Obesity has become an important risk factor for chronic kidney disease (CKD). The metabolically healthy obese (MHO) phenotype refers to obese individuals with a favorable metabolic profile. However, its prognostic value remains controversial and may depend on the health outcome being investigated. To assess this, we examined the risk of MHO phenotype with incident CKD in a Korean population of 41,194 people without CKD. Individuals were stratified by body mass index (cutoff value, 25.0 kg/m(2)) and metabolic health state (assessed using Adult Treatment Panel-III criteria). Incident CKD was defined as a glomerular filtration rate of <60 ml/min per 1.73 m(2) calculated using the Chronic Kidney Disease Epidemiology Collaboration equation. Over the median follow-up period of 38.7 months, 356 of the individuals developed incident CKD. Compared with the metabolically healthy nonobese (MHNO) group, the MHO group showed increased risk of incident CKD with a multivariate-adjusted hazard ratio of 1.38 (95% CI, 1.01-1.87). Nonobese but metabolically unhealthy individuals were at an increased risk of incident CKD (multivariate-adjusted hazard ratio, 1.37 (95% CI, 1.02-1.93)) than the MHNO group. Metabolically unhealthy obese individuals were at the highest risk of incident CKD. Thus, a healthy metabolic profile does not protect obese adults from incident CKD. Hence, it is important to consider metabolic health along with obesity when evaluating CKD risk.
BackgroundThe prevalence of metabolic syndrome has markedly increased worldwide. However, studies in the United States show that it has remained stable or slightly declined in recent years. Whether this applies to other countries is presently unclear.ObjectivesWe examined the trends in the prevalence of metabolic syndrome and its components in Korea.MethodsThe prevalence of metabolic syndrome and its components was estimated in adults aged >30 years from the Korean National Health Insurance Service data from 2009 to 2013. The revised National Cholesterol Education Program criteria were used to define metabolic syndrome.ResultsApproximately 10 million individuals were analyzed annually. The age-adjusted prevalence of metabolic syndrome increased from 28.84% to 30.52%, and the increasing trend was more prominent in men. Prevalence of hypertriglyceridemia, low HDL-cholesterol, and impaired fasting plasma glucose significantly increased. However, the prevalence of hypertension decreased in both genders. The prevalence of abdominal obesity decreased in women over 50 years-of-age but significantly increased in young women and men (<50 years).ConclusionsThe prevalence of metabolic syndrome is still increasing in Korea. Trends in each component of metabolic syndrome are disparate according to the gender, or age groups. Notably, abdominal obesity among young adults increased significantly; thus, interventional strategies should be implemented particularly for this age group.
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