Abstract
The relationship between dietary flavonoid intake and mortality in the diabetic kidney disease (DKD) population is unknown. So this study is aimed at investigating the association of total dietary flavonoid intake and their subclasses with all-cause and cardiovascular disease (CVD) mortality. Data of this cohort study were extracted from the NHANES (2007-2010 and 2017-2018). The survival status of participants was determined by linking to the National Death Index through the end of 2019. Flavonoid intake was measured using two 24-h dietary recall interviews. The Kaplan-Meier curves and weighted Cox proportional hazard regression models were used to assess the effect of dietary flavonoid intake on CVD and all-cause mortality, with adjustments for multiple covariates. A total of 1155 participants were included for analysis. After a median follow-up of 76.36 (S.E: 3.24) months, 409 participants died of all-cause mortality, of which 138 died of CVD. In the fully adjusted model, higher total dietary flavonoids intake (HR = 0.69, 95% CI: 0.52-0.92) was associated with lower all-cause mortality and subclasses of higher flavones (HR = 0.60, 95% CI: 0.35-0.85) was also with lower all-cause mortality. In subclasses of flavonoids, higher intake of both anthocyanidins (HR = 0.54, 95% CI: 0.28 to 0.87) and flavones (HR = 0.50, 95% CI: 0.28-0.87) were associated with lower odds of CVD mortality. Higher flavonoid intake was associated with a reduced risk of CVD and all-cause mortality in DKD. Higher flavonoid intake provides a potential opportunity to improve the prognosis of DKD. And future research into the mechanisms between flavonoids and mortality is needed.