|Year : 2017 | Volume
| Issue : 2 | Page : 308-315
Occurrence of diabetes mellitus in obese nondiabetic patients, with correlative analysis of visceral fat, fasting insulin, and insulin resistance: A 3-year follow-up study (mysore visceral adiposity in diabetes follow-up study)
M Premanath1, H Basavanagowdappa2, M Mahesh3, M Suresh Babu3
1 Senior Consultant in Internal Medicine and Diabetes, JSS Medical College, JSS University, Mysuru, Karnataka, India
2 Professor of Medicine and Principal, JSS Medical College, JSS University, Mysuru, Karnataka, India
3 Professor of Medicine, JSS Medical College, JSS University, Mysuru, Karnataka, India
|Date of Web Publication||14-Mar-2017|
Prem Health Care, 671, Nrupatunga Road, M-Block, Kuvempunagar, Mysore, Karnataka
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Objective: To assess the occurrence of diabetes in obese nondiabetic patients over a 3-year follow-up period with a correlative analysis of visceral fat (VF), fasting insulin levels, (FILs) and insulin resistance (IR). Material and Methods: Thirty-seven obese and nineteen nonobese nondiabetics of our previous study, Mysore Visceral Adiposity in Diabetes were followed for the next 3 years. Their blood pressure, body mass index, waist circumference (WC), fasting blood sugar (FBS), FIL, lipid profile and subcutaneous fat (SCF), and VF measurement by US method were repeated every 6 months for the next 3 years. The findings were analyzed with appropriate statistical methods. Results: Twenty-three obese and 18 nonobese nondiabetics completed the study. There were 17 dropouts. The changes in the physical and biochemical characteristics of the two groups before and after the study were not significant. SCF had no correlation with IR whereas VF correlated with FIL and IR. There were three diabetics in the obese group and two from the control group at the end of the study. There were 12 impaired glucose tolerance (IGT) in the test group and 2 in the control group. Those who developed diabetes had higher VF, WC, FBS, FIL, and IR. Those who showed IGT also had these at higher levels compared to others. There was no change in the VF at the end of the study. Conclusions: This follow-up study on South Indians has shown that VF is a significant risk factor for the development of IR. IR can develop without any increase in the volume of the VF, is the essential finding of this study. SCF has not shown any significant relationship with IR. We recommend FBS and FIL in all the obese nondiabetics to calculate IR, which has given much insight in the development of IGT and diabetes. Large multicentric, longitudinal studies are required to establish the cause of IR.
Keywords: Diabetes, insulin resistance, visceral fat
|How to cite this article:|
Premanath M, Basavanagowdappa H, Mahesh M, Babu M S. Occurrence of diabetes mellitus in obese nondiabetic patients, with correlative analysis of visceral fat, fasting insulin, and insulin resistance: A 3-year follow-up study (mysore visceral adiposity in diabetes follow-up study). Indian J Endocr Metab 2017;21:308-15
|How to cite this URL:|
Premanath M, Basavanagowdappa H, Mahesh M, Babu M S. Occurrence of diabetes mellitus in obese nondiabetic patients, with correlative analysis of visceral fat, fasting insulin, and insulin resistance: A 3-year follow-up study (mysore visceral adiposity in diabetes follow-up study). Indian J Endocr Metab [serial online] 2017 [cited 2021 Jun 21];21:308-15. Available from: https://www.ijem.in/text.asp?2017/21/2/308/202039
| Introduction|| |
Obesity is at the background of severe metabolic abnormalities in India. Nearly 30%–65% of adult urban Indians are either overweight, obese, or have abdominal obesity. Abdominal obesity plays a major role in the pathogenesis of Type 2 diabetes, cardiovascular diseases, and hypertension., Central adiposity is more strongly associated with these problems than total adiposity.,,
Indian data suggest that standard cutoff points to define abdominal obesity, are not appropriate for Asian Indians  who are at risk of developing obesity-related comorbidities at a lower level of body mass index (BMI). They have waist circumference (WC), which is abnormal at any value of BMI. Despite the lack of clear explanation, there is a strong relationship between visceral fat (VF) and insulin resistance (IR), and this fact has been reported in a number of studies. Whether it is the mechanism of large free fatty acid (FFA) flux into the portal circulation by VF or the increased production of tumor necrosis factor-alpha and interleukin-6 and less secretion of adiponectin by abdominal fat, IR is the end result, thereby causing glucose intolerance. Even obese adolescents with a high proportion of VF and relatively low subcutaneous fat (SCF) have a phenotype, reminiscent of partial lipodystrophy. These adolescents may not be severely obese, yet they suffer from severe metabolic complications., It is also postulated that SCF behaves exactly opposite to VF. Most favorable metabolic profile was found with lowest VF and higher SCF. VF showed a strong association with Type-2 diabetes and SCF did not show such an association.
