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Objective: The purpose of this study was to estimate the longitudinal variation of prevalence of metabolic syndrome within French families and to observe biological parameters involved in cardiovascular disease among their offspring.Research Design and Methods: Three hundred seventy-one apparently healthy families (1,366 individuals) taken from the STANISLAS cohort were studied. The subjects were examined at two time points with a 5-year interval (t(0) and t(+5)). The crude prevalence of metabolic syndrome was assessed among parents according to the National Cholesterol Education Program Adult Treatment Panel III (NCEP ATP) definition.Results: The prevalence of metabolic syndrome was 5.9% in men and 2.1% in women at t(0), rising to 7.2 and 5.4% in men and women, respectively, at t(+5). Children of parents having metabolic syndrome showed higher levels of tumor necrosis factor-alpha (TNF-alpha), whereas their HDL cholesterol and apolipoprotein (apo) E concentrations were lower compared with those of age- and sex-matched control subjects (P Conclusions: Metabolic syndrome increases with age in supposedly healthy families from the STANISLAS cohort. In offspring of affected people, it seems to be predictive of higher values of TNF-alpha and low HDL cholesterol levels, which are two major cardiovascular factors. Therefore, in terms of prevention, it is important to identify and follow subjects with metabolic syndrome as well as their offspring, even in apparently healthy populations, to enable early disease management. [ABSTRACT FROM AUTHOR]