
Metabolic Syndrome
From Mechanisms to Interventions
- 1st Edition - November 10, 2023
- Imprint: Academic Press
- Editors: Satinath Mukhopadhyay, Sunetra Mondal
- Language: English
- Paperback ISBN:9 7 8 - 0 - 3 2 3 - 8 5 7 3 2 - 1
- eBook ISBN:9 7 8 - 0 - 3 2 3 - 8 5 6 5 8 - 4
Metabolic Syndrome: From Mechanisms to Interventions covers all aspects of this complex and multifactorial disease, providing a cutting-edge understanding of the problem of MetS,… Read more

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Request a sales quoteMetabolic Syndrome: From Mechanisms to Interventions covers all aspects of this complex and multifactorial disease, providing a cutting-edge understanding of the problem of MetS, with a particular focus on its prevention and clinical management. The book discusses practical implementable approaches to its reversal in clinical practice, encompassing the entire spectrum of MetS, from molecular understanding to clinical therapeutics and prevention. This book is a valuable resource for clinicians in multiple specialties, including endocrinologists, diabetologists, hepatologists, gynecologists and researchers in related fields who need a deep understanding of the full range of scientific and clinical aspects of metabolic syndrome.
- Presents a holistic, preventative strategy involving each and every aspect of metabolic syndrome, from pathophysiologic to clinical management
- Discusses recent research on the role of inflammation, adipokines and myokines in metabolic syndrome
- Includes cutting-edge information on the impact of bariatric surgery and role of gut microbiota in MetS
- Provides flowcharts and diagrams to simplify pathophysiologic aspects and their association between risk factors
Clinicians and researchers focused on endocrinology, cardiology, vascular disease, other health care workers in related fields, Health professionals and researchers working with hepatology, gynecology, bariatric surgeries, and epidemiology
- Cover image
- Title page
- Table of Contents
- Copyright
- Dedication
- Contributors
- Foreword
- Chapter 1. Metabolic syndrome—A glance through the sands of time
- Early days—Ripples on the surface
- Middle age—Obesity takes center stage
- The birth of metabolic syndrome—Putting it all together
- Syndrome X and beyond
- Modern times: Confusion to consensus
- Chapter 2. Beyond the metabolic syndrome: Adverse influences of insulin resistance on the aging process
- Prolog
- Metabolic syndrome background
- Important criteria for diagnosing metabolic syndrome
- Historic events behind the concept of insulin resistance
- The battle between dietary sugars and fat
- Along came Yudkin
- The metabolic syndrome in people without diabetes
- Correlating FBG (IR) and age to various components of MS in non-diabetics during periods of Continuum of Risks and Aging Paradox
- Importance of the ageing paradox in comprehending the role of IR in influencing life cycle and appreciating use of potential preventive measures to extend longevity
- Sum up: Benefits of caloric restriction on IR strengthens the proposed hypothesis
- Chapter 3. Intrauterine malnutrition and future risk of metabolic syndrome
- Metabolic syndrome—Introduction
- Intrauterine origins of metabolic syndrome—Global evidence
- Mechanistic aspects
- Early origins of metabolic syndrome—The Indian perspective
- Evidence from Indian cohort studies
- Interventions to address intra-uterine malnutrition
- Conclusions
- Chapter 4. Intervening at the stage of metabolic syndrome to prevent type 2 diabetes—Is it justified?
- What is MetS?
