ORIGINAL RESEARCH article
Sec. Pediatric Gastroenterology, Hepatology and Nutrition
Volume 7 - 2019 | https://doi.org/10.3389/fped.2019.00241
Early Inflammatory Status Related to Pediatric Obesity
- 1Department of Pediatrics, University of Medicine, Pharmacy, Sciences, and Technology, Târgu Mureş, Romania
- 2Department of Medical Informatics and Biostatistics, University of Medicine, Pharmacy, Sciences and Technology, Târgu Mureş, Romania
- 3Department of Pediatric Cardiology, University of Medicine, Pharmacy, Sciences and Technology, Târgu Mureş, Romania
Background: Obese individuals are often in a chronic inflammatory condition due to the malfunction of immune-related activities in the adipose tissue, involving a transient infiltration of neutrophils within the abdominal fat and their binding to adipocytes. Neutrophil to lymphocyte ratio (NLR) and platelet to lymphocyte ratio (PLR) are considered cost-effective markers for the detection of subclinical inflammation. Our study intends to assess the early stages of inflammation associated with overweight and obesity in children.
Materials and Methods: We performed a prospective study with 164 children, aged between 5 and 18 years, admitted to a Pediatric Tertiary Hospital in Romania between January 2018 and January 2019. The patients were divided according to body mass index (BMI) into two groups: Group 1: 77 overweight and obese children (BMI percentile ≥85), and Group 2: 87 children with a normal BMI, in order to evaluate the correlation between BMI and laboratory parameters (CBC, ESR, transaminase, total protein, albumin, and blood glucose levels), inflammatory biomarkers, NLR and PLR, and changes in abdominal ultrasound findings.
Results: We found that the leukocyte, lymphocyte, erythrocyte, platelet, CRP, and transaminase levels were significantly higher in the overweight/obese group (p = 0.0379, p = 0.0002, p = 0.0003, p = 0.0006, p < 0.0001, p = 0.0332, and p < 0.0001, respectively). No significant statistical differences between the two groups in terms of neutrophil, hemoglobin, albumin, total protein, and glycemia levels were noted (p > 0.05). Moreover, NLR and PLR did not differ significantly between the two groups (p = 0.4674 and p = 0.9973, respectively).
Conclusions: Obesity is associated with systemic low-grade inflammation which is reaching alarming rates worldwide among both children and adults. Our study proved that leukocyte, lymphocyte, erythrocyte, and platelet levels are significantly higher in overweight/obese children, emphasizing the inflammatory status related to this condition. Therefore, obesity-related studies involving pediatric patients are of major interest in order to develop appropriate methods to prevent the development of further complications in adulthood.
Obesity is a current global health problem in both children and adults and causes a significant burden. Most studies investigating obesity involves adults; however, it is essential for studies to focus on childhood obesity in order to prevent its associated complications and further development in adulthood. The incidence of this nutritional disorder in children has reached alarming rates worldwide. In Romania, one in four children were found to be either overweight or obese (1). Its etiology is complex, involving an interaction between genetic susceptibility and environmental or “obesogenic” factors, which play a key role in triggering obesity, representing therefore the basis for successful interventions (2).
It is well-documented that obese individuals express a chronic inflammatory status; obesity-related complications, such as cardiovascular disease, type 2 diabetes mellitus, metabolic syndrome, and non-alcoholic steatohepatitis were proven to be results of obesity-associated low-grade inflammation (3, 4). This obesity-related inflammation is due to the malfunction of immune-related activities in the adipose tissue, involving a transient infiltration of neutrophils within the abdominal fat and their binding to adipocytes (5). This process may precede macrophage infiltration similar to that in other inflammatory conditions (5, 6). Moreover, neutrophils are the most important and abundant subtype of white blood cells in human peripheral blood. Neutrophils and chronic inflammation seem to be linked to chronic hypertension and obesity (7), with the total count of circulating neutrophils being increased in obese individuals (8). Besides neutrophils, leukocytes are also associated with obesity-induced chronic inflammatory status, being equally involved in related comorbidity development. Based on this premise, obese individuals without comorbidities are considered to represent a special subgroup in the early stage of inflammation similar to overweight individuals (9).