Mysore Visceral Adiposity in Diabetes (MYVAD) Study * showed that neither VF nor SCF had any correlation with IR. To ascertain whether changes in the VF and or SCF over a period of time would correlate with IR, this study in the obese, and nonobese nondiabetic patients of MYVAD study, was undertaken and were followed for the next 3 years.
| Methodology|| |
To assess the occurrence of diabetes in obese nondiabetic patients over a 3-year follow-up period with a correlative analysis of VF, fasting levels, and IR.
Participants in the age group of 18–65 years, whose BMI is >25 kg/m 2 for obese nondiabetics and whose BMI was <23 kg/m 2 for nonobese nondiabetics. (These were the criteria used for them in the previous study).
(1) Patients with type 2 diabetes mellitus (T2DM), (2) any acute illness, (3) pregnancy, (4) patients on antiobesity medications, (5) comorbid conditions such as chronic obstructive pulmonary disease, HIV, and tuberculosis, and (6) those who were overweight with a BMI values between 23-24.9 kg.m 2 (these were the exclusion criteria used for the participants in the previous study).
This was essentially the follow-up of the MYVAD study cohort that was carried out between March 2010 and April 2011. 37 obese and 19 nonobese nondiabetics from that study were followed for the next 3 years. Ethical approval was obtained from the Institutional Ethical Committee of JSS Medical College. Fresh informed consent was obtained from each individual who participated in this study. This study was started in September 2011 and completed in August 2014. The first follow-up was done exactly 6 months after the completion of MYVAD study. Each participant was clinically examined, for height (to the nearest cm) and weight (to the nearest 100 g). WC in centimeter was done in the standing position and was measured midway between lower border of the ribs and the iliac crest. Their sitting blood pressure (BP) was measured with a standard sphygmomanometer after 5 min of rest. Average of three readings was taken.
Their fasting blood sugar (FBS) (GOD-PAP method), HbA1C (high-performance liquid chromatography method), serum cholesterol (CHOD-PAP method), serum triglycerides (Enzymatic method), high-density lipoprotein (third-generation direct assay), low-density lipoprotein (third-generation direct assay), and serum insulin fasting assay (fasting insulin levels [FILs]) (CLIA method) values were obtained for each patient at a NABL accredited standard laboratory. IR was calculated by the homeostatic model assessment-IR assessment formula of FBS in millimoles multiplied by fasting insulin in mIU divided by 22.5. Clinical examination, laboratory measurements, and the sonographic assessment of abdominal fat were repeated every 6 months for the next 3 years. Cutoff values for BMI and WC for Asian Indians according to the IDF criteria have been followed in this study.
All measurements were made with GE P5 Logic system, using multifrequency (2-5 Mega HZ) convex probe for measurements of intra-abdominal fat thickness and a multifrequency (8–12 Mg Hz) linear probe for the measurements of abdominal wall fat.
Intra-abdominal fat (VF) thickness is defined as the distance between the anterior border of lumbar vertebra and posterior surface of rectus abdominis muscle. In is measured midway between xiphisternum and umbilicus, i.e. approximately 5 cm from umbilicus at three positions along the horizontal line, each measure were repeated 3 times [Figure 1]. All measurements were done at the end of quiet expiration, applying minimal pressure, not displacing or deforming the abdominal contents.
Abdominal wall fat index is the ratio of maximum preperitoneal to minimum SCF thickness. It is measured using a linear probe (8–12) placed at the epigastrium perpendicular to the skin. Longitudinal scans are obtained along the midline (linea alba) and fat skin barrier. The thickness of the SCF is defined as the distance between the anterior surface of the linea alba and the fat skin barrier [Figure 2]. The preperitoneal fat extends from the anterior surface of the left lobe of the liver to the posterior surface of the linea alba. The minimum SCF and maximum preperitoneal fat thickness are located at the epigastrium.
Abdominal fat measurement, which included the SCF, properitoneal fat (PPF), and VF were measured as per the protocol that was used in our previous study, by the same radiologist at each visit.
Those individuals either in the test sample or in the control sample who reached a HbA1C value of more than 6.5 were considered as diabetic, and their follow-up was stopped as they had reached the end point. Those individuals whose HbA1C was between >5.6 and but <6.4 were considered as having impaired glucose tolerance (IGT), and they were followed up until the end of the study. HbA1c was not repeated in those who had reached the end point as there was no provision.
