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A 2011 review associated eating out with increased energy intake. Popular outlets, nutrient composition, and menus may have changed since 2011. This study aimed to investigate relative contributions of foods prepared outside of home to total energy, total and saturated fat, sugars, and sodium intakes. Studies were included if they were observational cohort or cross-sectional, investigated the contributions that foods prepared out of home made to energy, nutrient intakes and/or nutrient densities of adults aged 18–64 years, published between 2009 and 2019. Socio-demographic differences were explored. Data were extracted guided by the STROBE Statement for cohort and cross-sectional studies. A descriptive, qualitative synthesis was conducted. Study quality was assessed using the Joanna Briggs Institute Critical Appraisal Checklists for Analytical Cross-sectional and Cohort Studies. Evidence strength was assessed using GRADE. Twenty-six studies were included. Higher consumption of foods purchased outside home increased intakes of energy and nutrients of public health concern, particularly in males and younger adults. Heterogeneity of definitions of foods prepared outside of home made comparison difficult. Studies frequently used self-reported consumption data, prone to misreporting. Foods prepared outside of home are associated with poorer diets. Policy and practice initiatives are required to address this.

Contribution of foods prepared away from home to intakes of energy and nutrients of public health concern in adults: a systematic review