The Earth Mart intervention leverages gardening exposure as a scalable behavioral health mechanism that simultaneously improves nutrition, physical activity, and psychosocial wellbeing. These combined effects target root causes of chronic disease and are expected to produce measurable Medicare Fee-For-Service savings exceeding program implementation costs.
Self-Determination Theory
Participants develop intrinsic motivation through:
- Autonomy: choosing foods grown and prepared within the program
- Competence: acquiring gardening, cooking, and preservation skills
- Relatedness: shared participation with family and community members
Intrinsic motivation has been shown to predict long-term adherence to dietary and lifestyle behaviors beyond externally directed interventions.
Social Cognitive Theory
Behavior change occurs through:
- observational learning,
- peer modeling,
- reinforcement through visible outcomes (plant growth, harvest).
Participants repeatedly observe positive health behaviors modeled within a community setting, increasing perceived self-efficacy.
Social Cognitive Theory
Behavior change occurs through:
- observational learning,
- peer modeling,
- reinforcement through visible outcomes (plant growth, harvest).
Participants repeatedly observe positive health behaviors modeled within a community setting, increasing perceived self-efficacy.
Stress Regulation
Nature exposure reduces activation of the hypothalamic-pituitary-adrenal (HPA) axis, resulting in:
- lower cortisol levels,
- reduced systemic inflammation,
- improved metabolic regulation.
Chronic cortisol elevation is strongly associated with obesity, diabetes, hypertension, and depression.
Autonomic Nervous System Balance
Gardening activities promote parasympathetic nervous system activation (“rest-and-digest” state), leading to:
- reduced heart rate,
- improved blood pressure regulation,
- enhanced insulin sensitivity.
Neurochemical Effects
Research demonstrates nature engagement increases:
- serotonin regulation,
- dopamine reward signaling,
- endorphin release associated with moderate physical activity.
These mechanisms improve mood and reduce anxiety and depressive symptoms linked to chronic disease progression.
Immune System Effects
Soil microbial exposure has been associated with improved immune regulation and decreased inflammatory markers, potentially reducing chronic inflammatory disease burden.
| Barrier Addressed | Earth Mart Intervention Component | Expected Outcome | |
|---|---|---|---|
| Food Access | Limited affordable healthy foods | Local food production & distribution | Increased nutrition quality |
| Economic Stability | High grocery costs | Low-cost locally grown food | Reduced financial stress |
| Education & Health Literacy | Limited nutrition knowledge | Hands-on cooking & gardening education | Improved self-management |
| Social & Community Context | Isolation among families & seniors | Intergenerational participation | Improved mental wellbeing |
| Neighborhood Environment | Limited green space engagement | Community garden infrastructure | Increased physical activity |
| Healthcare Access | Preventive care gaps | Community-based prevention model | Reduced acute utilization |