- Older adults who cooked from scratch at least once a week had a lower risk of dementia in a large Japanese study.
- The link was especially strong in people with fewer cooking skills, suggesting the activity itself may matter.
- The study was observational, so it cannot prove home cooking directly prevents dementia.
Researchers followed 10,978 adults aged 65 and over for six years.
They looked at how often people cooked meals from scratch at home and how skilled they were in the kitchen.
Cases of dementia were identified through the public insurance system.
During follow-up, 1,195 people developed dementia.
People who cooked from scratch at least once a week had a lower risk than those who cooked less than once a week.
The reduction was 23% in men and 27% in women.
Among people with lower cooking skills, cooking at least once a week was linked to a 67% lower risk.
That does not necessarily mean cooking is protective in itself.
But it may reflect a mix of physical activity, planning, memory, sequencing and general day-to-day engagement.
In other words, cooking is not just about food.
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It can also be a mentally and physically active task.
The researchers adjusted for factors such as education, income and other activities linked to cognitive reserve.
Even so, this is still an observational study, and the findings may not translate neatly across different cultures and lifestyles.
Still, it is a useful reminder that everyday routines can matter for brain health.