Multiple serum markers are said to be associated with low-grade chronic inflammation. Neutrophil to lymphocyte ratio (NLR) is a recently discovered, cost-effective marker for the detection of subclinical inflammation that correlates with C-reactive protein (CRP) levels (10–12). This useful marker has been related to multiple inflammatory conditions, cardiovascular diseases, and cancer (13, 14). NLR was shown to be directly related to the degree of inflammation (15). Platelet to lymphocyte ration (PLR) is another biomarker that can be calculated based on the complete blood count (CBC) and has been proven to be useful in the diagnosis and monitoring of several systemic inflammatory processes (16–19). PLR is an indicator of the balance between inflammation and thrombosis. Thus, the inflammatory status results in accelerated megakaryocyte proliferation and associated thrombocytosis. Moreover, increased platelet counts and decreased lymphocyte counts have been shown to be related to both aggregation and inflammation, and thus, represent risk indicators (20, 21). Other blood parameters, such as lymphocytes, monocytes, hemoglobin, erythrocyte sedimentation rate (ESR), total proteins, albumin, iron, cholesterol, triglycerides, and transaminases, and different gene polymorphisms, are related to childhood obesity and overweight (22–29).
The aim of this study was to assess different blood parameters associated with the low grade inflammatory status in overweight and obese children in order to detect the early stages of inflammation related to this nutritional disorder.
Materials and Methods
We performed a prospective study with 191 pediatric patients aged between 5 and 18 years, referred to a Pediatric Tertiary Hospital in Romania, between January 2018 and January 2019 that were assessed on a 1 day admission chart system, without requiring long time hospitalization. However, the parents of only 173 children agreed to sign the informed consent form for their children to be included in the study. After selection according to age and sex, only 164 children were finally included in the study. The children were divided according the value of body mass index (BMI) into two groups: group 1, the study group: 77 overweight and obese children (overweight children: BMI percentile ≥85 and <95, and obese children: BMI percentile >95), and group 2, the control group: 87 children with normal BMI (percentile ≥5 and <85). The inclusion criteria for both groups was an age of between 5 and 18 years. In the study group we included children with a BMI percentile >85, while in the control group we included those with a BMI percentile ≥5 and <85 (30–32). The exclusion criteria consisted of age below 5 years, secondary obesity, patients with obesity-related complications, chronic disorders, infectious diseases, incomplete data, and patients whose parents refused to sign the informed consent form.
All patients underwent a thorough anamnesis and clinical exam; blood parameters were also measured: CBC, ESR, CRP, transaminase, total protein, albumin, and blood glucose levels. Inflammatory biomarkers, such as NLR and PLR, were calculated by dividing the neutrophil count and platelet count, respectively, by the lymphocyte count. The abdominal ultrasound was performed in all children by a single trained clinician. The laboratory parameters were assessed using a Cobas Integra 400 plus automated analyzer, Roche Diagnostics GmbH, Mannheim, Germany. The ultrasound exams were performed with a probe, with variable frequencies between 2.5 and 6 MHz, and an S8 General Electric Machine.
All parents/caregivers signed the informed consent for their children. The study was approved by the Ethics Committee of the University of Medicine and Pharmacy of Târgu Mureş (No 329/November 17th 2017), and it was performed according to the principles of the Helsinki Declaration.
The children' characteristics are presented as means ± standard deviation and medians.
The statistical analysis comprised of descriptive statistical analysis (frequency, media, median, and standard deviations) and inferential statistical elements. D'Agostino & Pearson's tests were applied in order to identify the distribution of the series of analyzed data. We applied the Student t-test for unpaired data, and the Mann-Whitney test for comparison of the medians. A Chi squared test was used for association determination. The significance threshold was considered at a p-value of 0.05. The statistical analysis was performed using GraphPad Prism 7 free trial version, GraphPad Software Inc., California, USA.
Among the 164 children included in the study, the mean age for the study group was 10.79 ± 3.503 years, whereas that for the control group was 12.33 ± 3.516 years (p = 0.0052). Regarding residence area, we found the same distribution of obese children among rural and urban areas (p = 0.8338), without a significance influence of the social status in the development of obesity. According to sex distribution, being overweight/obese was more common in boys (p = 0.0083). Thus, our sample is age- and sex-matched. We also assessed the birth weight, identifying a higher value for control group, 3.278 ± 1.070 kg in comparison to 3.310 ± 0.5603 kg for obese children, but without statistical significance (p = 0.1400). The current weight and BMI of the children included in our study were significantly higher for obese group (p < 0.0001).Thus, the mean value of the current weight was 57.78 ± 20.94 kg for obese children versus 45.36 ± 14.46 kg for control group, while the mean value of BMI in case of obese children was of 25.82 ± 4.518 kg/m2 compared to 18.92 ± 2.934 kg/m2 for normal weight children. Contrariwise, the height was higher for control group, though without statistical significance (p = 0.0263), with a mean value of 152.7 ± 16.19 cm for control group in comparison to 146.8 ± 17.83 cm for obese children. All these descriptive parameters along with the values of the laboratory parameters are mentioned in Table 1.
