Dietary vitamin D intake and 2-year changes in cognitive function in older adults with overweight or obesity and metabolic syndrome

• DOI: 10.1007/s11357-025-01670-1
• Publication Date: 2025-05-06T01:30:17Z
• Authors: Héctor Vázquez-Lo...; Jiaqi Ni; Indira Paz-Graniel; Estefanía Toledo; Dolores Corella; Olga Castañer; J. Alfredo Martínez; Ángel M. Alonso-G...; Julia Wärnberg; Jesús Vioque; Dora Romaguera; José López-Miranda; Ramon Estruch; Francisco J. Tina...; José Lapetra; Lluís Serra-Majem; Amira Bouzalmate-...; Josep A. Tur; Rafael M. Micó Pérez; Marta Fanlo; Miguel Delgado-Ro...; Ana Barabash Bustelo; Josep Vidal; Clotilde Vázquez; Lidia Daimiel; Emili Ros; Fernando Fernánde...; Teresa Rognoni; Nancy Babio; Eva M. Asensio; Karla-Alejandra P...; Antonio Garcia-Rios; Laura Compañ-Gabucio; Raquel Cueto-Galán; M. Angeles Zulet; Mar Nafria; Rosa Casas; Naomi Cano-Ibáñez; Luis Tojal-Sierra; Ana María Gómez-P...; Nuria Goñi; José V. Sorli; María Dolores Zomeño; Antonio P. Arenas...; Pedro Jiménez-Sellés; Javier Basterra-G...; Montserrat Fitó; Jordi Salas-Salvadó

Abstract The protective role of dietary vitamin D intake on cognitive function is of interest, but evidence remains inconsistent. We aimed to evaluate the association between dietary vitamin D intake and 2-year cognitive changes in older adults at risk of cognitive decline. This longitudinal study comprised 5454 individuals (aged 55–75 years in men and 60–75 years in women) who exhibited overweight/obesity and metabolic syndrome. Data on dietary vitamin D intake was assessed using a validated 143-item food frequency questionnaire. Cognitive function was assessed through five composite scores derived from a comprehensive battery of eight neuropsychological tests, encompassing global cognitive function, general cognitive function, attention, executive function, and language domains. Multivariable-adjusted linear regression models were fitted to examine the association between energy-adjusted cumulative average dietary vitamin D intake over time and 2-year changes in cognitive function. After adjusting for multiple covariates, energy-adjusted cumulative average dietary vitamin D intake as a continuous variable was associated with greater 2-year improvements in global cognitive function (β 1.18 × 10−2; 95% CI 0.19 × 10−2 to 2.17 × 10−2), executive function (β 1.12 × 10−2; 95% CI 0.03 × 10−2 to 2.21 × 10−2), and language (β 1.61 × 10−2; 95% CI 0.43 × 10−2 to 2.78 × 10−2). Additionally, the higher cumulative average dietary vitamin D intake quartile was associated with an increase in global cognitive function (β 7.10 × 10−2; 95% CI 0.59 × 10−2 to 13.6 × 10−2), language (β 7.07 × 10−2; 95% CI − 0.52 × 10−2 to 14.7 × 10−2), and a lower decline in attention (β 9.58 × 10−2; 95% CI 1.60 × 10−2 to 17.5 × 10−2). A higher dietary vitamin D intake was associated with modest favorable changes in cognitive function and a reduced cognitive decline over a 2-year period. These findings highlight the need for further research to explore the potential benefits of boosting dietary vitamin D intake for cognitive health in older adults.