Futurity · Health

Obesity Linked to Longer Survival After Dementia Diagnosis

Individuals diagnosed with dementia who are overweight or obese may live longer than those of normal weight, according to a study. Weight status at diagnosis could be a prognostic indicator, highlighting nutrition's importance.

The study analyzed over 4,500 US adults aged 51+ who developed dementia. Overweight or obese individuals at diagnosis had a significantly lower mortality risk: overweight (16%), class 1 obesity (27%), and class 2/3 obesity (22%).

Potential biases like pre-diagnosis weight loss or "survivor" bias were examined but did not significantly explain the survival advantage.

Excess weight might offer benefits like greater energy reserves or muscle mass, crucial as dementia patients often lose weight due to appetite loss and feeding difficulties.

Lead author Virginia Chang noted that weight status is a useful prognostic signal, and nutrition is key for dementia patient health and survival.

Co-author Yuan Zhang stated that while physiological reasons for weight benefits are plausible, exact mechanisms are unclear, but weight status remains a meaningful prognostic indicator.

The study, published in the Journal of Alzheimer's Disease, was supported by the National Institutes of Health and involved researchers from NYU, Columbia University, USC, and the University of Toronto.

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