Impact of Chewing Behavior Change on Cognition and Cerebral Hemodynamics.

In 30 seconds

This randomized controlled trial tested whether encouraging thorough chewing during meals affects cognition and cerebral hemodynamics in adults aged 65 years or older. Fifty participants were assigned to a 1-month wearable-device intervention to increase chewing strokes or to usual chewing. Significant time-by-group interactions were reported for memory (F (1, 48) = 6.24, P = 0.043) and left dorsolateral prefrontal cortex hemodynamic responses (F (1, 48) = 6.19, P = 0.013). The intervention group increased chewing frequency and improved memory, alongside reduced left-sided cortical responses; other outcomes did not differ significantly.

Key findings

• Memory showed a significant time-by-group interaction: F (1, 48) = 6.24, P = 0.043.
• Left DLPFC hemodynamic responses showed a significant time-by-group interaction: F (1, 48) = 6.19, P = 0.013.
• Chewing frequency increased in the intervention group (P = 0.017) and correlated positively with Stroop test scores (r = 0.53, P = 0.010).
• Other cognitive outcomes and hemodynamic measures favored intervention but did not reach statistical significance.

Why it matters

The findings suggest that a behavioral change during meals may influence memory performance and task-related prefrontal hemodynamics in older adults. The observed reduction in left DLPFC responses alongside improved memory is consistent with the authors’ interpretation of greater neural efficiency, but does not establish a mechanism or demonstrate prevention of cognitive decline or dementia.

What to keep in mind

The intervention lasted only 1 month and included 50 participants; longer studies are needed to assess whether effects persist.