Primary prevention of atherosclerotic disease remains a big challenge. Currently, it is not clear how to treat those subjects with evidence of pre-clinical atherosclerosis but without obvious conventional risk factors. This randomized, placebo controlled, double blind study is to evaluate the effect of Atorvastatin 10 mg daily, therapeutic lifestyle change, and their combination, on the progression of CIMT in those with higher baseline CIMT value but are not belong to 'high risk' category, according to the conventional risk factors.