Obesity and Alzheimer's Disease: A Link Between Body Weight and Cognitive Function in Old Age by Naderali et al note that obesity is a risk factor for diabetes, hypertension, and cardiovascular abnormalities. The vascular effects affect the risk of dementia and Alzheimer's disease. The mechanism of the association between adiposity and impairment of cognitive performance is undefined. Their review examines the impact of obesity on cognitive function with an eye toward underlying disease mechanisms. It is useful to be aware of the link between obesity and cognition because this is a modifiable risk factor.
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