Moderate dietary flavonoid intake associated with lower prevalence of Parkinson's disease: data from the NHANES 2007-2010 and 2017-2018.

Objective: To investigate the relationship between dietary flavonoids and the prevalence of PD.

Methods: We used data from the 2007-2010 and 2017-2018 National Health and Nutrition Examination Survey (NHANES). Dietary flavonoid intake was assessed through a two-day, 24-hour dietary recall method, and PD diagnosis was ascertained by the presence of 'Anti-Parkinson agents' among the reported prescription medications. Logistic regression, subgroup, and restricted cubic spline (RCS) models were employed to analyze the connection between dietary flavonoids and PD prevalence.

Results: Our study revealed a correlation between the consumption of dietary total flavonoids, flavan-3-ols, and flavonols, and PD risk. Subgroup analysis indicated a negative correlation of dietary flavan-3-ols and total flavonoids with PD risk only among non-obese participants. Furthermore, our analysis using RCS demonstrated a nonlinear association between dietary flavonoids, flavan-3-ols, flavonols, and PD prevalence. We found that the optimal intake of total flavonoids, flavan-3-ols and flavonols wase 403.65 mg/day,346 mg/day and 26.74 mg/day, respectively. Above these thresholds, the risk of developing PD is elevated.

Conclusions: Our study highlights a significant association between moderate dietary intake of total flavonoids, flavan-3-ols, and flavonols, and a reduced risk of PD. Our work may provide new therapeutic ideas for the prevention and treatment of PD and provide dietary flavonoid intake recommendations for PD patients.