Among the blood parameters, we found that leukocyte (Figure 1), lymphocyte (Figure 2), erythrocyte, platelet (Figure 3), CRP (Figure 4), and transaminase levels (AST and ALT) were significantly higher in the overweight/obese children in contrast to the control group (p = 0.0379, p = 0.0002, p = 0.0003, p = 0.0006, p < 0.0001, p = 0.0332, and p < 0.0001, respectively).
Nevertheless, we did not encounter any significant statistical differences between the two groups in terms of neutrophil, hemoglobin, albumin, total protein, erythrocyte sedimentation rate (ESR), and glycemia levels (p = 0.1063, p = 0.1776, p = 0.2295, p = 0.5676, p = 0.2122, and p = 0.3338, respectively). Moreover, NLR and PLR did not differ significantly between the two groups (p = 0.4674 and p = 0.9973, respectively).
Regarding the results of the abdominal ultrasound, we found pathological changes, such as hepatomegaly and hepatic steatosis, in 77.92% of the overweight/obese children, whereas, in the control group, only three children were identified to have hepatomegaly (3.44%). Thus, hepatomegaly and hepatic steatosis were significantly more frequent in the overweight/obese group than in the normal BMI group (p > 0.0001) (Table 2).
The World Health Organization stated that the prevalence of obesity worldwide has nearly tripled since 1975 (33). Thus, in 2016, 41 million children below the age of 5 years were overweight or obese (33). The prevalence of obesity increases with age, with over 340 million children and adolescents aged between 5 and 19 years being affected with this condition in 2016 (33). Obesity is an important leading cause of mortality worldwide, being associated with increased risk for heart failure, stroke, skeletal system diseases, and malignancies (33).
The adipose tissue has been proven to contribute to both the initiation and maintenance of systemic inflammation (5, 34). Adipose tissue-related inflammation leads to a wide variety of immune responses, involving neutrophil participation in the early phases followed by macrophage involvement and mast cell polarization (35, 36). Studies performed on mice proved that the neutrophil count significantly increases within the adipose tissue even in the first days after the initiation of a high fat diet (37), suggesting that obesity, even in its early stages, is associated with systemic inflammation. Similar findings were also reported in humans in the study of Tam et al. (38), who underlined that acute lipid overload is related to the increase of inflammatory biomarkers, such as CRP and monocyte chemoattractant protein-1. Our study sustains the findings of Tam et al. regarding the CRP, which was significantly higher in the obese/overweight children included in this research. Recently, a wide range of biomarkers were found to be related to low-grade systemic inflammations, such as CBC parameters, NLR, PLR, mean platelet volume, and CRP among others. Thus, it was proven that the peripheral blood of otherwise healthy overweight/obese individuals exhibit characteristics of a low-grade inflammation (6).
