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Background  Previous studies focused on the relationship between body mass index and cognitive disorder and obtained many conflicting results. This study explored the potential effects of body mass index on the risk of mild cognitive impairment (amnestic and non-amnestic) in the elderly.    Methods  The study enrolled 240 amnestic mild cognitive impairment patients, 240 non-amnestic mild cognitive impairment patients and 480 normal cognitive function controls. Data on admission and retrospective data at baseline (6 years ago) were collected from their medical records. Cognitive function was evaluated using Mini-Mental State Examination and Montreal Cognitive Assessment.    Results  Being underweight, overweight or obese at baseline was associated with an increased risk of amnestic mild cognitive impairment ( OR : 2.30, 95% CI : 1.50 ~ 3.52;  OR : 1.74, 95% CI : 1.36 ~ 2.20;  OR : 1.71, 95% CI : 1.32 ~ 2.22, respectively). Being overweight or obese at baseline was also associated with an increased risk of non-amnestic mild cognitive impairment ( OR : 1.51, 95% CI : 1.20 ~ 1.92;  OR : 1.52, 95% CI : 1.21 ~ 1.97, respectively). In subjects with normal weights at baseline, an increased or decreased body mass index at follow-up was associated with an elevated risk of amnestic mild cognitive impairment ( OR : 1.80, 95% CI : 1.10 ~ 3.05;  OR : 3.96, 95% CI : 2.88 ~ 5.49, respectively), but only an increased body mass index was associated with an elevated risk of non-amnestic mild cognitive impairment ( OR : 1.71, 95% CI : 1.16 ~ 2.59).    Conclusions  Unhealthy body mass index levels at baseline and follow-up might impact the risk of both types of mild cognitive impairment (amnestic and non-amnestic).

Association of body mass index with amnestic and non-amnestic mild cognitive impairment risk in elderly