The results of the six monthly follow-ups were entered it to the Excel sheets after each follow-up, both group-wise as well as individually.
The following statistical methods were used in this study: (1) descriptive statistics, (2) one-way ANOVA, (3) GLM repeated measures to define factors, and (4) Pearson's product moment correlation. All the statistical calculations were done through SPSS for windows (SPSS for Windows, Version 16, Chicago, SPSS Inc).
| Results|| |
The two groups that were taken from our previous study (MYVAD) for follow-up in this study were the obese and nonobese nondiabetics. The two groups had 37 participants at the end of MYVAD study. All the 37 participants of the obese group and 19 from the nonobese control group formed the subject material for the follow-up. There were a total of 14 dropouts in the obese group and one in the control group in the 3 years of follow-up. Eleven dropouts occurred in the first two follow-ups in the obese group and two in the fourth follow-up, whereas one each dropout occurred in the fifth follow-up. The data of the lost to follow-up cases were not considered for analysis. In the end, 23 from the obese group and 18 from the control group finished the study, and their data were taken for analysis [Figure 3].
Maximum participants in the obese group were in the age group of 30–50+ and <30–40 years in the control group [Table 1].
There were 11 males and 12 females in the obese group and 16 males and only 2 females in the control group [Table 2].
The various parameters that were taken for analysis both at the start of the follow-up and at the end of 3 years were weight, BMI, WC, BP (both systolic and diastolic), FBS, FILs, HbA1C, components of lipid profile, SCF, PPF, and VF. They have been depicted in [Table 3]. The significance between the groups, between the sexes, and between group and sex is also shown in the same table. As seen none of the parameters have shown any statistical significance at the end of the study.
|Table 3: Values of physical and biochemical parameters at the beginning and completion of the follow-up|
Click here to view
Pearson correlation coefficient method was used to correlate, SCF, VF, FIL, IR, and HbA1C with one another in both obese and control groups SCF had no correlation with any of the other parameters, whereas VF had a significant correlation with FIL (0.019) and IR (0.033). IR significantly correlated with FIL (0.000), HbA1C (0.000), and VF (0.033) in the obese group as shown in [Table 4].
In the control group, both SCF and VF had no correlation with FIL, HbA1C, and IR. Here, also IR correlated significantly with both FIL (0.000) and HbA1C (0.003) shown in [Table 5].
To have more information on those who developed IGT and diabetes, the total participants were divided into three groups; the five diabetics formed the first group, the 14 participants who showed HbA1C in the range of 5.6–6.4 (IGT) formed the second group, and the rest 22 formed the third group. In this analysis, it was clearly shown that those who showed diabetes had statistically significant higher values of FIL (0.000), HbA1C (0.000), IR (0.000), total cholesterol (0.007), and BMI (0.042). They also had higher values of VF but not statistically significant. Even those who had IGT showed higher values of FIL, HbA1C, and IR compared to the others group [Table 6].
[Table 7] shows the values of VF in the obese and control groups before the study and their values after a follow-up of 3 years. As can be seen, the VF has decreased in the obese group by 0.05 cm, and by 0.59 cm in the control group, both were not significant.
[Table 8] shows the risk of diabetes with IR, in the cohort of 41 cases to be 1.278 with 95% confidence interval (CI) from 1.030 to 1.585.
| Discussion|| |
Obesity is perhaps the longest studied and best-described risk factor for type 2 diabetes. Studies have shown that WC predicted T2DM. Two long-term big studies found that both overall and abdominal obesity strongly and independently predicted T2DM., Body surface measurements such as WC, do not distinguish between various adipose tissue depots. Hence, CT and MRI were used to differentiate SCF and VF and many studies documented that VF was more associated with IR and T2DM than SCF.,,,,
Debate is going on regarding which of these fat depots are more important in determining IR. One study found that both VF and SCF being independently and strongly related to IR. VF also increased the risk of development of IGT. A South Indian study showed that only VF and not SCF was associated with IR.
Most of the evidence on VF and SCF has emerged from analyses that have used cross-sectional designs, in which exposure variability of interest is measured at the same time as the outcome variability. Results from studies using such design have to be interpreted with caution since temporality of association cannot be determined. In contrast, longitudinal study designs, in which measurement of the exposure precedes the occurrence of the outcome is more desirable.