- Progression of MetS to T2DM
- Concept of T2DM remission/reversal
- Concept of prevention
- Role of lifestyle modifications
- Reversal by physical exercise
- Reversal by diet
- Reversal by low calorie diet (LCD)
- Reversal by low cardohydrate diet (LC)
- Reversal by pharmacological interventions
- Reversal by bariatric surgery
- Conclusion
- Chapter 5. Dietary fats and their effects on metabolic syndrome and its components
- Introduction
- Metabolic syndrome and cardiovascular risk factors
- Dietary fats and metabolic syndrome
- Effects of long-chain fatty acids on metabolic syndrome
- Effects of medium-chain fatty acids on metabolic syndrome
- Diacylglycerols and phospholipids and their effects on metabolic syndrome
- Effects of dietary fats on endothelium function
- Conclusions
- Chapter 6. Epidemiology of metabolic syndrome: global scenario
- Introduction
- Metabolic syndrome risk factors
- Global prevalence of MetS
- MetS in Africa
- MetS in the Americas
- MetS prevalence in Asia
- MetS prevalence in Brazil
- MetS prevalence in Europe
- MetS in the Middle East
- MetS in indigenous, native people and underserved populations
- Final considerations
- Chapter 7. Epidemiology of metabolic syndrome in South and South-East Asia
- Introduction
- Prevalence of metabolic syndrome in India
- Prevalence of metabolic syndrome in Pakistan
- Prevalence of metabolic syndrome in Bangladesh
- Prevalence of metabolic syndrome in Sri Lanka
- Prevalence of metabolic syndrome in Nepal
- Prevalence of metabolic syndrome in Singapore
- Prevalence of metabolic syndrome in Malaysia
- Prevalence of metabolic syndrome in Indonesia
- Prevalence of metabolic syndrome in Philippines
- Prevalence of metabolic syndrome in Vietnam
- Prevalence of metabolic syndrome in Thailand
- Conclusion
- Chapter 8. Barker hypothesis and metabolic syndrome
- Introduction
- Barker hypothesis
- Low birth weight cohorts across the globe
- Proposed mechanisms behind Barker hypothesis and its impact on low birth weight
- Barker hypothesis and diabetes mellitus
- Barker hypothesis and cardiovascular risk
- Clinical consequences
- Conclusion
- Chapter 9. Understanding the complexities of metabolic syndrome in First Nations Australians
- Introduction
- Metabolic syndrome: definitions and limitations
- Prevalence of obesity and metabolic syndrome in First Nations Australians
- Prevalence of diabetes mellitus in First Nations Australians
- Cardiovascular disease and metabolic syndrome in First Nations Australians
- Impact of chronic kidney disease and metabolic syndrome in First Nations Australians
- Metabolic-associated fatty liver disease in First Nations Australians
- The burden of polycystic ovarian syndrome in First Nations Australians
- Management challenges
- Conclusion
- Take home points
- Chapter 10. Nutrition in the pathogenesis of metabolic syndrome: Roles of sugar, salt and fat
- Metabolic syndrome: An introduction
- Effects of dietary components on metabolic syndrome
- Mechanistic insight into insulin resistance
- Inflammatory response associated with MetS
- Role of lipid in diets
- Effect of dietary sugar
- Effect of dietary salt
- Management of MetS
- Novel nutraceutical-based formulations
- Conclusion
- Chapter 11. Vitamin D deficiency and metabolic syndrome—Is there a causality?
- Introduction
- Metabolic syndrome
- Vitamin D and metabolic syndrome
- Vitamin D and obesity
- Association between vitamin D deficiency and hypertension
- Vitamin D and insulin resistance
- Vitamin D and dyslipidemia
- Vitamin D and cardiovascular risk
- Vitamin D and PCOS
- Vitamin D and NASH
- Effects of vitamin D supplementation
- Interventional studies in children
- Conclusion
- Chapter 12. Role of inflammation in the pathogenesis of metabolic syndrome
- Introduction
- Inflammation
- Activation of inflammatory pathways
- Pathophysiology of metabolic syndrome
- Role of inflammation in obesity
- Role of inflammation in insulin resistance
- Role of inflammation in dyslipidemia
- Role of inflammation in hypertension
- TB and diabetes
- Conclusion
- Chapter 13. Role of oxidative stress in the pathogenesis of metabolic syndrome
- Introduction
- Oxidative stress
- Oxidative stress in metabolic syndrome
- Oxidative stress in diabetes
- Oxidative stress in hypertension
- Oxidative stress and dyslipidemia
- Circulating oxidative stress markers in metabolic syndrome
- Therapeutic aspects of targeting oxidative stress in metabolic syndrome
