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Association of Triglyceride/Glucose Index with CRP and Ferritin Among Different Obesity Phenotypes of Non-diabetic Adult Bangladeshi

Received: 23 August 2024     Accepted: 13 September 2024     Published: 26 September 2024
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Abstract

Introduction: Obesity is an alarming problem worldwide and it antedates insulin resistance (IR) as well as inflammation. Considering financial condition of Bangladesh, TyG index can be used for assessment of insulin resistance. As CRP and ferritin usually respond to any inflammatory condition, they are expected to be raised in obesity. Early detection of association between TyG index and inflammatory markers (CRP & ferritin) can help in prediction of severity of obesity induced health risks. Materials and Methods: A cross sectional analytical study was conducted in the Department of Biochemistry and Molecular Biology, (BSMMU) from March, 2022 to February, 2023. BMI was calculated, and individuals were classified into three obesity phenotypes: phenotype A (obese BMI, non-obese WC), phenotype B (non-obese BMI, obese WC), and phenotype C (obese BMI, obese WC). The Triglyceride-Glucose (TyG) index, serum ferritin, and CRP were assessed, and their correlations were analyzed across different obesity phenotypes. Results: TyG index was significantly higher in phenotype C compared to A & B. Plasma CRP and ferritin level were found to be highest in phenotype C in comparison to phenotype A and phenotype B. A moderate positive correlation was found between TyG index and serum ferritin but not with CRP in subjects belonging phenotype B. Very low positive correlation was found between CRP and ferritin in subjects of phenotype C. Conclusion: A significant association was shown between TyG index and serum ferritin among phenotype B. Plasma CRP showed no significant association with TyG index among different obesity phenotypes.

Published in Advances in Biochemistry (Volume 12, Issue 3)
DOI 10.11648/j.ab.20241203.14
Page(s) 112-117
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

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Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

TyG Index, Plasma CRP, Serum Ferritin, Obesity Phenotypes, Non-Diabetic Adult

1. Introduction
Obesity is a worldwide alarming issue for public health. It is assumed that 51 % of the total population will be obese by the year, 2030 . Obesity is a complex disease consisting of an excess or abnormal distribution or both of fat containing ad- ipose tissue which give rise to metabolic and endocrine al- terations and changes in the immune system and ultimately results in increased morbidity and lower life expectancy . Obesity antedates the insulin resistance (IR) and inflamma- tion which ultimately increases the risk of diabetes mellitus as well as various cardiovascular outcome .
The most used method for prediction of IR is homeostasis model assessment of insulin resistance (HOMA-IR). Measure- ment of fasting insulin is required to calculate HOMA-IR which is so expensive and not a routine test for obese individuals. Therefore many primary health care centers may not afford this . So considering financial condition, for developing countries, like Bangladesh, alternative tool for assessing IR is essential instead of HOMA-IR. The triglyceride/glucose index (TyG index), a formula formed by fasting triglyceride (TG) and glucose, can be used as an alternative tool to estimate IR instead of the HOMA-IR as triglyceride and blood glucose estimation are routinely done in our country. The cut off value for IR in the overall population is 8.8 for the TyG index . Use of TyG index reduces costs of screening with expanding its coverage.
In obese individuals ectopic fat deposition in different organs causes excess production of reactive oxygen species and pro-inflammation . C reactive protein (CRP) is the earliest markers for any inflammatory condition and the normal con- centration is less than or equal to 5 mg/L . Hepatic secretion of CRP increases in obesity due to certain inflammatory mecha- nism . Certain recent studies suggested that obesity induced chronic inflammatory reaction causes increased serum ferritin level which is not just because of an increased in iron stores . Normal ferritin level is usually 30 to 300 ng/ml are considered normal for men, and 10–200 ng/ml for women .
According to WHO criteria for Asia-Pacific region (WHO, 2000) individuals with BMI ≥25.0 kg/m2 are considered as gen- erally obese and WC ≥90 cm (men) and ≥80 cm (women) are considered as centrally obese. Several researchers showed that WC, coupled with BMI, predicts health risk better than BMI alone . Therefore in this study obesity phenotypes are classified based on both BMI and WC. This study aims to find out any association between inflammatory markers (CRP and Ferritin) and TyG index in different phenotypes of obesity which will help in early detection and prevention of obesity induced health risks.
2. Materials and Methods
A cross sectional analytical study was conducted in the De- partment of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujib Medical University (BSMMU) from March, 2022 to February, 2023 among 512 participants after getting approval from Institutional Review Board (IRB). Participants included for the study were nondiabetic, either sex (25-65 years) having BMI ≥18.5 kg/m2. Individuals who had chronic diseases, cardiovascular diseases, malignancy, history of taking lipid lowering drugs, NSAID, steroids and pregnant women were excluded from the study groups. Subjects (non-obese and obese individuals) from the outpatient department of BSMMU, who match the inclusion and exclusion criteria, were enrolled in the study by non-probability sampling technique. The participants were divided into non-obese (reference) and obese group on the basis of body mass index (BMI) and waist circumference (WC). Individuals with either obese BMI or obese WC or both were included into obese group. A written informed consent was taken from all who agreed to participate in the study.
After giving proper instruction fasting blood sample and an- other blood sample at 2 hours after 75 gm glucose were collected for estimation of fasting lipid profile, fasting plasma glucose, serum creatinine, plasma CRP, serum ferritin, SGPT and post load blood glucose. Obese individuals were classified into three phenotypes which were determined as phenotype A (obese BMI, non-obese WC), phenotype B (non-obese BMI, obese WC) and phenotype C (obese BMI, obese WC) considering BMI ≥25.0 kg/m2 as obese and waist circumference (WC) ≥90 cm as obese in men and ≥80 cm as obese in women. Then TyG index was calculated. Finally association between TyG index with CRP and ferritin was observed among different obesity phenotypes.
Data were cleaned, entered and analyzed by Statistical Package for the Social Sciences (SPSS) software version 26.0. Spearman rank correlation test was done. According to data as needed to achieve level of significance. P-value ≤ 0.05 was considered sta- tistically significant.
3. Results
Table 1. Distribution of subjects with respect to obesity.

