People who engage in regular physical activity have a slightly lower risk of developing rheumatoid arthritis due to high physiological stress and a slightly lower risk of death if they have asthma...
Mechanism
Synthesis from 1 study
Moving regularly reduces the body's stress signals, which lets the immune system stop overreacting and return to normal function. This lowers the chance of autoimmune damage and death from stress-related diseases like rheumatoid arthritis and severe asthma.
Most probable mechanism
Regular movement reduces the body's stress signals, which allows the immune system to stop overreacting and return to normal function, lowering the chance of autoimmune damage and death from stress-related diseases.
Chronic stress causes sustained activation of the hypothalamic-pituitary-adrenal axis and sympathetic nervous system, leading to elevated levels of stress hormones and persistent sympathetic signaling.
Sustained stress hormone exposure reduces glucocorticoid receptor sensitivity in immune cells, impairing the body's ability to shut down inflammation.
Impaired glucocorticoid signaling permits continuous production of pro-inflammatory cytokines such as IL-6 and TNF-α, and promotes expansion of pathogenic T-cell populations.
Regular physical activity increases parasympathetic tone and triggers the release of anti-inflammatory myokines from skeletal muscle, including IL-6, IL-10, and IL-1ra.
Myokines and enhanced vagal activity restore glucocorticoid receptor sensitivity and reestablish HPA-axis feedback control, suppressing systemic inflammation.
Reduced inflammation and restored immune regulation lower the activation threshold for autoimmune responses in target tissues such as joints and airways, decreasing disease incidence and mortality.
Less supported by current evidence, but not ruled out
High intake of omega-3 fats replaces inflammatory fats in cell membranes and produces molecules that actively stop inflammation, reducing immune damage caused by chronic stress.
Omega-3 fatty acids incorporate into immune and endothelial cell membranes, displacing arachidonic acid.
This substitution reduces the production of pro-inflammatory eicosanoids derived from arachidonic acid.
Omega-3 fatty acids are metabolized into specialized pro-resolving mediators such as resolvins and protectins.
These mediators actively terminate inflammation, promote tissue repair, and reduce autoimmune activation in target organs.
People with inherited immune risks experience stronger inflammatory responses under stress because stress changes how their immune genes are turned on and off.
Individuals carry genetic variants that predispose immune cells to heightened reactivity or impaired regulation.
Chronic stress induces epigenetic modifications such as DNA methylation and histone acetylation in immune cells.
These modifications activate pro-inflammatory gene networks specifically in genetically susceptible individuals.
Epigenetic reprogramming lowers the threshold for immune cell activation, leading to exaggerated cytokine release and loss of self-tolerance.
Amplified immune activation accelerates autoimmune destruction in target tissues, increasing disease incidence and severity.
Evidence from Studies
Supporting (1)
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Contradicting (0)
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