Impacts of Overweight and Obesity in Older Age on the Risk of Dementia: A Systematic Literature Review and a Meta-Analysis.

Background: It is unclear whether overweight and obesity in older age reduces or increases the risk of incident dementia.

Objective: To assess the impacts of overweight and obesity in older age on incident dementia.

Methods: We searched cohort studies reporting body weight measured in older age and dementia through PubMed, Embase, Medline, PyschInfo, and Cochrane library until July 2016.

Association between fish consumption and risk of dementia: a new study from China and a systematic literature review and meta-analysis.

Objective: To assess the association of fish consumption with risk of dementia and its dose-response relationship, and investigate variations in the association among low-, middle- and high-income countries.

Design: A new community-based cross-sectional study and a systematic literature review.SettingsUrban and rural communities in China; population-based studies systematically searched from worldwide literature.

Prevalence and determinants of undetected dementia in the community: a systematic literature review and a meta-analysis.

Objectives: Detection of dementia is essential for improving the lives of patients but the extent of underdetection worldwide and its causes are not known. This study aimed to quantify the prevalence of undetected dementia and to examine its correlates.

Methods/setting/participants: A systematic search was conducted until October 2016 for studies reporting the proportion of undetected dementia and/or its determinants in either the community or in residential care settings worldwide.