- Conclusion
- Chapter 14. Mitochondrial dysfunction and metabolic syndrome
- Epidemiology of metabolic syndrome
- Pathophysiology of metabolic syndrome
- Mitochondria—the powerhouse of the cell
- Mitochondria as a source of reactive oxygen species (ROS)
- Overnutrition and physical inactivity: a major driving force for ROS production in mitochondria
- Mitochondrial redox signaling in metabolic syndrome
- ROS-induced insulin resistance
- Mitochondrial function and insulin resistance
- Regulation of mitochondrial biogenesis and metabolic syndrome
- Leptin resistance associated with mitochondrial dysfunction
- Leptin resistance
- Leptin resistance and mitochondrial dysfunction
- Studies to show the role of mediators linking leptin resistance and mitochondrial dysfunction
- Conclusion
- Chapter 15. The entero-insular axis and metabolic syndrome
- Introduction
- Historical perspective
- The “entero-insular” axis and “incretin” concept
- The neural component of the “entero-insular” axis
- The “incretin” candidates
- Glucose-dependent insulinotropic polypeptide (GIP)
- Glucagon-like peptide 1 (GLP-1)
- Incretins and metabolic syndrome
- Incretin, bariatric surgery, and glycemic control
- Therapeutic implications of the incretin effect on metabolic syndrome
- Future directions
- Chapter 16. Type I interferons in metabolic syndrome
- Introduction
- Type 1 interferons
- Type 1 interferons and atherosclerosis
- Type 1 interferons and type 2 diabetes mellitus
- Type 1 interferon in non-alcoholic fatty liver disease
- Conclusion
- Chapter 17. Role of circadian rhythms in metabolic syndrome
- Introduction
- Circadian orchestra—coupling between the master and peripheral clocks
- Circadian rhythms in metabolic pathways
- Circadian disruption and metabolic syndrome
- Conclusive remarks
- Chapter 18. The role of genetic and epigenetic factors in familial clustering of metabolic syndrome
- Introduction
- Role of genetics in familial aggregation and heritability of metabolic syndrome
- Identification of specific genes predisposing to MetS
- Epigenetics
- Conclusion and future perspective
- Chapter 19. Endocrine disruptors in the pathogenesis of metabolic syndrome
- Introduction
- Overview of endocrine disruptors
- Endocrine disruptors—routes and sources of exposure
- Endocrine disruptors and potential pathways of metabolic disruption
- Endocrine disruptors and obesity
- Endocrine disruptors and glucose intolerance
- Endocrine disruptors and dyslipidemia
- Endocrine disruptors and hypertension
- Conclusions
- Chapter 20. Atherosclerotic cardiovascular disease in metabolic syndrome
- Introduction
- Definition of metabolic syndrome
- Prevalence data on MetS
- Cardiovascular risk association of single components of MetS
- Role of insulin resistance and visceral adipose tissue in cardiovascular risk
- Metabolic syndrome and cardiovascular risk
- Metabolic syndrome as a tool for cardiovascular risk
- Hemodynamic effects of the components of MetS
- Conclusion
- Chapter 21. Atherosclerosis is the outcome of adaptive complexity in the Arterial Endothelial Microenvironment
- Introduction
- Chapter 22. NAFLD, the hepatic manifestation of the metabolic syndrome
- Introduction
- Progress in NAFLD assessment
- Diagnostic tools
- NAFLD epidemiology and relation with metabolic syndrome
- Pathogenesis of NAFLD and the role of insulin resistance
- NAFLD outcome
- NAFLD and risk of comorbidities
- Treatment of MetS-associated features in patients with NAFLD
- Conclusion
- Chapter 23. Obesity associated hypogonadism—a growing concern in metabolic syndrome
- Introduction
- Metabolic syndrome, visceral adiposity, and hypogonadism—The common pathway
- Role of SHBG
- Role of adipocytokines and estrogen
- Role of inflammatory markers
- When to test for hypogonadism in men with metabolic syndrome?
- Biochemical evaluation of hypogonadism in obesity and MS—Basic facts
- Diagnosis of hypogonadism in MS
- Role of lifestyle management in treatment of obesity-induced hypogonadism
- Role of testosterone replacement therapy
- Role of testosterone replacement in preventing the evolution of T2D from prediabetic state and reversal of metabolic syndrome—Evidence from larger RCTs
- Testosterone therapy … route of choice?
- Monitoring of benefits/side effects of testosterone treatment: When to stop
- Conclusion
- Chapter 24. Sleep apnea—A cause or a consequence of metabolic syndrome?