Total subjects

Non-obese group (reference group)

Obese Group

Total Obese

Phenotype A

Phenotype B

Phenotype C

512

149

49

92

222

363 (71%)

Table 1 shows the distribution of subjects based on obesity, with 512 total subjects, 149 in the non-obese group, and 363 (71%) in the obese group. The obese group is further divided into three phenotypes: A (49 subjects), B (92 subjects), and C (222 subjects).
Figure 1. Distribution of subjects in respect of obesity.
Table 2. Mean±SD of Triglyceride glucose (TyG) index between different obesity phenotypes.

Parameter

Obesity Phenotypes (n = 363)

A (n = 49)

B (n = 92)

C (n = 222)

TyG

8.8 ± 0.4

8.9 ± 0.4

9.2 ± 0.6

Table 2 shows TyG index was elevated in phenotype C in comparison to phenotype A and phenotype B.
Table 3. Mean±SD of CRP between different obesity phenotypes.

Parameter

Obesity Phenotypes (n = 363)

A (n = 49)

B (n = 92)

C (n = 222)

CRP

2.64 ± 2.28

3.32 ± 3.47

6.41 ± 9.43

In Table 3 CRP was elevated in phenotype C in comparison to phenotype A and phenotype B.
Table 4. Mean±SD of ferritin between different obesity phenotypes.

Parameter

Obesity Phenotypes (n = 363)

A (n = 49)

B (n = 92)

C (n = 222)

Ferritin

85.78 ± 91.2

86.89 ± 84.8

149.63 ± 166.2

Table 4 found Ferritin was elevated in phenotype C in comparison to phenotype A and phenotype B.
Table 5. TyG index and inflammatory markers in obesity phenotype A.

Parameters

Correlation Coefficient

p-value

TyG index

CRP

-0.152

0.297

Ferritin

-0.015

0.916

CRP

Ferritin

-0.098

0.503

Spearman rank correlation was done
Table 5 shows, in obesity phenotype A, no significant correlation was found between TyG index and inflammatory markers.
Table 6. TyG index and inflammatory markers in obesity phenotype B.

