Gratitude is usually discussed as an emotional or psychological practice, but research increasingly links it to physical measures as well, including markers of cardiovascular health and immune function, suggesting the practice reaches further into the body than its purely mental reputation might initially suggest to a casual observer.
One proposed mechanism runs through stress: since gratitude appears to lower stress hormone activity, and chronic stress is itself linked to a wide range of physical health problems, a regular gratitude practice may work partly by reducing the physical wear that sustained stress otherwise places on the body over time.
None of this suggests gratitude can replace medical care, but it does suggest the old separation between mental and physical health understates how connected the two genuinely are, with a habit as simple as noticing what is going well carrying benefits that extend well past mood alone. It holds up best when treated as an ongoing practice rather than a single completed task.