White blood cells were shown to be associated with the development of metabolic syndrome (39, 40). A study performed with 6,700 patients found positive correlations between waist circumference and leukocyte, lymphocyte, neutrophil, and platelet levels, and medium platelet volume (41). Moreover, another study including 223 subjects showed that an increase in BMI results in increased leukocyte, lymphocyte, platelet, and neutrophil counts (42). Similar to the findings of the previously mentioned study, our study showed a significant correlation between being overweight/obese and leukocyte, platelet, lymphocyte, and erythrocyte counts. However, it failed to show a significant association of these conditions with the neutrophil count. Despite the fact that NLR and PLR are immune response markers related to chronic inflammation (19, 43), we did not find significant correlations between these markers and obesity/overweight. The lack of correlation between NLR and BMI in our study might be explained by the significant increase in lymphocyte count among overweight/obese children. Most likely, PLR did not correlate with an increased BMI in our study due to the significant increase in both platelet and lymphocyte counts in the overweight/obese group. Recent studies emphasize the role of NLR as a potential inflammation marker in not only cardiac and non-cardiac disorders, but also autoimmune conditions and infections (44, 45). Inflammatory status is reflected by neutrophil counts, while the lymphocyte count is linked to the nutritional status and general stress (46). The increase in neutrophil count was proven to be directly related to the degree of obesity (47). Thus, the fact that in our study we did not find a significant increase in neutrophil count among the study group might be explained by the young age of our subjects, resulting in an insufficient amount of time for chronic inflammation to occur. Moreover, multiple studies have focused on assessing the role of NLR and PLR in patients with related-comorbidities; a study performed with 155 obese and non-obese patients with obstructive sleep apnea found significantly higher values in terms of NLR among obese individuals (46). Metabolic syndrome related obesity is another disorder commonly associated with chronic inflammation that was found to be related with NLR (48). Nevertheless, the findings remain contradictory because similar to our study, Bahadir et al. also failed to prove an association between NLR and obesity or metabolic syndrome (49). Diabetes mellitus and its related metabolic malfunctions are also associated with an increased NLR (50).
Most obesity-related studies have been performed using adult participants and stated that the wide range of associated comorbidities hinder the elucidation of a cause-effect link between inflammation and obesity (51). Similar to our study, Aydin et al. performed a study with 187 children (130 obese individuals and 57 healthy controls) (51). They found that the age of obese children was lower than that of the healthy controls in their study. Regarding blood parameters, the authors showed that lymphocyte and neutrophil counts, and NLR were significantly higher in obese children. Similarly, our study also showed a significant increase in lymphocyte count among overweight/obese children, but it failed to show significant differences in terms of neutrophil count and NLR between the normal BMI children and those with high BMI. Moreover, the previously mentioned study (51) did not identify any significant differences between obese and normal weight children with respect to PLR, as in our study. These contradictory findings might be explained by the fact that pediatric cases are rarely accompanied by obesity-related complications.
The limitations of our study consist of the relatively small sample size and the lack of correlation with dietary habits and the assessment of related complications. Conversely, this study will make a significant contribution to the existing literature as it involved pediatric patients and was able to identify the risk factors associated with the early phases of obesity-related inflammatory process. Moreover, to the best of our knowledge, this is the first study in Romania that assessed the role of CBC parameters, NLR, and PLR in overweight/obese children.
Obesity is associated with systemic low-grade inflammation and is reaching alarming rates worldwide among both children and adults. Our study proved that leukocyte, lymphocyte, erythrocyte, and platelet counts are significantly higher in overweight/obese children, emphasizing the early inflammatory status related to this condition. Therefore, obesity-related studies involving pediatric patients are crucial in order to develop appropriate methods for preventing the development of further complications in adulthood.
The study was approved by the Ethics Committee of the University of Medicine and Pharmacy of Târgu Mureş (No 329/ November 17th 2017), and it was performed according to the principles of the Helsinki Declaration. The consent procedure used in our study consisted in an informed written consent that was signed by all parents/caregivers for their children prior to the inclusion in the study. The study was also explained to the children signed and we obtained their verbal assent.
CM, LM, and MM conceptualized and designed the study, drafted the initial manuscript, and reviewed, and revised the manuscript. MM and LM designed the data collection instruments, collected data, carried out the initial analyses, and reviewed and revised the manuscript. DG performed the statistical analysis. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work.
This research was partially supported by the UEFISCDI grant: The development of an innovative diagnostic guide of obese child through genetics, anthropometric, bioimpedance, and ultrasound assessment, project number: 8159/27.07.2017–PN-III-P4-ID-PCE-2016-0766.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
ALT, alanine aminotransferase; AST, aspartate aminotransferase; BMI, body mass index; CBC, complete blood cellular; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; n, number; NLR, neutrophil/lymphocyte ratio; PLR, platelets/lymphocyte ratio; SD, standard deviation.