We found in our earlier MYVAD study, which had a cross-sectional design that BMI, WC, VF, and SCF had no correlation with IR. Even there, obese diabetics as well as nondiabetics had higher VF. Since it was a study limited for only 6 months, we thought a long-term follow-up of obese nondiabetics would throw some light on the changes in their abdominal fat as well as IR. Our primary goal was to find out whether any change in the abdominal fat, be it SCF or VF would have any influence in the causation of IR and diabetes after following them for 3 years. Obese males showed increase in their BMI, FBS, SCF, and HbA1C, whereas as decrease in their WC, VF, FIL, and IR but none were statistically significant. Obese females showed increase in their BMI, WC, FBS, IR, HbA1C, SCF, and VF and decrease in FIL, but again none were of any statistical significance [Table 3]. Since no conclusions could be drawn with these findings, correlation of VF and SCF was done with FIL, HbA1C, and IR in both the groups.
There is no consensus regarding the cutoff points of VF. Vlachos et al. opined that 7–9 cm for men and 7–8 cm for women nondiabetics would be the cutoff points. So also different studies mention different cutoff points for IR. The pioneering study Matthews et al. said that 1.35–1.96 would be the lower and upper limits of IR in nondiabetics. This study showed higher value of VF only in those who developed diabetes whereas higher IR values were seen not only in obese but also in nonobese nondiabetics.
FIL and HbA1C correlated significantly with IR (0.000), while SCF did not correlate with any of the parameters, VF correlated with IR (0.033) and FIL (0.019) in the obese group [Table 4]. In the control group, neither SCF nor VF correlated with FIL, IR, and HbA1C. These findings showed that VF has a probable role in the causation of IR in obese nondiabetics. This was a significant finding of this study.
When we divided the whole participants into DM group, IGT group, and others, the findings were really significant as DM group showed significantly higher values of FIL, IR, HbA1C, BMI, and TC. These values were also higher in the IGT group, but VF and SCF in spite of being highest in DM and higher in IGT group were not statistically significant. These significant changes were seen despite the fact that the VF of the obese group had little change over a period of 3 years (8.08 ± 2.08 vs. 8.03 ± 3.29), so also in the control group (5.86 ± 1.65 vs. 5.27 ± 2.66) [Table 7].
Have we been successful in our endeavor? Our primary objective was to find changes in VF and we found very little change over the years. We wanted to know whether it would influence the development of IR and diabetes. We have found three (13%) participants having HbA1C in the diabetic range and 12 (52%) in the IGT range out of the 23 followed in the obese group, despite no appreciable changes in the VF, which appears to us, highly significant. Increased VF was seen in the obese, who developed diabetes and was not seen in obese, who had IGT, but still a significant risk factor for the development of IR which culminates in IGT and DM. This has been the inference of many studies cited earlier. The importance of this study is that we have shown that an increase in VF over a period of time, is not necessary for the development of IR, as increased IR was seen not only in obese but also in the controls. As far as the reason for the causation of IR, it could be anything from FFA excess  to chronic inflammation in the VF, both of which could not be proved in our earlier studies.
We also found HbA1C in the range of diabetes in 2 (11%) and IGT in 2 (11%) in the controls despite having lower VF which defies explanation and needs further research. The risk for development of diabetes in this whole cohort with IR has been 1.278 with 95% CI 1.030–1.585 [Table 8].
We would like to propose the estimation of FBS and FIL in all obese nondiabetics in the beginning itself to know their IR which would give an idea of the probability of them going into diabetes and measures for prevention could be taken at that time itself. Routine measurement of VF may not throw much light in the beginning, even though it is an important risk factor for the development of DM.
Limitations of the study
The only limitation of this study was the small sample size to begin with, which dwindled further with dropouts. This may be the reason for the lack of statistical significance of many parameters despite them showing changes. A multicentric large, longitudinal study would probably answer many unanswered questions.
| Conclusions|| |
This follow-up study on South Indians has shown that VF is a significant risk factor for the development of IR. IR can develop without any increase in the volume of the VF, is the essential finding of this study. SCF has not shown any significant relationship with IR. We recommend FBS and FIL in all the obese nondiabetics to calculate IR, which has given much insight in the development of IGT and diabetes. Large multicentric, longitudinal studies are required to establish the cause of IR.
Our sincere thanks to Dr. M. Raghunath, Radiologist and Sonologist, for having measured the abdominal fat through US, throughout the study, Dr. Lancy D Souza, Associate Professor of Psychology, for statistical analysis, Association of Physicians of India, Karnataka chapter for providing research grant and encouraging us to conduct this study and to all the participants for cooperating with us for 3 years.
Financial support and sponsorship
The research grant for the entire 3 years of this follow-up study was provided by the Association of Physicians of India, Karnataka chapter, Bengaluru.
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6], [Table 7], [Table 8]
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