

How to cite this article:
Gokulakrishnan K, Deepa M, Monickaraj F, Mohan V. Relationship of body fat with insulin resistance and cardiometabolic risk factors among normal glucose-tolerant subjects. J Postgrad Med 2011;57:184-8

How to cite this URL:
Gokulakrishnan K, Deepa M, Monickaraj F, Mohan V. Relationship of body fat with insulin resistance and cardiometabolic risk factors among normal glucose-tolerant subjects. J Postgrad Med [serial online] 2011 [cited 2023 Sep 23];57:184-8. Available from:

 :: Introduction Top

Obesity is a rapidly growing nutritional disorder characterized by excessive accumulation of adipose tissue. [1] Increased body weight is associated with insulin resistance and type 2 diabetes mellitus. Body fat content and distribution can be measured by hydrodensitometry, bioelectrical impedance, and dual-energy x-ray absorptiometry (DEXA). Gold standard techniques to determine BF%, such as hydrostatic weighing, deuterium dilution, and DEXA, are costly, time consuming, and not practical for field studies for examining body composition. Therefore, alternate methods of body composition assessment that are easier and safer to administer have been developed. One such technique is bioelectrical impedance analysis, which is a commonly used method for determining body composition, since it is noninvasive, simple, reliable, and inexpensive, using portable equipment. [2] An earlier study from our group showed that in urban south Indians, measurement of body fat by the leg-to-leg impedance method had fairly good agreement with DEXA. [3]

Insulin resistance, a consequence of abdominal obesity, is believed to be the key pathogenic factor in metabolic syndrome (MS). [4] Asian Indians are unique in that although their BMI is lower than Europeans, abdominal obesity and body fat percentage are higher. [5] To our knowledge, there are no data on the association of body fat percentage with cardiometabolic risk factors in Asian Indians. Hence, the present study was undertaken with the objective of determining the association of body fat percentage with cardiometabolic risk factors in Asian Indians with normal glucose tolerance (NGT).

 :: Materials and Methods Top

Study subjects were recruited from the Chennai Urban Rural Epidemiology Study (CURES), an ongoing epidemiological study conducted on a representative population (aged ≥ 20 years) of Chennai (formerly Madras), the fourth largest city in India. The methodology of the study has been published elsewhere. [6] Briefly, in Phase 1 of the urban component of CURES, 26 001 individuals were recruited based on a systematic random sampling technique, which is described in our website Fasting capillary blood glucose was determined using a One Touch Basic glucose meter (Life scan, Johnson and Johnson, Milpitas, California, USA) in all subjects. Subjects were classified as "known diabetic subjects" if they stated that they had diabetes and were on the treatment.

Phase 2 of CURES deals with studies of the prevalence of microvascular and macrovascular complications of diabetes among those identified with diabetes in Phase 1, wherein all the known diabetic subjects (n=1529) were invited to the center for detailed studies on vascular complications, and 1 382 responded (response rate, 90.3%). In Phase 3 of CURES, every tenth subject recruited in Phase 1 (n=2 600) was invited to our center for detailed anthropometric measurements and biochemical tests. Of these, 2 350 participated in the study (response rate: 90.4%). Those who were confirmed to have fasting plasma glucose (FPG) <5.5 mmol/l (100 mg/dl) or 2 hour post 75 g glucose value <7.8 mmol/l (140 mg/dl) based on WHO consulting group criteria [7] were labeled as "normal glucose tolerance." For the present study, a subset of subjects with NGT (n=1 185) were randomly selected from Phase 3 to participate in this study. Institutional ethical committee approval was obtained for the study and written informed consent was obtained from all study subjects.

A structured questionnaire was administered to the subjects to collect information on medical history and anthropometric measurements, which included height, weight, waist and hip circumferences, were taken using standard techniques as described in the definition section. [6] Blood samples were collected for estimating FPG and lipids. The samples were immediately transferred to the central laboratory where they were analyzed. Plasma glucose and serum lipids were estimated using a Hitachi 912 Auto analyzer (Mannheim, Germany) using kits supplied by Roche Diagnostics GmbH (Mannheim, Germany).

