title: [The relationship between serum leptin level and metabolic syndrome among a middle-aged Chinese population].
abstract: OBJECTIVE
  To explore the relationship between serum level of leptin and the components of metabolic syndrome in a group of mid-aged Chinese population.
  
  
  METHODS
  345 adults (184 men and 161 women) aged 46 - 53 were enrolled from Fetal Origin of Adult Disease (FOAD) cohort to participate the clinic examination including anthropometry, measurements of blood pressure, fasting and 2 hr plasma levels of glucose and insulin, serum levels of lipid and leptin. HOMA-IR index was calculated to estimate individual insulin resistance. Metabolic syndrome (MS) was diagnosed according to the definition criteria issued by the International Diabetes Federation (IDF) in 2005.
  
  
  RESULTS
  The prevalences of central obesity, higher serum level of triglyceride (TG), lower serum level of high-density lipoprotein (HDL-C), IFG, higher blood pressure and MS were 53.0%, 47.5%, 34.2%, 26.7%, 33.9%, 31.9% in this mid-aged population, respectively. Serum geometric mean level of leptin was higher in females than in males. Serum level of leptin increased with the prevalence of MS and components of abnormal metabolism. The serum level of leptin compared with central obesity, higher blood pressure, higher serum level of triglyceride (TG), lower serum level of high-density lipoprotein cholesterol (HDL-C), IFG and MS was significantly higher respectively (P < 0.05) without HDL-C in males. The serum level of leptin increased with the number of components of abnormal metabolism subjects had (P < 0.001).
  
  
  CONCLUSIONS
  The serum level of leptin in this population is significantly associated with MS and components of MS. Hyperleptinemia could be a new component of metabolic syndrome. It might be a target in selection of MS and relative diseases.
authors.affiliation: Department of Epidemiology, Capital Institute of Pediatrics, Beijing 100020, China.
authors.forename: Xiu-yuan
authors.initials: XY
authors.lastname: Ding
authors.forename: Jie
authors.initials: J
authors.lastname: Mi
authors.forename: Hong
authors.initials: H
authors.lastname: Cheng
authors.forename: Xiao-yuan
authors.initials: XY
authors.lastname: Zhao
authors.forename: Dong-qing
authors.initials: DQ
authors.lastname: Hou
mesh_terms: D002681:China / Q000453:epidemiology; D008076:Cholesterol, HDL / Q000097:blood; D015331:Cohort Studies; D005260:Female; D006801:Humans; D006946:Hyperinsulinism / Q000097:blood; D007328:Insulin / Q000378:metabolism; D007333:Insulin Resistance; D020738:Leptin / Q000097:blood*; D008297:Male; D024821:Metabolic Syndrome / Q000097:blood* / Q000453:epidemiology; D008875:Middle Aged; D009765:Obesity / Q000097:blood
chemical_list: D008076:Cholesterol, HDL; D007328:Insulin; D020738:Leptin