Objectives: The fact that metabolic syndrome is accompanied by a low-grade inflammation suggests inflammation may play an important role in the etiology. The aim of our study was to assess the association between heterogeneity of inflammation status and the incidence of metabolic syndrome (MetS) in the metabolically healthy persons who are either obese or nonobese.
Methods: This longitudinal study included all metabolically healthy persons who underwent four or more follow-up comprehensive health examinations either annually or biennially from August 2006 through August 2013 at the Health Promotion Center at Samsung Medical Center, Seoul, Republic of Korea. Metabolic health was defined as absence of any component of the MetS except obesity. We defined obesity using the BMI, which is classified into categories of normal (18.0-22.9 kg/m2), overweight (23-24.9 kg/m2), and obesity (25 kg/m2). Hematological indices such as WBC count or its subtypes (neutrophils, lymphocytes, monocytes) and hsCRP were measured. The outcome was the 7-year cumulative incidence of MetS.
Results: The person-years follow-up were 17,786 in normal weight, 10,376 in overweight, and 7,391 in obesity group. Baseline age, sex, physical activity, smoking, exercise, fasting plasma glucose, HbA1c, blood pressure, lipid profile, hematologic parameters, hsCRP were adjusted. Cox regression multivariate analysis resulted in neutrophil count (> 2,750/mm3) was associated with increased incidence of MetS in normal weight (HR 1.7; CI 1.29-2.35; p <0.001), overweight (HR 1.59; CI 1.29-1.95; p <0.001), and obesity (HR 1.26; CI 1.10-1.45; p<0.001).
Conclusion: This longitudinal analysis showed the neutrophil count is associated with the incidence of MetS in the metabolically heathy persons who are either obese or nonobese. Therefore, inflammatory status could be an independent risk factor for the development of metabolic syndrome irrespective of obesity.
K. Hur: None. M. Choi: None. S. Park: None. S. Lee: None. J. Ahn: None. J. Park: None. H. Park: None. G. Kim: None. S. Jin: None. J. Kim: None. M. Lee: None.