Background: We investigated the association of dietary patterns and sleep duration by controlling mental health status (MHS) using a joint modeling approach.Methods and materials: The population based cohort study was conducted within the framework of the Isfahan Cohort Study (ICS), including 1383 participants, aged ≥ 35 years were followed from 2007 to 2013. A validated food frequency questionnaire was applied to obtain dietary patterns. Anthropometric measurements, blood pressure, fasting

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... m lipids and blood sugars were evaluated in both phases of the study. A random effect joint negative binomial and ordinal model were used to estimate diets effect on sleep duration and MHS.Results: Three dietary patterns were identified: Healthy, Iranian and Western dietary patterns. After adjustment for potential confounders, the higher scores of Western diet were associated with sleep hours (OR=1.08 and 95% CI: 1.02‒1.12), the higher scores of the Western diet during the 5 year follow-up was associated with greater sleep duration. Sleep duration and MHS were adversely associated (-0.097 and 95% CI: -0.09‒-0.05)Conclusion: Joint modeling by MHS, sleep duration was positively affected only by western diet. Iranian and healthy diet weren't associated by sleep hours.