“…Considering the limited effectiveness of these interventions, researchers are now more interested in implementing early diagnosis (Saito et al , 2008), disease‐modifying therapeutics (Peritogiannis et al , 2008; Li et al , 2009), and even prevention of dementia (Takahashi et al , 2009). The concept of mild cognitive impairment (MCI) and subjective cognitive impairment (SCI) have been proposed to stimulate the understanding of the earlier, or prodromal, stage of dementia (Takeda et al , 2008), in which the interaction in the aging brain of genetic factors and lifestyle (environmental factors) is the major issue to be elucidated (Azuma et al , 2009).…”