1. Chirita-Emandi A, Barbu CG, Cinteza EE, Chesaru BI, Gafencu M, Mocanu V, et al. Overweight and underweight prevalence trends in children from Romania–pooled analysis of cross-sectional studies between 2006 and 2015. Obes Facts. (2016) 9:206–20. doi: 10.1159/000444173
5. Elgazar-Carmon V, Rudich A, Hadad N, Levy R. Neutrophils transiently infiltrate intra-abdominal fat early in the course of high-fat feeding. J Lipid Res. (2008) 49:1894–903. doi: 10.1194/jlr.M800132-JLR200
6. Trellakis S, Rydleuskaya A, Fischer C, Canbay A, Tagay S, Scherag A, et al. Low adiponectin, high levels of apoptosis and increased peripheral blood neutrophil activity in healthy obese subjects. Obes Facts. (2012) 5:305–18. doi: 10.1159/000339452
9. Vargas R, Ryder E, Diez-Ewald M, Mosquera J, Durán A, Valero N, et al. Increased C-reactive protein and decreased Interleukin-2 content in serum from obese individuals with or without insulin resistance: associations with leukocyte count and insulin and adiponectin content. Diabetes Metab Syndr. (2016) 10 (1 Suppl. 1):S34–41. doi: 10.1016/j.dsx.2015.09.007
10. Keskin Kurt R, Okyay AG, Hakverdi AU, Gungoren A, Dolapcioglu KS, Karateke A, et al. The effect of obesity on inflammatory markers in patients with PCOS: a BMI-matched case-control study. Arch Gynecol Obstet. (2014) 290:315–9. doi: 10.1007/s00404-014-3199-3
11. Celikbilek M, Dogan S, Ozbakir O, Zararsiz G, Kücük H, Gürsoy S, et al. Neutrophil-lymphocyte ratio as a predictor of disease severity in ulcerative colitis. J Clin Lab Anal. (2013) 27:72–6. doi: 10.1002/jcla.21564
12. Imtiaz F, Rashed MS, Al-Mubarak B, Allam R, El-Karaksy H, Al-Hassnan Z, et al. Identification of mutations causing hereditary tyrosinemia type I in patients of Middle Eastern origin. Mol Genet Metab. (2011) 104:688–90. doi: 10.1016/j.ymgme.2011.06.019
14. Templeton AJ, McNamara MG, Šeruga B, Vera-Badillo FE, Aneja P, Ocaña A, et al. Prognostic role of neutrophil-to-lymphocyte ratio in solid tumors: a systematic review and meta-analysis. J Natl Cancer Inst. (2014) 106:dju124. doi: 10.1093/jnci/dju124
15. Imtiaz F, Shafique K, Mirza SS, Ayoob Z, Vart P, Rao S. Neutrophil lymphocyte ratio as a measure of systemic inflammation in prevalent chronic diseases in Asian population. Int Arch Med. (2012) 5:2. doi: 10.1186/1755-7682-5-2
16. Saşkin H, Düzyol Ç, Özcan KS, Aksoy R, Idiz M. Preoperative platelet to lymphocyte ratio is associated with early morbidity and mortality after coronary artery bypass grafting. Heart Surg Forum. (2015) 18:E255–62. doi: 10.1532/hsf.1341
17. Tagawa T, Anraku M, Morodomi Y, Takenaka T, Okamoto T, Takenoyama M, et al. Clinical role of a new prognostic score using platelet-to-lymphocyte ratio in patients with malignant pleural mesothelioma undergoing extrapleural pneumonectomy. J Thorac Dis. (2015) 7:1898–906. doi: 10.3978/j.issn.2072-1439.2015.11.15
19. Sahin F, Yildiz P. Serum platelet, MPV, PCT and PDW values, neutrophil to lymphocyte and platelet to lymphocyte ratios in lung cancer diagnosis. Eur Respir J. (2015) 46 (Suppl. 59):PA4279. doi: 10.1183/13993003.congress-2015.PA4279
20. Çakiroglu Y, Vural F, Vural B. The inflammatory markers in polycystic ovary syndrome: association with obesity and IVF outcomes. J Endocrinol Invest. (2016) 39:899–907. doi: 10.1007/s40618-016-0446-4
