Urban Green Spaces’ Influence on Civilization Diseases—Meta-Analysis and Critical Review

This study investigates the influence of urban green spaces on the prevalence of overweight/obesity, diabetes, and hypertension. The search was run in the PUBMED database, using the search algorithm including combinations of keywords associated with the two concepts: civilization health problems and urban green spaces. A meta-analysis (for 48 studies) and critical review (for 26 studies) were performed. The meta-analysis results show that the presence, accessibility, and quality of green spaces are associated with the decreased prevalence of overweight/obesity (OR 0.86 (95% CI 0.77–0.95), p < 0.001, I2 99.7%), diabetes (OR 0.83 (95% CI 0.79–0.87), p < 0.001, I2 67.5%), and hypertension (OR 0.77 (95% CI 0.63–0.92), p < 0.001, I2 84.9%). In the children population, the influence of green spaces on overweight is unequivocal (OR 0.88 (95% CI 0.72–1.03), p < 0.001, I2 99.6%) and there is no influence on diabetes control. A green space’s direct influence on systolic or diastolic blood pressure is unequivocal. A green space is associated with a decreased prevalence of civilization diseases. Its positive influence, however, is not so strong in children. The short-term influence of green spaces on blood pressure (e.g., taken as a proxy for mental stress) is unequivocal.