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Background An innate preference for later timing of sleep and activity, termed evening chronotype, is linked to poorer cardiovascular health (CVH). However, associations of chronotype with specific health behaviors in US women are not well characterized. Of particular interest is habitual diet, because &amp;lt;1% of US adults meet recommendations for a healthful diet. Objectives We aimed to evaluate cross-sectional and prospective associations of chronotype with diet quantity and quality in US women, and to assess whether dietary energy density (ED), a robust predictor of cardiometabolic outcomes, mediates an established chronotype-CVH relation. Methods Data were collected from participants in the AHA Go Red for Women Strategically Focused Research Network cohort (aged 20–76 y; 61% racial/ethnic minority) at baseline (n = 487) and 1-y follow-up (n = 432). Chronotype (evening compared with morning/intermediate) and habitual diet were ascertained from the Morningness-Eveningness Questionnaire and an FFQ, respectively. Multivariable-adjusted linear regression models evaluated cross-sectional and prospective associations of chronotype with diet. Causal mediation analyses assessed whether dietary ED mediated a relation between chronotype and CVH, quantified using AHA Life's Simple 7 score, derived from clinical measurements and validated assessments of CVH components. Results Evening compared with morning/intermediate chronotype was associated with poorer diet quality, including lower intakes of plant protein (cross-sectional: β = −0.63 ± 0.24, P &amp;lt; 0.01; prospective: β = −0.62 ± 0.26, P = 0.01), fiber (cross-sectional: β = −2.19 ± 0.65, P &amp;lt; 0.001; prospective: β = −2.39 ± 0.66, P &amp;lt; 0.001), and fruits and vegetables (cross-sectional: β = −1.24 ± 0.33, P &amp;lt; 0.001; prospective: β = −1.15 ± 0.36, P = 0.001). Evening chronotype was also associated with higher dietary ED at baseline (β = 0.20 ± 0.05, P = 0.001) and 1 y (β = 0.19 ± 0.06, P = 0.001). Dietary ED was a partial mediator of the association between evening chronotype and poorer CVH (24.6 ± 9.1%, P &amp;lt; 0.01). Conclusions Evening chronotype could contribute to unhealthful dietary patterns in US women, with higher dietary ED partially mediating the relation between eveningness and poorer CVH. Behavioral interventions to reduce dietary ED might mitigate cardiovascular disease risk in women with evening chronotype.

the journal of nutrition/the journal of nutrition

Evening Chronotype Is Associated with Poorer Habitual Diet in US Women, with Dietary Energy Density Mediating a Relation of Chronotype with Cardiovascular Health