Abstract The adoption of sustainable diets among middle-aged and older adults may lead to both improved health outcomes and lower environmental impact. Understanding the barriers and enablers that influence food choices and dietary patterns in this growing demographic is pivotal to inform the promotion of dietary change. A convergent integrated mixed methods systematic review was conducted using the Joanna Briggs Institute methodology. Four databases (MEDLINE, CINAHL, Scopus and PsychInfo) were searched for studies published from January 2009 to February 2024 that identified the perceptions of participants 45 years and older in high-income countries about sustainable food choices and barriers and enablers to consumption. From 6295 studies, 23 studies were included and critically appraised using the Mixed Methods Appraisal Tool. Findings were integrated in a narrative review. Key enablers included the following: understanding of environmental impacts of food; nutritional benefits of plant products; nutrition knowledge and awareness of the health and environmental concerns around some animal food sources. Key barriers included the following: cost of eating a sustainable diet; preference for taste of animal foods like meat and high accessibility; inconvenience of preparation; concerns around nutritional adequacy of plant foods versus animal foods; sociocultural influences and lack of familiarity about sustainability and diet. These findings provide insight into public perceptions of over 45 year olds and may be used by public health practitioners in education and nutrition promotion efforts to motivate people to overcome barriers, such as lack of knowledge, accessibility and food preparation skills as highlighted by this review. Other forms of research into policy and regulatory functions may be needed to further inform strategies to modify dietary patterns.
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