This study investigates the effects of regular tea consumption on brain structure and cognitive function in older people. While previous studies have mainly focused on neuropsychological tests, this research uses functional and structural imaging (fMRI and DTI) to analyze possible benefits of tea consumption on brain connectivity.
The results show that regular tea consumption is associated with a more efficient structural organization of the brain. Particularly striking was a lower hemispheric asymmetry in structural connectivity in tea drinkers, suggesting a potentially protective effect against age-related neuronal degeneration. In addition, there was stronger functional connectivity within the default mode network (DMN), which is crucial for cognitive processes.
Conclusion: This study provides initial evidence that regular tea consumption could be associated with better structural brain organization. This could contribute to the prevention of cognitive decline. Further long-term studies are needed to investigate the mechanisms in more detail.
Background:
Tea has been a widely consumed beverage with potential health benefits for thousands of years. Previous research suggests that tea consumption may be associated with improved cognitive function, a lower risk of neurodegenerative diseases and an overall improvement in brain health. However, it remains unclear which neurobiological mechanisms are responsible for this. This study investigates the effects of tea consumption on the structural and functional organization of the brain in older adults.
Aims of the study:
The study aims to analyze the effects of regular tea consumption on brain structure and function. Particular attention is paid to:
1. the global and regional efficiency of neural networks.
2. the functional and structural connectivity of the brain.
3. the hemispheric asymmetry associated with the ageing process.
Methodology:
Older adults (≥ 60 years) were recruited and divided into two groups based on their tea consumption behavior: regular tea drinkers (at least 4 cups per week over decades) and non-tea drinkers. The brain networks were analyzed using functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI). The functional and structural connections were evaluated using graph theory models.
Results:
1. Structural organization of the brain:
– Tea drinkers showed a higher global efficiency of the structural networks.
– Connectivity between different brain regions was better preserved in the tea-drinking group.
2. Functional connectivity:
– Functional connectivity within the default mode network (DMN) was more pronounced in tea drinkers.
– This indicates a better cognitive network organization, which is relevant for memory processes.
3. Reduction of hemispheric asymmetry:
– The left-lateral dominance in structural connectivity was more pronounced in non-tea drinkers, while tea drinkers showed a more balanced brain organization.
– This could be a sign of slower age-related degeneration.
4. Cognitive tests:
– Tea drinkers performed significantly better in cognitive tests of spatial perception and memory.
– The Block Design Test, which measures visual-spatial processing, showed significantly better performance among tea drinkers.
Conclusion:
This study provides initial evidence that regular tea consumption is associated with better structural brain organization and increased functional connectivity in the DMN. This could explain why tea drinkers are less likely to be affected by cognitive decline. The results suggest that tea consumption could be a simple but effective strategy for maintaining brain health in old age. Further research is needed to better understand the long-term effects and underlying mechanisms.