A nature lifestyle promotes exposure to diverse environmental microbiomes. The "Old Friends" hypothesis suggests that reduced exposure to microorganisms found in soil and vegetation contributes to the rise of autoimmune diseases and allergies. Outdoor lifestyles naturally facilitate this exposure, potentially strengthening immune system resilience.

3 ways getting outside into nature helps improve your health

: Examines how older adults adapt their outdoor lifestyles to maintain well-being despite physical aging. Core Lifestyle Concepts Outdoor life, nature experience, and sports in Norway