22. Mărginean C, Mărginean CO, Bănescu C, Melit L, Tripon F, Iancu M. Impact of demographic, genetic, and bioimpedance factors on gestational weight gain and birth weight in a Romanian population: a cross-sectional study in mothers and their newborns: the Monebo study (STROBE-compliant article). Medicine. (2016) 95:e4098. doi: 10.1097/MD.0000000000004098
23. Mărginean C, Mărginean CO, Iancu M, Szabo B, Cucerea M, Melit LE, et al. The role of TGF-β1 869 T > C and PPAR γ2 34 C > G polymorphisms, fat mass, and anthropometric characteristics in predicting childhood obesity at birth: a cross-sectional study according the parental characteristics and newborn's risk for child obesity (the newborns obesity's risk) NOR study. Medicine. (2016) 95:e4265. doi: 10.1097/MD.0000000000004265
24. Mărginean CO, Bănescu C, Duicu C, Voidăzan S, Mărginean C. Angiotensin-converting enzyme gene insertion/deletion polymorphism in nutritional disorders in children. Eur J Nutr. (2015) 54:1245–54. doi: 10.1007/s00394-014-0802-0
25. Mărginean CO, Mărginean C, Voidăzan S, Melit L, Crauciuc A, Duicu C, et al. Correlations between leptin gene polymorphisms 223 A/G, 1019 G/A, 492 G/C, 976 C/A, and anthropometrical and biochemical parameters in children with obesity: a prospective case-control study in a romanian population-the nutrichild study. Medicine. (2016) 95:e3115. doi: 10.1097/MD.0000000000003115
26. Mârginean C, Mărginean C, Iancu M, Moldovan V, Melit ´ L, Bănescu C. The impact of TNF-α 308G>A gene polymorphism in child's overweight risk coupled with the assessment of biochemical parameters – a cross-sectional single center experience. Pediatr Neonatol. (2018) 60:19–27. doi: 10.1016/j.pedneo.2018.03.003
27. Mărginean C, Bănescu CV, Măarginean CO, Tripon F, Melit LE, Iancu M. Glutathione S-transferase (GSTM1, GSTT1) gene polymorphisms, maternal gestational weight gain, bioimpedance factors and their relationship with birth weight: a cross-sectional study in Romanian mothers and their newborns. Rom J Morphol Embryol. (2017) 58:1285–93.
28. Oana MC, Claudia B, Carmen D, Maria PA, Septimiu V, Claudiu M. The role of IL-6 572 C/G, 190 C/T, and 174 G/C gene polymorphisms in children's obesity. Eur J Pediatr. (2014) 173:1285–96. doi: 10.1007/s00431-014-2315-5
29. Mărginean C, Mărginean CO, Iancu M, Melit LE, Tripon F, Bănescu C. The FTO rs9939609 and LEPR rs1137101 mothers-newborns gene polymorphisms and maternal fat mass index effects on anthropometric characteristics in newborns: a cross-sectional study on mothers-newborns gene polymorphisms-The FTO-LEPR Study (STROBE-compliant article). Medicine. (2016) 95:e5551. doi: 10.1097/MD.0000000000005551
31. Mantzouranis N, Pilianidis T, Douda H, Tokmakidis S. Comparison of international obesity taskforce cutoffs, centers for disease control and prevention growth charts, and body mass index Z-score values in the prevalence of childhood obesity: the Greek obesity and lifestyle study. Pediatrics. (2008) 121(Suppl. 2):S149. doi: 10.1542/peds.2007-2022GGGGGG
32. Defining Childhood Obesity|Overweight & Obesity|CDC. Available online at: https://www.cdc.gov/obesity/childhood/defining.html (accessed January 20, 2019).
33. WHO|Overweight, and Obesity,. Available online at: https://www.who.int/gho/ncd/risk_factors/overweight/en/ (accessed January 25, 2019).
