Longitudinal association between dietary quality trajectories and cognitive frailty in older adults: a 12-year study of the TIGER cohort.

The study included 519 older adults, with dietary quality assessed at four time points and cognitive frailty evaluated at five time points.

Participants' baseline mean age was 72.7 years.

Valley-Shaped trajectory was consistently associated with impaired memory-frailty (aOR = 0.48-0.56).

Based on stratified analyses, these associations mainly became more evident in participants aged ≥ 75 years, men, those with normal body mass index (18.5-24 kg/m 2 ), apolipoprotein E ε4 non-carriers, those without diabetes, hyperlipidemia, and those with hypertension.