Parameters

Correlation Coefficient

p-value

TyG index

CRP

-0.010

0.922

Ferritin

0.314

0.002

CRP

Ferritin

-0.087

0.409

Spearman rank correlation was done
Table 6 shows, in obesity phenotype B, a strong positive correlation was found between TyG index and serum ferritin. No significant correlation was found between TyG index and CRP.
Table 7. TyG index and inflammatory markers in obesity phenotype C.

Parameters

Correlation Coefficient

p-value

TyG index

CRP

-0.051

0.447

Ferritin

0.116

0.084

CRP

Ferritin

0.142

0.035

Spearman rank correlation was done
Table 7 shows, in obesity phenotype C, no significant correlation was found between TyG index and inflammatory markers. Very low positive correlation was found between CRP and ferritin.
4. Discussion
Obesity is one of the most challenging public health prob- lems of the 21st century . It has been identified as the fifth leading risk for global deaths . It is one of the major health issues in both developed and developing countries like Bangladesh. The World Health Organization (WHO) Expert Consultation on Obesity has already warned about the escalation of obesity prevalence in developing countries . Obesity is associated with many co morbidities like, diabetes, hypertension, respiratory diseases, cardiovascular diseases etc. All of these conditions ultimately leads to increased mortality and morbidity.
At present, body mass index (BMI) and waist circumfer- ence (WC) are widely used to define obesity. In our study, we classified different obesity phenotypes according to WHO (2000) criteria for Asia-Pacific region on the basis of BMI and WC . Different metabolic risks are associated with different obesity phenotypes. Certain phenotypes are at higher risk than other phenotypes because of variation in insulin sensitivity/ resistance and various inflammatory markers. This study aims to find out the association between TyG index (insulin resistance index) and inflammatory markers (CRP & ferritin).
With this purpose, 512 nondiabetic, normotensive and otherwise apparently healthy individuals were selected from outpatient department of BSMMU. We found, among 512 total study subjects 363 (71%) were obese possessing an obese BMI or an obese WC or both together. This indicates a very high proportion of obese individuals among our study subjects. This might be due to enrollment of subjects from hospital outpatient department (not from general population) where people with obesity related medical problems fre- quently attend.
Among all the obesity phenotypes in this study, TyG index was highest in phenotype C in comparison to phenotype A & B. Subcutaneous adipose tissue in contrast to visceral adipose tissue shows saturation of adipose tissue expansion. Beyond the saturation point, subcutaneous adipose tissue cannot ex- pand anymore and spillover fat for deposition in undesirable non adipose tissue ectopic sites (eg: liver, pancreas etc). This ectopic fat depots results in adverse metabolic profile and insulin resistance . Individuals in phenotype B associated with higher amount of visceral fat with little subcutaneous fat. Visceral fat increases lipolysis, increases hepatic gluconeo- genesis and glycogenolysis and increases pancreatic insulin secretion resulting in hyperglycemia and hepatic triglyceride production which increases TyG index in phenotype B. TyG index was highest phenotype C in comparison to other phe- notypes because of combined elevation of general and vis- ceral adiposity. In this study, among all the obesity phenotypes, individuals with phenotype C showed higher level of in- flammatory markers (CRP and ferritin). Plasma CRP and serum ferritin level were found to be highest in phenotype C, compared to phenotype A and phenotype B. In subjects of phenotype B, the accumulation of visceral adipose tissue is responsible for the up-regulation of low-grade chronic in- flammation and increases plasma CRP and ferritin . Ferritin and CRP found to be highest in phenotype C in comparison to other phenotypes because of combined effect of both general and abdominal obesity.
In our study, we observed that there was a moderate posi- tive correlation between TyG index and serum ferritin but not with CRP in subjects in phenotype B. It was due to high vis- ceral fat that increases lipolysis causing hypertriglyceremia as well as altered glucose metabolism and inducing ferritin to act as acute phase protein. Studies have shown that iron regulates the role of insulin in healthy people . Very low positive correlation was found between CRP and ferritin in subjects of phenotype C. This was due to obesity induced low grade inflammation which induces CRP and ferritin to act as acute phase proteins. Again, high ferritin levels without significant iron overload may alter glucose homeostasis, leading to insu- lin resistance and inflammatory changes resulting in elevated CRP levels . Yu et al., (2020) found that with the increase of the serum ferritin level, the CRP level increased obviously .
5. Limitations of the Study
The study was conducted in a single hospital with a rela- tively small sample size, which may limit the generalizability of the results to the broader community. Additionally, more accurate methods for measuring body fat, such as MRI or CT scans, were not used, preventing the differentiation of visceral fat from subcutaneous fat in categorizing obesity phenotypes.
6. Conclusion
Phenotype B was found to show significant association of TyG index with serum ferritin. No significant association was found between TyG index and CRP among phenotype A, phenotype B and phenotype C.
Abbreviations