34. Pecht T, Gutman-Tirosh A, Bashan N, Rudich A. Peripheral blood leucocyte subclasses as potential biomarkers of adipose tissue inflammation and obesity subphenotypes in humans. Obes Rev. (2014) 15:322–37. doi: 10.1111/obr.12133
37. Talukdar S, Oh DY, Bandyopadhyay G, Li D, Xu J, McNelis J, et al. Neutrophils mediate insulin resistance in mice fed a high-fat diet through secreted elastase. Nat Med. (2012) 18:1407–12. doi: 10.1038/nm.2885
38. Tam CS, Viardot A, Clément K, Tordjman J, Tonks K, Greenfield JR, et al. Short-term overfeeding may induce peripheral insulin resistance without altering subcutaneous adipose tissue macrophages in humans. Diabetes. (2010) 59:2164–70. doi: 10.2337/db10-0162
39. Fadini GP, Marcuzzo G, Marescotti MC, de Kreutzenberg SV, Avogaro A. Elevated white blood cell count is associated with prevalence and development of the metabolic syndrome and its components in the general population. Acta Diabetol. (2012) 49:445–51. doi: 10.1007/s00592-012-0402-5
40. Jung CH, Lee WY, Kim BY, Park SE, Rhee EJ, Park CY, et al. The risk of metabolic syndrome according to the white blood cell count in apparently healthy Korean adults. Yonsei Med J. (2013) 54:615–20. doi: 10.3349/ymj.2013.54.3.615
41. Vuong J, Qiu Y, La M, Clarke G, Swinkels DW, Cembrowski G. Reference intervals of complete blood count constituents are highly correlated to waist circumference: should obese patients have their own “normal values?” Am J Hematol. (2014) 89:671–7. doi: 10.1002/ajh.23713
42. Furuncuoglu Y, Tulgar S, Dogan AN, Cakar S, Tulgar YK, Cakiroglu B. How obesity affects the neutrophil/lymphocyte and platelet/lymphocyte ratio, systemic immune-inflammatory index and platelet indices: a retrospective study. Eur Rev Med Pharmacol Sci. (2016) 20:1300–6.
43. Hong X, Cui B, Wang M, Yang Z, Wang L, Xu Q. Systemic immune-inflammation index, based on platelet counts and neutrophil-lymphocyte ratio, is useful for predicting prognosis in small cell lung cancer. Tohoku J Exp Med. (2015) 236:297–304. doi: 10.1620/tjem.236.297
44. Dogan M, Akyel A, Bilgin M, Erat M, Çimen T, Sunman H, et al. Can admission neutrophil to lymphocyte ratio predict infarct-related artery patency in ST-segment elevation myocardial infarction. Clin Appl Thromb Hemost. (2015) 21:172–6. doi: 10.1177/1076029613515071
45. Ozbay I, Kahraman C, Balikci HH, Kucur C, Kahraman NK, Ozkaya DP, et al. Neutrophil-to-lymphocyte ratio in patients with peripheral vertigo: a prospective controlled clinical study. Am J Otolaryngol. (2014) 35:699–702. doi: 10.1016/j.amjoto.2014.08.004
46. Bozkuş F, Dikmen N, Samur A, Bilal N, Atilla N, Arpag H. Does the neutrophil-to-lymphocyte ratio have any importance between subjects with obstructive sleep apnea syndrome with obesity and without obesity? Tuberk Toraks. (2018) 66:8–15. doi: 10.5578/tt.66535
48. Syauqy A, Hsu CY, Rau HH, Chao JC. Association of dietary patterns, anthropometric measurements, and metabolic parameters with C-reactive protein and neutrophil-to-lymphocyte ratio in middle-aged and older adults with metabolic syndrome in Taiwan: a cross-sectional study. Nutr J. (2018) 17:106. doi: 10.1186/s12937-018-0417-z
49. Bahadir A, Baltaci D, Türker Y, Türker Y, Iliev D, Öztürk S, et al. Is the neutrophil-to-lymphocyte ratio indicative of inflammatory state in patients with obesity and metabolic syndrome? Anatol J Cardiol. (2015) 15:816–22. doi: 10.5152/akd.2014.5787
50. Lee CT, Harris SB, Retnakaran R, Gerstein HC, Perkins BA, Zinman B, et al. White blood cell subtypes, insulin resistance and β-cell dysfunction in high-risk individuals–the PROMISE cohort. Clin Endocrinol. (2014) 81:536–541. doi: 10.1111/cen.12390
Keywords: children, overweight, obese, neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ration (PLR)
Citation: Mărginean CO, Meliţ LE, Ghiga DV and Mărginean MO (2019) Early Inflammatory Status Related to Pediatric Obesity. Front. Pediatr. 7:241. doi: 10.3389/fped.2019.00241
Received: 26 January 2019; Accepted: 28 May 2019;
Published: 18 June 2019.
Edited by:Mauro Fisberg, Federal University of São Paulo, Brazil
Reviewed by:Emer Fitzpatrick, King's College London, United Kingdom
Juan Francisco Rivera-Medina, Instituto Nacional de Salud del Niño, Peru
Copyright © 2019 Mărginean, Meliţ, Ghiga and Mărginean. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Lorena Elena Meliţ, firstname.lastname@example.org