Serum insulin was estimated using enzyme-linked immunosorbent assay (Dako, Glostrup, Denmark). The intra-assay and the inter-assay coefficients of variation for insulin assay were 5.7% and 8.9%, respectively, and the lower detection limit was 0.5 mIU/ml.

Bioelectric impedance measurements were made using the Beurer body fat analyzer (Beurer BF 60, Ulm - Germany), which incorporates weighing scales and measures both weight and bioimpedance. Subjects were asked to stand barefoot on the metal sole plates of the machine. Age, gender, and height details were entered manually into the system. The bioelectrical impedance analysis method is based on the conduction of electrical current in the body and differences in electrical conductivity between the fat and water components of the body. Thus, electrical resistance and reactance together with body weight and height can reliably estimate body composition. Impedance measurements allow assessment of the fat-free mass and by difference with body weight, assessment of body fat percentage. Body weight and percentage body fat, estimated using the standard built-in prediction equation for the given age group, were displayed on the machine. The reproducibility of the body fat measurement was assessed by repeating the measurements on 50 patients on the same day [3] and the kappa statistics was 0.86 indicating good reproducibility.

Height was measured with a tape to the nearest 0.1 cm. Subjects were requested to stand upright without shoes with their back against the wall, heels together, and eyes directed forward. Weight was measured with a spring balance that was kept on a firm horizontal surface. Subjects wore light clothing, stood upright without shoes, and weight was recorded to the nearest 0.5 kg. Body mass index (BMI) was calculated as body weight in kilogram divided by the height in meter (kg/m2). Waist circumference was measured using a nonstretchable fiber measuring tape. The subjects were asked to stand erect in a relaxed position with both feet together on a flat surface. Waist girth was measured as the smallest horizontal girth between the costal margins and the iliac crests. Two measurements were made and the mean of the two was taken as the waist circumference. Blood pressure was recorded in the sitting position in the right arm to the nearest 2 mmHg using the mercury sphygmomanometer (Diamond Deluxe BP apparatus, Pune, India). Two readings were taken 5 minutes apart and the mean of the two was taken as blood pressure.

Hypertension was diagnosed based on medical history, drug treatment for hypertension, and/or if the subjects had systolic blood pressure (SBP) ≥130 mmHg or greater and/or diastolic blood pressure (DBP) ≥85 mmHg. [8] MS was diagnosed using the IDF criteria. [9] If an individual had abdominal obesity plus two or more risk factors of the following criteria, he/she was diagnosed to have MS; waist circumference ≥90 cm in men and ≥80 cm in women; FPG ≥100 mg/dl; blood pressure ≥130/85 mm/Hg; Triglycerides ≥150 mg/dl; and serum HDL cholesterol <40 mg/ dl in men and <50 mg/dl in women. Insulin resistance was calculated using the homeostasis assessment model (HOMA-IR) using the formula: Fasting insulin (lIU/ml) fasting glucose (mmol/l)/22.5.

Student's t test or one-way ANOVA (with Tukey's HSD) as appropriate was used to compare groups for continuous variables and Chi-square test was used to compare proportions. Study subjects were categorized into tertiles of percentage of body fat; unequal numbers were found in the tertiles, due to decimals. Pearson's correlation analysis was carried out to determine the correlation of body fat with cardiometabolic risk factors. Logistic regression analysis was carried out using MS as the dependent variable and other risk factors as independent variables. All analyses were done using Windows-based SPSS statistical package (Version 10.0, Chicago) and P values <0.05 were taken as significant.