BMI

Body Mass Index

TyG index

Triglyceride-Glucose Index

WC

Waist Circumference

CRP

C-reactive Protein

Acknowledgments
I would like to express my sincere gratitude for the inval- uable support and cooperation provided by the staff, partici- pants, and my co-authors/colleagues who contributed to this study.
Ethical Approval
The study was approved by the Institutional Ethics Com- mittee.
Author Contributions
Tanha Waheed Brishti: Conceptualization, Data curation, Formal Analysis, Funding acquisition, Investigation, Meth- odology, Project administration, Resources, Software, Su- pervision, Validation, Visualization, Writing – original draft, Writing – review & editing
Mozammel Hoque: Investigation, Methodology, Project administration, Software, Validation, Writing – review & editing
Mohammad Moyenullah : Project administration, Su- pervision
Azmeri Alam: Investigation, Project administration, Software, Supervision, Visualization
Funding
No funding sources.
Conflicts of Interest
The authors declare no conflicts of interest.
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Cite This Article
  • APA Style

    Brishti, T. W., Hoque, M., Moyenullah, M., Alam, A. (2024). Association of Triglyceride/Glucose Index with CRP and Ferritin Among Different Obesity Phenotypes of Non-diabetic Adult Bangladeshi. Advances in Biochemistry, 12(3), 112-117. https://doi.org/10.11648/j.ab.20241203.14

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    ACS Style

    Brishti, T. W.; Hoque, M.; Moyenullah, M.; Alam, A. Association of Triglyceride/Glucose Index with CRP and Ferritin Among Different Obesity Phenotypes of Non-diabetic Adult Bangladeshi. Adv. Biochem. 2024, 12(3), 112-117. doi: 10.11648/j.ab.20241203.14

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    AMA Style

    Brishti TW, Hoque M, Moyenullah M, Alam A. Association of Triglyceride/Glucose Index with CRP and Ferritin Among Different Obesity Phenotypes of Non-diabetic Adult Bangladeshi. Adv Biochem. 2024;12(3):112-117. doi: 10.11648/j.ab.20241203.14

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  • @article{10.11648/j.ab.20241203.14,
      author = {Tanha Waheed Brishti and Mozammel Hoque and Mohammad Moyenullah and Azmeri Alam},
      title = {Association of Triglyceride/Glucose Index with CRP and Ferritin Among Different Obesity Phenotypes of Non-diabetic Adult Bangladeshi
    },
      journal = {Advances in Biochemistry},
      volume = {12},
      number = {3},
      pages = {112-117},
      doi = {10.11648/j.ab.20241203.14},
      url = {https://doi.org/10.11648/j.ab.20241203.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ab.20241203.14},
      abstract = {Introduction: Obesity is an alarming problem worldwide and it antedates insulin resistance (IR) as well as inflammation. Considering financial condition of Bangladesh, TyG index can be used for assessment of insulin resistance. As CRP and ferritin usually respond to any inflammatory condition, they are expected to be raised in obesity. Early detection of association between TyG index and inflammatory markers (CRP & ferritin) can help in prediction of severity of obesity induced health risks. Materials and Methods: A cross sectional analytical study was conducted in the Department of Biochemistry and Molecular Biology, (BSMMU) from March, 2022 to February, 2023. BMI was calculated, and individuals were classified into three obesity phenotypes: phenotype A (obese BMI, non-obese WC), phenotype B (non-obese BMI, obese WC), and phenotype C (obese BMI, obese WC). The Triglyceride-Glucose (TyG) index, serum ferritin, and CRP were assessed, and their correlations were analyzed across different obesity phenotypes. Results: TyG index was significantly higher in phenotype C compared to A & B. Plasma CRP and ferritin level were found to be highest in phenotype C in comparison to phenotype A and phenotype B. A moderate positive correlation was found between TyG index and serum ferritin but not with CRP in subjects belonging phenotype B. Very low positive correlation was found between CRP and ferritin in subjects of phenotype C. Conclusion: A significant association was shown between TyG index and serum ferritin among phenotype B. Plasma CRP showed no significant association with TyG index among different obesity phenotypes.
    },
     year = {2024}
    }
    

