Immune system and health from a clinical psychoneuroimmunology perspective

The immune system plays a central role in regulating health and the body's ability to adapt. Clinical psychoneuroimmunology allows us to understand in an integrated way how factors such as stress, sleep, diet and emotional states influence the immune response over time, framing the immune system as part of an interdependent physiological network.

The immune system is one of the body's main regulatory systems, taking part in defence against external agents, cellular surveillance and maintaining physiological balance. Clinical Psychoneuroimmunology (CNIP) studies the interaction between the nervous system, the endocrine system and the immune system in an integrated way, allowing us to understand how biological, emotional and behavioural factors influence the immune response over time.

This perspective sees the immune system not as an isolated system, but as part of a functional network in continuous communication with other regulatory systems in the body, sensitive to internal and external conditions.

The immune system as an adaptive system

The functioning of the immune system is dynamic and adaptive. Its response continually adjusts to the demands of the internal and external environment, varying according to factors such as metabolic state, emotional context, level of physical activity, etc. stress and biological rhythms.

More than just the ability to respond to pathogens, immune effectiveness depends on appropriate regulation mechanisms, including inflammation control, immunological tolerance and efficient communication with the nervous and endocrine systems. Research into healthy ageing and chronic diseases has associated a well-regulated immune response with less low-grade inflammation and better adaptive capacity throughout life.

Functional organisation of the immune system

From a functional point of view, the immune system is organised on several interdependent levels. Physical and chemical barriers, such as the skin, mucous membranes and gastric acid environment, are the first line of defence. The innate immune system ensures rapid and non-specific responses to stimuli from stress biological. The adaptive immune system involves more specific responses, mediated by lymphocytes, with immunological memory capacity.

The regulation of these responses depends on fine control mechanisms, in which regulatory cells play an essential role, preventing excessive or maladjusted responses that could jeopardise physiological balance.

Stress, neuroendocrine axis and immunomodulation

O stress Prolonged stress exerts a significant influence on the immune system through persistent activation of the hypothalamic-pituitary-adrenal axis. The continuous release of neuroendocrine mediators such as cortisol is associated with immunomodulatory effects that can interfere with cellular surveillance, the inflammatory response and the body's ability to adapt.

Clinical Psychoneuroimmunology highlights the importance of emotional regulation and the autonomic nervous system in modulating the immune response, recognising that emotions, threat perception and the psychosocial context directly influence physiological defence mechanisms.

Sleep and immune regulation

Sleep plays a decisive role in immune regulation. During the night, fundamental cell repair processes take place, as well as the release of cytokines involved in the inflammatory response and the coordination of the immune response.

Alterations in the duration or quality of sleep have been associated with changes in the immune response, greater susceptibility to infections and a lower capacity for physiological recovery, reflecting the importance of biological rhythms in regulating defence systems.

Physical exercise and the immune response

Regular moderate physical exercise has been associated with favourable effects on immune regulation. Movement facilitates the mobilisation of immune cells, influences the low-grade inflammatory response and contributes to communication between the nervous, endocrine and immune systems.

These effects frame exercise as a relevant modulator of the immune response and the body's adaptive capacity, particularly when integrated into a global context of physiological regulation.

Nutrition, immune barriers and microbiota

The integrity of immune barriers and the effectiveness of the immune response can be influenced by nutritional status. Scientific literature has associated dietary patterns rich in ultra-processed foods with changes in intestinal permeability, disruption of the microbiota and increased systemic inflammation, factors that can interfere with immune regulation mechanisms.

On the other hand, dietary patterns based on natural foods, rich in fibre, unsaturated fats and essential micronutrients, have been associated with better function of the intestinal microbiota and more effective modulation of the immune response. Considering that a significant part of the immune system's activity occurs at the intestinal level, the gut-immune system axis is of particular clinical importance in understanding the body's defence and adaptation processes.

Some micronutrients can fulfil specific functions in this context. Vitamin D has been associated with modulating inflammation and lymphocyte function, while vitamin A is involved in cell differentiation and maintaining mucosal integrity. Deficit states of these micronutrients may be associated with alterations in the immune response and inflammatory regulation mechanisms.

The nutritional approach must always be framed within the individual clinical context, taking into account the state of health, specific needs and characteristics of each person, and integrated into an overall assessment adjusted to the specific case.

Factors that can influence immune regulation

Research in Clinical Psychoneuroimmunology identifies several factors that, when persistent, can influence the regulation of the immune system, including:

• Stress prolonged psychosocial
• Insufficient or fragmented sleep patterns
• Sedentary lifestyle
• Excess adipose tissue
• Unbalanced diet
• Changes in digestive function

These factors tend to converge in increased low-grade inflammation and altered communication between the nervous, endocrine and immune systems.

Understanding the immune system from an integrative perspective

Clinical Psychoneuroimmunology sees the immune system as part of a network of interdependent systems, in continuous communication with the nervous system and the endocrine system. From this perspective, the immune response is understood as a dynamic process, influenced by nutritional, emotional, behavioural and environmental factors, reflecting the organism's adaptive capacity to meet the demands of the context.

Integrated clinical assessment makes it possible to analyse how these different factors condition immune regulation over time, taking into account neuroendocrine mechanisms, inflammatory processes and the dynamics of the immune response. States of functional imbalance are thus understood as sustained physiological responses to internal and external stimuli, and not as isolated events or independent of the global context.

In Integrative Osteopathy consultations, this perspective translates into an assessment that integrates the overall functioning of the body, lifestyle habits, sleep patterns, energy levels and stress and the role of the immune system in physiological adaptation processes. The aim is to support the natural mechanisms of regulation and adaptation, while respecting the uniqueness of each person and the complexity of the systems involved.