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This study investigated the association between green tea or coffee consumption with cerebral white matter lesions and hippocampal and total brain volumes among 8766 community-dwelling participants recruited from the Japan Prospective Studies Collaboration for Aging and Dementia between 2016 and 2018. A Food Frequency Questionnaire was used to assess green tea and coffee consumption, whereas brain magnetic resonance imaging was performed to assess cerebral white matter lesions, hippocampal volume, and total brain volume. Multivariable-adjusted analysis revealed significant correlations between fewer cerebral white matter lesions and higher green tea consumption, whereas no significant differences were found between green tea consumption and hippocampal or total brain volume. Regarding coffee consumption, no significant differences were observed in cerebral white matter lesions or hippocampal or total brain volumes. Hence, higher green tea consumption was associated with fewer cerebral white matter lesions, suggesting that it may be useful in preventing dementia., Competing Interests: Competing interests: Toshiharu Ninomiya reports receiving grants from Suntory Holdings Limited. The remaining authors declare no competing interests., (© 2025. The Author(s).)

The beneficial effects of water-soluble dietary fiber on liver fat and fibrosis involve the gut microbiota; however, few epidemiological studies have investigated this association. This large-scale epidemiological study aimed to determine the effect of water-soluble dietary fiber intake on liver fat and fibrosis via gut microbiota for the general population. We divided low- and high-intake groups by median daily water-soluble dietary fiber intake and matched background factors by propensity score matching for sex and age. The high-intake group had lower controlled attenuation parameters, a lower fatty liver index, and a lower mac-2-binding protein glycosylated isomer level than the low-intake group. Furthermore, in the high-intake group, the prevalences of metabolic dysfunction-associated steatotic liver disease and cardiometabolic criteria were significantly lower than in the low-intake group. In the high-intake group, there were increases and decreases in 16 bacterial species. Of them, those belonging to Faecalibacterium and Gemmiger had higher relative abundances than the other species and had a negative correlation with the fatty liver index and its components triglyceride and glutamyl transpeptidase in a multivariate analysis adjusted for confounding factors. On the other hand, Dorea showed a significant negative correlation with liver stiffness measure, even though Dorea was decreased in the high-intake group. Faecalibacterium and Gemmiger are butyrate-producing bacteria, suggesting that water-soluble dietary fiber may inhibit fatty liver via gut butyric acid production., Competing Interests: The authors declare they have no conflicts of interest associated with this manuscript., (©2025 BMFH Press.)