 :: Results Top

The clinical and biochemical characteristics of the study subjects stratified according to tertiles of percentage of body fat are shown in [Table 1]. Age, BMI, waist circumference, SBP and DBP, HOMA IR, FPG, glycated hemoglobin, serum cholesterol, LDL cholesterol, and HDL cholesterol increased significantly with increasing tertiles of body fat (P for trend <0.001 for all) and log serum triglycerides (P<0.001).
Table 1: Clinical characteristics of study subjects in tertiles of percentage of body fat

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Body fat percentages in subjects with and without varying metabolic abnormalities are presented in [Table 2]. Percentage of body fat was significantly higher in subjects with elevated fasting glucose (P=0.009), hypertension (P<0.001), hypertriglyceridemia (P=0.003), low HDL cholesterol (P<0.001), and MS (P<0.001) compared with their counterparts without the respective metabolic abnormalities.
Table 2: Mean percentage of body fat in subjects with and without various metabolic abnormalities

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There was a linear increase in the percentage of body fat with increase in number of components of MS (no metabolic abnormality: 25±11, one metabolic abnormality: 28±10, two metabolic abnormalities: 33±8, and three and more metabolic abnormalities: 35±7) (P for trend<0.001) [Figure 1].
Figure 1: Mean body fat percentage in relation to number of metabolic abnormalities. *P<0.01, **P<0.001 compared with no abnormality. ^P for trend<0.001

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Logistic regression analysis done using MS as dependant variable showed that body fat had a significant association with MS (Odds ratio [OR]: 1.07, 95% confidence interval (CI): 1.05 - 1.09, P<0.001]. This association remained statistically significant even after adjustment for age and gender, insulin resistance, and glycated hemoglobin (OR: 1.04, 95% CI: 1.04 - 1.08, P<0.001) [Table 3]. Multiple linear regression analysis was done to determine the association of body fat with insulin resistance. Body fat showed a significant association with insulin resistance (b=0.029, P<0.001), even after adjusting for age, gender, and glycated hemoglobin (b=0.030, P<0.001).
Table 3: Logistic regression analysis-dependent variable: Metabolic syndrome

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 :: Discussion Top

The main findings of the study are that in south Indians, a significant association exists between body fat and MS and cardiovascular risk factors even among subjects with NGT.

Several cross-sectional epidemiological studies suggest that obesity and abdominal obesity are strongly linked to diabetes. [10],[11] Indeed, obesity is considered to be the link between insulin resistance and metabolic abnormalities, which includes diabetes, hypertension, and dyslipidemia, all of which are risk factors for coronary artery disease. [4] Fat storages in adipose tissue have been shown to be linked to insulin resistance and diabetes. Though studies have shown both total fat and visceral fat to be associated with diabetes, visceral fat is considered to be more important as it has been shown to have a strong correlation with glucose intolerance and insulin resistance. [12],[13] In this context, this study yielded interesting information with regard to insulin resistance. It was observed that body fat percentage increased in NGT subjects with increased insulin resistance as measured by HOMA IR compared with those without increased insulin resistance, and body fat percentage is independently associated with insulin resistance.

Earlier studies [14],[15] on Asian Indians have reported an association of waist circumference with diabetes, suggesting that increased accumulation of fat in the abdominal cavity may be one of the contributors to diabetes in this ethnic group. Waist circumference showed a strong correlation with visceral and central abdominal fat in both diabetic and nondiabetic subjects. [16] In the present study, body fat percentage showed a correlation both with waist circumference and BMI. Glucose intolerance and other metabolic abnormalities may cluster together, resulting in increased risk for coronary artery disease. [4] We have observed that subjects with MS had higher levels of body fat percentage compared with subjects without MS. It was also observed that body fat percentage increased with increase in number of metabolic abnormalities indicating a dose-response relationship between body fat percentage and metabolic abnormalities.

Accumulation of body fat, particularly in the abdominal region, has several health implications, including cardiovascular health risk. [17],[18] Previous studies have reported a positive association of both BMI [19] and waist-to-hip ratio [20] with hsCRP concentrations. Total white blood cell count has been found to be significantly associated with BMI, percentage body fat, and insulin concentrations. [21] In our earlier study, we have shown that the association of body fat with diabetes is mediated through inflammation. [22] Evidence for the link between obesity and diabetes comes from the epidemiological and intervention studies, with weight reduction as the main target. The Diabetes Prevention Programme demonstrated that a 7% reduction in body weight by exercise and diet could prevent diabetes in subjects with impaired glucose tolerance by as much as 58%. [23] A study on Japanese women suggested that reducing the intra-abdominal fat to 60 cm 2 was beneficial in reducing cardiovascular risk factors. [24]

