The impact of exposure to green or bluespace on dietary intake and food choices among adults—A systematic literature review

Extensive research has shown that spending time in natural greenspaces has a positive impact on health. However, there is limited evidence regarding potential factors that may influence these effects. This review aimed to assess the strength of the evidence and potential impact of exposure to green and bluespaces on dietary outcomes in adults. Inclusion criteria for the review were based on the PICO criteria. Following PRISMA guidelines, an initial search of five databases was conducted: CINAHL, GreenFILE, AMED, Medline, and PubMed, accessed on 14th June 2021 and augmented by an updated rerun in January 2024. All studies used the Joanna Briggs Institute (JBI) Critical Appraisal Checklist for Analytical Cross-Sectional Studies for quality assessment. Due to heterogeneity, a narrative synthesis was conducted to evaluate the relationships between the included studies. Four observational studies that reported diet-related outcomes were included in the review, and participants within the studies ranged from 554 to >350,000 participants. Other health outcomes, including physical activity and obesity, were also reported. Two studies found that dietary patterns were not correlated with exposure to greenspace. Due to the small number of articles retrieved and the paucity of evidence, the findings must be interpreted cautiously. In conclusion, further research is essential to clarify the intricate mechanisms involved in greenspace-related health benefits. Additionally, investigating the specific greenspace attributes influencing adult dietary intake and food choices is warranted. When devising public health interventions, it is crucial to account for the substantial health advantages associated with various socioeconomic groups.