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Time to read 5 min
The mind, nervous system, and Immune System are biologically inseparable: immune cells respond to stress hormones, and nerve fibers are in direct contact with immune organs – the body functions as an interconnected system.
Short-term Stress makes biological sense; it only becomes problematic when it turns chronic – at that point, the Immune System shifts its priorities away from long-term stability toward short-term survival.
The vagus nerve plays a key role as the link between the brain, gut, and Immune System: A constant state of alarm in the nervous system keeps the Immune System needlessly activated and prevents Regeneration.
The Immune System does not respond to individual stressors but to recurring lifestyle patterns – sleep rhythm, exercise, social contact, and recovery phases determine immune balance in the long run.
Health does not arise from permanent activation but from the ability to switch between activity and recovery – a regulated nervous system is the prerequisite for a regulated Immune System.
How Thoughts, the Nervous System, and the Immune System Are Connected
For a long time, the Immune System was understood as a largely independent defense system. The body fights pathogens. The brain thinks. The mind feels. Today we know that this separation does not exist biologically.
Our Immune System is in constant exchange with the brain, nervous system, and emotional perception. This interplay is described by a field of research with an initially complicated-sounding name: Psychoneuroimmunology.
THE CHANGE® Immune Series
The term connects three central systems of the human organism:
The central insight is: Our lifestyle, our stress load and our inner state measurably influence the function of the immune system. This is not a philosophical assumption but is well documented biologically.
Immune cells have receptors for stress hormones. Nerve fibres are in direct contact with immune organs. Inflammatory messenger substances in turn influence mood, energy and behaviour. The body does not work in isolated parts — it functions as an interconnected system.
Stress is often judged exclusively negatively. Yet stress is initially a meaningful adaptive reaction. In the short term it heightens attention, reaction speed and energy availability. Immunological activity can also rise briefly — biologically logical, because the body switches to "readiness".
Stress only becomes problematic when it no longer ends.
Permanent activation of the stress system alters immune regulation. Elevated stress hormones such as cortisol influence, among other things:
In the process, the Immune System shifts its priorities. Short-term survival becomes more important than long-term stability. This makes biological sense in exceptional situations — but over the long term it becomes a burden.
A central key is the autonomic nervous system. Particularly important is the vagus nerve, which connects the brain, heart, gut, and Immune System. Among other things, it influences inflammation regulation, heart rate, digestive activity, and the capacity for recovery.
If the nervous system is in a constant state of alarm, the Immune System also remains more easily activated. However, Regeneration only occurs where safety is signaled.
An important insight of psychoneuroimmunology is surprisingly simple: the Immune System responds less to individual stressors than to recurring lifestyle patterns. It is not one stressful day that determines health, but lasting habits.
Small factors add up: sleep rhythm, social interaction, movement, exposure to light, mental strain and recovery phases. Health arises from regularity.
The practical consequence is less complicated than often assumed:
A large part of modern immune strain is caused not by pathogens but by persistent stress signals. A regulated nervous system supports a regulated Immune System. Health arises less from permanent activation than from the ability to switch between activity and recovery.
Can Stress Affect the Immune System?
Yes. Chronic stress alters hormonal signalling pathways and can influence immune responses over the long term.
What is the gut-brain axis?
A bidirectional connection between the nervous system, gut, and Immune System via nerves and messenger substances.
Why Is Sleep Important for the Immune System?
During sleep, immune cells are regulated and inflammatory processes are coordinated.
Does Relaxation Help the Immune System?
Regeneration of the nervous system also supports immune balance.
THE CHANGE® Immune Series
Sven Altorfer
Sven Altorfer is Head of Research and Development at Swiss Health Nutrition AG. With his expertise in nutrition and bioactive substances, he advocates natural health approaches to promote preventive measures and the body's self-healing capacities.
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