Effect of green tea consumption on human brain function in resting-state functional MRI

Area of Science:

• Neuroscience
• Nutritional Neuroscience
• Medical Imaging

Background:

• Green tea is known for psychological and cognitive benefits.
• Research on green tea's neural mechanisms often focuses on single compounds, not whole-leaf tea.
• Understanding the effects of whole green tea on brain activity is crucial.

Purpose of the Study:

• To investigate the effects of natural green tea consumption on human brain activity.
• To examine changes in regional homogeneity and functional connectivity using resting-state functional MRI.
• To explore the neural underpinnings of green tea's cognitive benefits.

Main Methods:

• A randomized controlled trial involving 15 healthy volunteers.
• Two imaging sessions: one with green tea, one with water (control).
• Resting-state functional MRI (fMRI) was used to analyze brain activity before and after consumption.

Main Results:

• Green tea consumption increased regional homogeneity in frontal, parietal, and occipital areas.
• Decreased regional homogeneity was observed in the left cuneus and left lingual gyrus.
• Functional connectivity decreased in default mode, sensory, visual, and frontoparietal networks, but enhanced in memory-related regions.

Conclusions:

• Natural green tea consumption alters brain activity during a resting state.
• These alterations suggest a modulation of neural networks involved in cognitive functions.
• The findings provide insights into the neurobiological effects of whole green tea.