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Extra weight, unexpected protection? A new study of 4,500+ older adults found that being overweight or obese at the time of a dementia diagnosis was linked to a 16%–27% lower risk of death compared to those at normal weight. Researchers believe extra fat and muscle reserves may help patients weather the physical toll of dementia — though they caution this isn't a green light to gain weight.
Extra weight, unexpected protection? A study published in the Journal of Alzheimer's Disease found that older adults who were overweight or obese at the time of their dementia diagnosis had significantly lower mortality risk than those at normal weight. The research, led by Columbia University and NYU School of Global Public Health, tracked 4,523 participants from the Health and Retirement Study over 24 years (1998–2022).
Researchers carefully ruled out major sources of bias — including reverse causality (weight loss before diagnosis), survivor bias, and collider stratification bias — and found none adequately explained the survival advantage. They suspect that extra energy and muscle reserves may help dementia patients cope with the disease's nutritional challenges, such as appetite loss, increased energy expenditure, and difficulty eating.
By the Numbers:
Why it matters: These findings suggest that weight status at dementia diagnosis could serve as a meaningful prognostic signal for clinicians. They also underscore the critical importance of nutrition management in dementia care — a factor that may directly influence how long patients survive.
