Cited by 32Urban Green Space and HealthGut microbiota and healthOral microbiology and periodontitis research

Greenspace and human microbiota: a systematic review

Open access
Zhang, Yi-Dan, Zhou, Gang-Long, Wang, Lu, Browning, Matthew H.E.M., Markevych, Iana, Heinrich, Joachim, Knibbs, Luke D., Zhao, Tianyu +6 more·2024·Environment International

Abstract

BACKGROUND: Potential effect of greenspace exposure on human microbiota have been explored by a number of observational and interventional studies, but the results remained mixed. We comprehensively synthesized these studies by performing a systematic review following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. METHODS: Comprehensive literature searches in three international databases (PubMed, Embase, and Web of Science) and three Chinese databases (China National Knowledge Infrastructure, Wanfang, and China Biology Medicine disc) were conducted from inception to November 1, 2023. Observational and interventional studies that evaluated associations between greenspace exposure and human microbiota at different anatomical sites were included. Studies were assessed using the National Toxicology Program's office of Health Assessment and Translation risk of bias tool and certainty of evidence was assessed using the Grading of Recommendations, Assessment, Development and Evaluation framework. Two authors independently performed study selection, data extraction, and risk of bias assessment, and evidence grading. Study results were synthesized descriptively. RESULTS: Twenty studies, including 11 observational studies and 9 interventional studies, were finally included into the systematic review. The microbiota of the included studies was from gut (n = 13), skin (n = 10), oral cavity (n = 5), nasal cavity (n = 5) and eyes (n = 1). The majority of studies reported the associations of greenspace exposure with increased diversity (e.g., richness and Shannon index) and/or altered overall composition of human gut (n = 12) and skin microbiota (n = 8), with increases in the relative abundance of probiotics (e.g., Ruminococcaceae) and decreases in the relative abundance of pathogens (e.g., Streptococcus and Escherichia/Shigella). Due to limited number of studies, evidence concerning greenspace and oral, nasal, and ocular microbiota were still inconclusive. CONCLUSION: The current evidence suggests that greenspace exposure may diversify gut and skin microbiota and alter their composition to healthier profiles. These findings would be helpful in uncovering the potential mechanisms underlying greenspace and human health and in promoting a healthier profile of human microbiota.

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  • Lifestyle behaviors such as dietary habits, physical activity, and exposure to natural environments modulate the adult microbiome and thereby influence mental well-being.

    “In parallel, lifestyle behaviors such as dietary habits (Aslam et al., 2026), physical activity (Min et al., 2024), and exposure to natural environments (Zhang et al., 2024) act as powerful modulators of the adult microbiome, thereby influencing mental well-being.”

    From Psychobiotics in mental health: insights from human clinical trials via the gut-brain axis (2026) · cites this paper as Zhang et al., 2024

    The review reports associations between greenspace exposure and changes in human microbiota (Abstract, p. 1) and describes possible mechanisms (Section 4.3, pp. 14–15). It does not establish that those microbiota changes influence mental well-being; its proposed pathway instead runs from reduced psychological stress to altered gut microbiota. The Zhang citation attaches to natural-environment exposure, not the separately cited diet and physical-activity claims. (LLM, conf=0.86)

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  1. Hanski, I., von Hertzen, L., Fyhrquist, N., Koskinen, K., Torppa, K., Laatikainen, T., Karisola, P., Auvinen, P., Paulin, L., M ¨ akel ¨ a, M.J., Vartiainen, E., Kosunen, T.U., Alenius, H., Haahtela, T., 2012. Proc. Natl. Acad. Sci. U.S.A. 109, 8334 -8339. http://refhub.elsevier.com/S0160-4120(2400248-4/h0075)

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Authors
Zhang, Y.-D., Zhou, G.-L., Wang, L., Browning, M. H. E. M., Markevych, I., Heinrich, J., Knibbs, L. D., Zhao, T., Ding, Y., Chen, S., Liu, K.-K., Dadvand, P., Dong, G.-H., & Yang, B.-Y.
Affiliations
  • Sun Yat-sen University (CN)
  • Clemson University (US)
  • Jagiellonian University (PL)
  • The University of Melbourne (AU)
  • The University of Sydney (AU)
  • Helmholtz Munich (DE)
  • Texas A&M University (US)
  • Barcelona Institute for Global Health (ES)
Corresponding author
Yang, Bo-Yi
Venue
Environment International
Publisher
Elsevier BV
Published
2024-05
Volume
187
Pages
108662
ISSN
0160-4120 (ISSN-L)
OpenAlex
W4394858101
Cited by
32
References
45
Citations by year
2026: 14 · 2025: 15 · 2024: 3
FWCI
1.38
Type
journal article
Language
en
Open access
Locations
  • Environment International (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion, cc-by-nc-nd)
  • PuSH - Publication Server of Helmholtz Zentrum München (submittedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • Centres de Recerca de Catalunya (CEX2018-000806-S)
  • National Natural Science Foundation of China (81872582, 81972992)
  • Generalitat de Catalunya (CEX2018-000806-S)
  • Ministerio de Ciencia e Innovación (Centro de Excelencia Severo Ochoa 2019-2023, CEX2018-000806-S)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Urban Green Space and Health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Dentistry › Periodontics › Oral microbiology and periodontitis research
Keywords
green space exposure, human microbiota, gut microbiota, skin microbiome, oral microbiota, nasal microbiota, ocular microbiome, microbial diversity, probiotics, pathogenic bacteria, Ruminococcaceae, Streptococcus, Escherichia-Shigella
MeSH terms
Environmental Exposure, Humans, Microbiota

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