Health · Medical Research · 1 day ago
Higher body weight linked to longer survival after dementia diagnosis
Researchers analyzed health records from 4,523 US adults aged 51 and older who developed dementia during a follow-up period of up to 20 years.
They compared death rates across four groups based on body mass index: normal weight, overweight, class 1 obesity, and class 2 or 3 obesity.
Compared with people at normal weight, the overweight group had a 16 percent lower risk of death, while the two obesity groups had risks 27 percent and 22 percent lower.
The researchers accounted for several other factors, including smoking and chronic health conditions, and checked whether earlier weight loss might explain the result.
They say the finding does not show that higher weight causes longer life or that people with dementia should try to gain weight.
One possible explanation is that dementia can make it harder to eat, so people with more body reserves may be less affected by poor nutrition.
Further research tracking weight and eating habits over time is needed to understand the link.
A study found that people with higher body weight had a lower risk of death after developing dementia.
Researchers analyzed health records from 4,523 US adults aged 51 and over who developed dementia during the study period.
Compared with people of normal weight, those who were overweight had a 16 percent lower risk of death, while the risks were 27 percent lower for class 1 obesity and 22 percent lower for class 2/3 obesity.
The findings do not show that higher weight directly causes longer survival, and researchers said people with dementia should not try to gain weight based on the study.
The researchers said nutrition may be important for the health and survival of people with dementia, but more research is needed to explain the association.
- Who
- Researchers from the US and Canada analyzed health records from 4,523 US adults aged 51 and over who developed dementia.
- What
- The study found that higher body weight was associated with a lower risk of death after a dementia diagnosis.
- When
- The records covered a follow-up period of up to 20 years. The article was published on 2026-10-10.
- Where
- The study analyzed records of US adults.
- Why
- The reason for the association is unclear. Researchers suggested that extra body reserves may help when dementia affects eating and nutrition.
This story does not have two clearly opposing sides.
This doesn't mean that patients with dementia should attempt to become overweight or obese, as our study was not designed to test that question
But our findings do suggest that weight status may serve as a useful prognostic signal for survival at the time of dementia diagnosis.
Our analyses suggest that the major sources of bias we examined do not explain the survival advantage associated with higher weight.
Participants did not have dementia, and their body mass index was used to place them into four weight groups.
Participants went on to develop dementia, and researchers compared death risks across the weight groups.
- Participants
- 4,523 US adults aged 51 and over
- Follow-up
- Up to 20 years
- Overweight group
- 16 percent lower risk of death than the normal-weight group
- Class 1 obesity group
- 27 percent lower risk of death than the normal-weight group
- Class 2/3 obesity group
- 22 percent lower risk of death than the normal-weight group
Sources
Related news
Pope Leo XIV to have lung nodule removed in surgery this week
Pope Leo to have surgery to remove an early-detected lung nodule
Pope Leo XIV to have surgery to remove early-stage lung nodule
Electroacupuncture reduced post-shingles pain in a clinical trial
AI model uses past mammograms to estimate breast cancer risk
ADHD and Later Cognitive Diagnoses: Why the Risk Estimate Needs Context
Higher Pre-Surgery A1c Linked to Macular Edema Risk After Cataract Surgery
PRIMA retinal implant showed control of geographic atrophy for up to 3 years
Pedro Bial says he has emphysema linked to past smoking
Bonn researchers reset age markers in human cells in the lab
Google’s AMIE chatbot may help doctors prepare for patient visits