- Introduction
- Etiology of obstructive sleep apnea
- Arguments in favor of metabolic syndrome causing obstructive sleep apnea (obesity/weight-dependent mechanisms)
- Physiology-dependent (weight independent) mechanisms leading to OSA
- Arguments in favor of OSA causing metabolic syndrome
- Bidirectional relationship between OSA and components of the metabolic syndrome—Glycemic control
- Bidirectional relationship between OSA and components of the metabolic syndrome—Insulin resistance
- Bidirectional relationship between OSA and components of the metabolic syndrome—Leptin
- Tissue-specific effects of chronic intermittent hypoxia—Adipose tissue
- Tissue-specific effects of chronic intermittent hypoxia—Liver
- Tissue-specific effects of chronic intermittent hypoxia—Muscle
- Tissue-specific effects of chronic intermittent hypoxia—Gut microbiota
- Conclusion and future directions
- Chapter 25. Renal manifestations of metabolic syndrome: the link between obesity and chronic kidney disease
- Why is obesity in CKD important? Epidemiology
- Obesity in CKD: cause or consequence
- Metabolically healthy obesity
- Clinical and histological phenotype of obesity-associated CKD
- Molecular mechanisms of obesity-related CKD
- What is the best measurement for obesity in CKD?
- Obesity in early and advanced CKD—a paradox
- Obesity in transplant recipients
- Does reversing obesity reduce the risk for obesity-associated nephropathy?
- Conclusion
- Chapter 26. Metabolic syndrome and periodontitis: pathophysiologic links and clinical implications
- Introduction
- Periodontitis and MetS: a bidirectional association
- Pathophysiological links
- Clinical implications
- Conclusions
- Chapter 27. Insulin resistance and risk of osteoporosis
- Introduction
- Evidence available from animal studies
- Evidence available from human studies
- Conclusions
- Chapter 28. Glucagon and the metabolic syndrome
- Case
- Introduction to glucagon
- Glucagon production
- Glucagon secretion
- The glucagon receptor
- Glucagon and the pathogenesis of type 2 diabetes
- Glucagon receptor antagonists
- Pharmacologic therapies for type 2 diabetes and effects on glucagon
- Bariatric surgery
- Glucagon raises resting energy expenditure
- Glucagon increases satiety
- Oxyntomodulin
- Glucagon improves dyslipidemia
- Glucagon and hepatic steatosis
- Clinically relevant extremes in glucagon in humans
- Glucagon's role in upcoming obesity therapies
- Conclusion
- Chapter 29. Assessment of insulin resistance: From the bench to bedside
- Introduction
- Defining insulin resistance
- Molecular mechanisms underlying insulin resistance
- Estimating insulin resistance: From bench to bedside
- Measures of insulin resistance (Table 29.1)
- Utilizing OGTT to derive hepatic and peripheral insulin sensitivity
- Surrogate markers for insulin resistance
- Uses of insulin resistance in common diseases
- Summary
- Chapter 30. Role of exercise in the prevention and treatment of metabolic syndrome
- Introduction
- Twenty-four-hour energy expenditure
- Physical activity, exercise, and metabolic syndrome
- Exercise and metabolic syndrome
- Exercise and blood pressure
- Exercise and adipose tissue
- Exercise and lipid metabolism
- Exercise and glucose metabolism
- Chapter 31. Pharmacologic therapies in metabolic syndrome with special reference to non-alcoholic fatty liver disease
- Epidemiology of NAFLD and metabolic syndrome
- Chapter 32. Role of newer anti-diabetes drugs in prediabetes: A systematic review
- Introduction
- Methods
- Results
- Discussion
- Chapter 33. Management of insulin resistance in PCOS
- Introduction and epidemiology
- Diagnosis of PCOS
- Pathophysiology
- Investigations
- Insulin resistance in PCOS
- Assessment of insulin resistance
- Association of insulin resistance and PCOS
- Management of insulin resistance in PCOS
- Conclusion
- Chapter 34. The role of bariatric surgery in the management of metabolic syndrome
- Introduction
- Indications of bariatric surgery
- Preoperative management
- Mechanisms by which bariatric procedures help in management of metabolic syndrome
- Adjustable gastric band
- Sleeve gastrectomy (SG)
- Roux–en–Y gastric bypass (RYGB)
- Endoscopic bariatric therapies
- Indications of EBT
- Contraindications of EBT
- Conclusion
- Chapter 35. Anti-inflammatory interventions to mitigate the cardiovascular risk in metabolic syndrome
- Myocardial dysfunction due to diabetes mellitus
- Hypertension in metabolic syndrome
- Role of atherosclerosis in the progression of MetS
- MetS and thrombosis
- MetS and stroke
- Chapter 36. Management of new onset dysglycemia in transplant recipients
- Introduction
- Pathophysiology
- Outcomes
- Management of new onset dysglycemia
- Immunosuppression modification
- Pharmacological management
- Reviews, guidelines, and expert reports for treatment of new onset dysglycemia
- Conclusion
- Chapter 37. Management of lipid abnormalities in metabolic syndrome
- Introduction
- Pathogenesis
- Management
- Other avenues of management of dyslipidemia in metabolic syndrome
- Conclusion
- Chapter 38. Overview of metabolic syndrome in children and adolescents—an Indian perspective
- Introduction
- Burden of disease
- Definition
- Risk factors
- Assessment
- Future research
- Conclusions
- Key points
- Chapter 39. Metabolic syndrome in children and adolescent: South Asian perspective
- Introduction
- Definition and its controversies and prevalence
- Risk factors
- South Asian phenotype and its significance
- Is the SA phenotype evident in childhood?