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  • TY  - JOUR
    T1  - Association of Triglyceride/Glucose Index with CRP and Ferritin Among Different Obesity Phenotypes of Non-diabetic Adult Bangladeshi
    
    AU  - Tanha Waheed Brishti
    AU  - Mozammel Hoque
    AU  - Mohammad Moyenullah
    AU  - Azmeri Alam
    Y1  - 2024/09/26
    PY  - 2024
    N1  - https://doi.org/10.11648/j.ab.20241203.14
    DO  - 10.11648/j.ab.20241203.14
    T2  - Advances in Biochemistry
    JF  - Advances in Biochemistry
    JO  - Advances in Biochemistry
    SP  - 112
    EP  - 117
    PB  - Science Publishing Group
    SN  - 2329-0862
    UR  - https://doi.org/10.11648/j.ab.20241203.14
    AB  - Introduction: Obesity is an alarming problem worldwide and it antedates insulin resistance (IR) as well as inflammation. Considering financial condition of Bangladesh, TyG index can be used for assessment of insulin resistance. As CRP and ferritin usually respond to any inflammatory condition, they are expected to be raised in obesity. Early detection of association between TyG index and inflammatory markers (CRP & ferritin) can help in prediction of severity of obesity induced health risks. Materials and Methods: A cross sectional analytical study was conducted in the Department of Biochemistry and Molecular Biology, (BSMMU) from March, 2022 to February, 2023. BMI was calculated, and individuals were classified into three obesity phenotypes: phenotype A (obese BMI, non-obese WC), phenotype B (non-obese BMI, obese WC), and phenotype C (obese BMI, obese WC). The Triglyceride-Glucose (TyG) index, serum ferritin, and CRP were assessed, and their correlations were analyzed across different obesity phenotypes. Results: TyG index was significantly higher in phenotype C compared to A & B. Plasma CRP and ferritin level were found to be highest in phenotype C in comparison to phenotype A and phenotype B. A moderate positive correlation was found between TyG index and serum ferritin but not with CRP in subjects belonging phenotype B. Very low positive correlation was found between CRP and ferritin in subjects of phenotype C. Conclusion: A significant association was shown between TyG index and serum ferritin among phenotype B. Plasma CRP showed no significant association with TyG index among different obesity phenotypes.
    
    VL  - 12
    IS  - 3
    ER  - 

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Author Information
  • Department of Biochemistry, Green Life Medical College and Hospital, Dhaka, Bangladesh

    Research Fields: Tanha Waheed Brishti: Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh, Green Life Medical College & Hospital, Dhaka, Bangladesh

  • Department of Biochemistry, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh

    Research Fields: Mozammel Hoque: Bangabandhu Sheikh Mujib Medical Uni- versity, Dhaka, Bangladesh, Green Life Medical College & Hospi- tal, Dhaka, Bangladesh

  • Department of Burn and Plastic surgery, Dhaka Medical College Hospital, Dhaka, Bangladesh

    Research Fields: Mohammad Moyenullah: Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh, Green Life Medical College & Hospital, Dhaka, Bangladesh

  • Department of Biochemistry, Green Life Medical College and Hospital, Dhaka, Bangladesh

    Research Fields: Azmeri Alam: Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh, Green Life Medical College & Hospital, Dhaka, Bangladesh