Non-linear association between dietary fiber intake and cognitive function mediated by vitamin E: a cross-sectional study in older adults.

However, the mediation effect did not reach statistical significance in participants with depression or borderline diabetes, which is likely attributable to the limited sample size in these subgroups (depression: n = 225; borderline diabetes: n = 118). 4 Discussion Through analysis of data from 2,713 older adults aged ≥60 years in the NHANES 2011–2014 database, there appears to be J-shaped relationships between dietary fiber intake and both DSST and total cognitive scores, suggesting the existence of optimal intake ranges.

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