- Various theories are postulated for this ethnic difference/pathophysiology
- Screening
- Comorbidities
- Treatment
- Conclusion
- Chapter 40. Inter-relationship between polycystic ovary syndrome and metabolic syndrome
- Introduction
- Prevalence of MS in women with PCOS
- Characteristics of metabolic syndrome in PCOS
- Pathogenesis of metabolic syndrome in PCOS
- Consequences of PCOS with MS
- Management of the metabolic syndrome in PCOS
- Conclusion
- Chapter 41. Metabolic syndrome—definition
- History
- Purpose of definition
- Components of the definition
- Metabolic syndrome in childhood
- Does everything fit?
- Do we really need it?
- Conclusion
- Chapter 42. Metabolic syndrome and cancer risk
- Introduction
- Conclusion
- Chapter 43. Obesity-mediated insulin resistance in target tissues: role of adiponectin, fetuin-A, and irisin
- Introduction
- Obesity-mediated insulin resistance in target tissues
- The key players—adipokines, hepatokines, and myokines
- Adiponectin—a potent insulin sensitizing adipokine
- Fetuin-A—a hepato-adipokine with proinflammatory attributes
- Irisin—a thermogenic adipo-myokine that is induced by exercise
- Inter-organ crosstalk mediated by adiponectin, fetuin-A, and irisin
- Future perspective—potential biomarkers of insulin resistance and MetS
- Abbreviations
- Chapter 44. Gut microbiota and metabolic syndrome: What's new?
- Background
- Nutrition and the gut microbiome
- Gut microbiota targeted therapies in MetS
- Naturopathic medicine
- Conclusions
- Chapter 45. Metabolic syndrome and COVID-19: An unholy alliance
- Metabolic syndrome and risk of COVID-19
- Pathogenic mechanisms
- Therapeutic implications
- Preventive implications
- Metabolic health in the COVID and post-COVID era
- Chapter 46. MicroRNA modulation in metabolic syndrome: A novel insight into cardiometabolic diseases
- Introduction
- miRNA biogenesis and nomenclature
- miRNA in the endothelium and atherosclerosis
- Cardiometabolic syndrome: Endothelial miRNAs, type 2 diabetes (T2D)
- miRNA-transcription factor interaction in cardiometabolic diseases
- Therapeutic potential
- Conclusion
- Chapter 47. Role of artificial intelligence in tackling the metabolic syndrome pandemic
- Introduction
- Diagnostic criteria for MetS
- The challenges of tackling the metabolic syndrome pandemic
- Lifestyle
- Non-alcoholic fatty liver disease
- Type 2 diabetes mellitus and cardiovascular disease
- Gut microbiota
- Insulin resistance
- Computational biology and medicines perspective
- Artificial intelligence
- Application of AI in the biomedical field
- Several common machine learning methods
- Decision tree
- Random Forest
- Artificial neural network
- Artificial intelligence versus traditional methods
- Conclusion
- Chapter 48. Glucose handling by the brain and its implication in metabolic syndrome
- Introduction
- Role of brain in glucose homeostasis
- Pathophysiological basis of role of brain in diseases of glucose homeostasis
- Therapeutic implications
- Conclusion
- Chapter 49. Hypoglycemia, insulin resistance, and cardiovascular disease: A possible link
- Introduction
- Definition and epidemiology of hypoglycemia
- Hypoglycemia and cardiovascular risk
- Mechanistic links between hypoglycemia and cardiovascular risk
- Hypoglycemia, insulin resistance, and the metabolic syndrome: Possible cardiovascular risk
- Conclusions and future directions
- Chapter 50. Dietary interventions to combat obesity in metabolic syndrome - Role of time restricted eating
- Introduction
- Circadian rhythm, feeding timeframe, and metabolic health
- Time restricted eating—A potential pragmatic approach to obesity management
- TRE and other health benefits
- Is TRE feasible/sustainable?