It is well established that coronary artery disease can be prevented by interventions like lifestyle modification, use of statins, fibrate, or antihypertensive therapy. [25],[26] Hence, it is imperative to identify subjects with cardiovascular risk at the earliest. Screening for body fat percentage as an indicator of increased cardiovascular risk would be extremely useful for large epidemiological studies, especially in a developing country like India. In this context, the body fat percentage appears to be of great significance as it identifies individuals with higher cardiovascular risk since it is noninvasive, simple, reliable, and inexpensive, using portable equipment for determining body composition. Thus, bioimpedance analysis systems are increasingly being used to quantify body composition in both clinical and research settings, as they are cheaper and more readily available compared with the gold standard, i.e., measurement of body composition using DEXA. [3],[27] Thus, for practical and scientific reason, bioimpedance are often one of the most suitable options for clinical assessment of fatness.

One of the limitations of the study is that being a cross-sectional design, we are unable to demonstrate a cause and effect relation between body fat percentage and cardiometabolic risk factors. However, the strength of the study is that it is a large population-based sample in Asian Indians who have a high prevalence of premature coronary artery disease and diabetes and is one of the first in this ethnic group.

In conclusion, this study reports that among Asian Indians, a significant association exists between body fat percentage, insulin resistance, and cardiometabolic risk factors.

 :: Acknowledgment Top

We acknowledge the Chennai Willingdon Corporate Foundation, Chennai, India, for their support for the CURES field studies, which led to this publication. This is the 115 th publication from CURES (CURES-115).