- Conclusion
- Chapter 51. Systemic inflammation in psoriasis: Sequel of metabolic syndrome
- Introduction
- Endothelial cell dysfunction and inflammation: Role in atherosclerosis
- Toll-like receptors, cell trafficking, inflammation, cardiovascular disease, and diabetes mellitus
- CRP: C-reactive protein
- Lp-PLA2 (Lipoprotein-Associated Phospholipase A2)
- Psoriasis, psoriatic arthritis, systemic inflammation, and risk of ASCVD
- Adipocytokines in obesity, insulin resistance, and in the inflammatory cascades of psoriatic disease
- Medical interventions and clinical outcomes
- Future directions
- Chapter 52. Abdominal obesity and adipose tissue depots: Focus on intra-abdominal versus subcutaneous adipose tissue depots in Asian Indians
- Background
- Prevalence of abdominal obesity in the South Asia and in India
- Various measures of abdominal obesity
- Body composition and “the Reference Man”
- Visceral and subcutaneous adipose tissue compartments
- Implications of abdominal obesity on metabolic parameters and CVD in Asian Indians
- Intra-abdominal visceral adipose tissue (IAAT) versus subcutaneous abdominal adipose tissue (SCAT) and its implications on health
- Differences in body fat and adipose tissue compartments between South Asians versus Caucasians
- Conclusion
- Chapter 53. The immediate and long-term metabolic implications of maternal obesity and gestational weight gain
- Introduction
- Pathophysiology and outcomes of maternal obesity and GWG
- Effects of pre-pregnancy BMI on offspring weight—what is the evidence?
- Effect of excess GWG on the mother and the fetus
- Recommendations for GWG
- IOM recommendations for GWG—can it be applied universally
- GWG—important aspects in monitoring and interventions
- Conclusion
- Chapter 54. Managing the metabolic syndrome in a general practice setting in the UK (by a general practitioner practising among a high risk South Asian population)
- Index
- Edition: 1
- Published: November 10, 2023
- No. of pages (Paperback): 700
- No. of pages (eBook): 500
- Imprint: Academic Press
- Language: English
- Paperback ISBN: 9780323857321
- eBook ISBN: 9780323856584
SM
Satinath Mukhopadhyay
Dr Mukhopadhyay has been involved in patient care, teaching and research for more than two decades. In addition to teaching MD students for their postdoc (DM) degree in Endocrinology & Metabolic disorders, he also guides research fellows and postdocs for their translational work involving metabolic syndrome (MetS). He has been working on the role of the hepatokine fetuin-A on metabolic syndrome. He is also working on a peroxyvanadate compound that prevents the progression of MetS to T2DM by inhibiting Fetuin-A. His group was credited with the first randomized controlled trial (RCT) on the impact of vitamin D treatment on IR and progression of people with MetS to T2D, discodering a role of vitamin D in the prevention of progression of MetS.
Affiliations and expertise
Full Professor, Department of Endocrinology, Institute of Postgraduate Medical Education and Research, Calcutta, IndiaSM
Sunetra Mondal
Dr. Sunetra Mondal obtained her Doctorate of Medicine degree in the subject of Endocrinology and Metabolism in the year 2019 and MD in Medicine in the year 2016. She is currently a postdoctoral senior resident in the Dept of Endocrinology, Institute of Postgraduate Medical Education & Research and has been working on the largest cohort of Turner Syndrome in India, doing research on their genetics and phenotypic aspects including their metabolic parameters and body composition parameters.
Affiliations and expertise
Postdoctoral senior resident, Department of Endocrinology, Institute of Postgraduate Medical Education and Research, Calcutta, IndiaRead Metabolic Syndrome on ScienceDirect