 :: References Top

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2.Bioelectrical impedance analysis in body composition measurement. NIH Technol Assess Statement 1994:1-35.  Back to cited text no. 2
3.Vasudev S, Mohan A, Mohan D, Farooq S, Raj D, Mohan V. Validation of body fat measurement by skinfolds and two bioelectric impedance methods with DEXA--the Chennai Urban Rural Epidemiology Study [CURES-3]. J Assoc Physicians India 2004;52:877-81.  Back to cited text no. 3
4.Reaven GM. A syndrome of resistance to insulin stimulated uptake (Syndrome X). Definitions and implications. Cardiovasc Risk Factors 1993;3:2-11.  Back to cited text no. 4
5.Joshi R. Metabolic syndrome-emerging clusters of the Indian phenotype. J Assoc Physicians India 2003;51:445-6.  Back to cited text no. 5
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7.Alberti KG, Zimmet PZ. Definition, diagnosis and classification of diabetes mellitus and its complications. Part 1: Diagnosis and classification of diabetes mellitus, provisional report of a WHO Consultation. Diabet Med 1998;15:539-53.  Back to cited text no. 7
8.Grundy SM, Cleeman JI, Merz CN, Brewer HB Jr, Clark LT, Hunninghake DB, et al. Implications of recent clinical trials for the National Cholesterol Education Program Adult Treatment Panel III guidelines. Circulation 2004;110:227-39.  Back to cited text no. 8
9.The Asia Pacific perspective: Redefining obesity and its treatment. Regional Office for the Western Pacific of the World Health Organization. World Health Organization, International Association for the Study of Obesity and International Obesity Task Force. Sydney: Health Communications Australia Pty Limited; 2000. p. 17-21.  Back to cited text no. 9
10.Haman F, Fontaine-Bisson B, Batal M, Imbeault P, Blais JM, Robidoux MA. Obesity and type 2 diabetes in Northern Canada's remote First Nations communities: The dietary dilemma. Int J Obes (Lond) 2010;34:S24-31.  Back to cited text no. 10
11.He Y, Zhai F, Ma G, Feskens EJ, Zhang J, Fu P, et al. Abdominal obesity and the prevalence of diabetes and intermediate hyperglycaemia in Chinese adults. Public Health Nutr 2009;12:1078-84.  Back to cited text no. 11
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14.McKeigue PM, Shah B, Marmot MG. Relation of central obesity and insulin resistance with high diabetes prevalence and cardiovascular risk in South Asians. Lancet 1991;337:382-6.  Back to cited text no. 14
15.Ramachandran A, Snehalatha C, Viswanathan V, Viswanathan M, Haffner SM. Risk of noninsulin dependent diabetes mellitus conferred by obesity and central adiposity in different ethnic groups: A comparative analysis between Asian Indians, Mexican Americans and Whites. Diabetes Res Clin Pract 1997;36:121-5.  Back to cited text no. 15
16.Pouliot MC, Despres JP, Lemieux S, Moorjani S, Bouchard C, Tremblay A, et al. Waist circumference and abdominal sagittal diameter: Best simple anthropometric indexes of abdominal visceral adipose tissue accumulation and related cardiovascular risk in men and women. Am J Cardiol 1994;73:460-8.  Back to cited text no. 16
17.Fox CS, Massaro JM, Hoffmann U, Pou KM, Maurovich-Horvat P, Liu CY, et al. Abdominal visceral and subcutaneous adipose tissue compartments: Association with metabolic risk factors in the Framingham Heart Study. Circulation 2007;116: 39-48.  Back to cited text no. 17
18.Chiba Y, Saitoh S, Takagi S, Ohnishi H, Katoh N, Ohata J, et al. Relationship between visceral fat and cardiovascular disease risk factors: The Tanno and Sobetsu study. Hypertens Res 2007;30:229-36.  Back to cited text no. 18
19.Chambers JC, Eda S, Bassett P, Karim Y, Thompson SG, Gallimore JR, et al. C-reactive protein, insulin resistance, central obesity, and coronary heart disease risk in Indian Asians from the United Kingdom compared with European whites. Circulation 2001;104:145-50.  Back to cited text no. 19
20.Lin CC, Kardia SL, Li CI, Liu CS, Lai MM, Lin WY, et al. The relationship of high sensitivity C-reactive protein to percent body fat mass, body mass index, waist-to-hip ratio, and waist circumference in a Taiwanese population. BMC Public Health 2010;10:579.  Back to cited text no. 20
21.Vozarova B, Weyer C, Lindsay RS, Pratley RE, Bogardus C, Tataranni PA. High white blood cell count is associated with a worsening of insulin sensitivity and predicts the development of type 2 diabetes. Diabetes 2002;51:455-61.  Back to cited text no. 21
22.Mohan V, Deepa R, Velmurugan K, Premalatha G. Association of C-reactive protein with body fat, diabetes and coronary artery disease in Asian Indians: The Chennai Urban Rural Epidemiology Study (CURES-6). Diabet Med 2005;22:863-70.  Back to cited text no. 22
23.Knowler WC, Barrett-Connor E, Fowler SE, Hamman RF, Lachin JM, Walker EA, et al. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med 2002;346:393-403.  Back to cited text no. 23
24.Tanaka K, Okura T, Shigematsu R, Nakata Y, Lee DJ, Wee SW, et al. Target value of intraabdominal fat area for improving coronary heart disease risk factors. Obes Res 2004;12:695-703.  Back to cited text no. 24
25.Tonstad S, Sundfor T, Seljeflot I. Effect of lifestyle changes on atherogenic lipids and endothelial cell adhesion molecules in young adults with familial premature coronary heart disease. Am J Cardiol 2005;95:1187-91.  Back to cited text no. 25
26.Tenenbaum A, Motro M, Fisman EZ, Tanne D, Boyko V, Behar S. Bezafibrate for the secondary prevention of myocardial infarction in patients with metabolic syndrome. Arch Intern Med 2005;165:1154-60.  Back to cited text no. 26
27.Horlick M, Arpadi SM, Bethel J, Wang J, Moye J, Cuff P, et al. Bioelectrical impedance analysis models for prediction of total body water and fat-free mass in healthy and HIV-infected children and adolescents. Am J Clin Nutr 2002;76:991-9.  Back to cited text no. 27


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  [Table 1], [Table 2], [Table 3]

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